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Polyhedron 27, issue 1, 20 Jaunary 2008 www.elsevier.com/locate/poly
Contents Papers Jose´ S. Casas, Eduardo E. Castellano, Javier Ellena, Marı´a S. Garcı´a-Tasende, Agustı´n Sa´nchez, Jose´ Sordo and ´ ngeles Touceda A Polyhedron 27 (2008) 1
New diphenyllead(IV) complexes have been synthesized and characterized by X-ray crystallography. Analysis of the Pb–S, Pb–N and Pb–O bond distances in these complexes suggests a borderline Lewis acid character for the diphenyllead(IV) cation.
New insights on the Lewis acidity of diorganolead(IV) compounds: Diphenyllead(IV) complexes with N,O,S-chelating ligands
Guan-Cheng Xu, Li Zhang, Lang Liu, Guang-Fei Liu and Dian-Zeng Jia Polyhedron 27 (2008) 12 Syntheses, characterization and crystal structures of mixed-ligand Cu(II), Ni(II) and Mn(II) complexes of N-(1-phenyl-3-methyl-4propenylidene-5-pyrazolone)-salicylidene hydrazide containing ethanol or pyridine as a co-ligand
Five mixed-ligand complexes of Cu(II), Ni(II) and Mn(II) have been synthesized and characterized. The results show that the ligand undergoes isomerization in the reaction and acts as a double negatively charged tridentate chelating agent coordinated to the metal ion, other coordination sites of metal ions were completed either by the ethanol or pyridine molecules.
HC
HC
HC
HO
O
NH
OH
N
Crystallographic and thermal investigations of organic ammonium tetrathiomolybdates
Elsevier Ltd.
OH
N
HC
HC HO
HC N
O
HO HC
NH
C
O
N
C N
C
keto form (III)
Polyhedron 27 (2008) 25
O
N
O
N H
The structures of N-methylethylenediammonium tetrathiomolybdate, N-(3-aminopropyl)propane-1,3-diaminium tetrathiomolybdate, 4-(2-ammonioethyl)piperazin-1-ium tetrathiomolybdate hemihydrate consist of tetrahedral tetrathiomolybdate anions which are linked to the organic ammonium cations with the aid of weak hydrogen bonding interactions. A comparative study of the structural features of 28 tetrathiomolybdates is described.
C
N
enol form (I)
N
Bikshandarkoil R. Srinivasan, Sunder N. Dhuri, Ashish R. Naik, Christian Na¨ther and Wolfgang Bensch
HO NH
C
C
+ HN
N
HC
N N
OH
C OH
enol form (II)
vi
Leji Latheef and Maliyeckal R. Prathapachandra Kurup Polyhedron 27 (2008) 35 Spectral and structural studies of nickel(II) complexes of salicylaldehyde 3-azacyclothiosemicarbazones Four nickel(II) complexes of salicylaldehyde N(4)-hexamethyleneiminyl thiosemicarbazone (H2L1) and two nickel(II) complexes of salicylaldehyde N(4)-pyrrolidine thiosemicarbazone (H2L2) have been synthesized and
Akella Sivaramakrishna, Banothile C.E. Makhubela, Feng Zheng, Hong Su, Gregory S. Smith and John R. Moss Polyhedron 27 (2008) 44 Synthesis, structure and reactivity of cis[PtL2(1-alkenyl)2] complexes
Lincoln Lucilio Romualdo, Andre´ Luis Bogado, Eliana M.A. Valle, Icaro S. Moreira, Javier Ellena, Eduardo E. Castellano, Ma´rcio P. de Araujo and Alzir A. Batista Polyhedron 27 (2008) 53 Novel manganese (III) porphyrin containing peripheral ‘‘[RuCl(dppb)(X-bipy)]+’’ cations [dppb = 1,4-bis(diphenylphosphino)butane and X = –CH3, –OMe, –Cl]. X-ray structure of the cis-[RuCl(dppb)(bipy)(4-Mepy)]PF6 complex
Ana C.D. Mido˜es, Pedro E. Aranha, Mirian P. dos Santos, E´rica Tozzo, Sandra Romera, Regina H. de A. Santos and Edward R. Dockal Polyhedron 27 (2008) 59 Synthesis, characterization, crystal structure and catalytic property of [Cu(SalAHE)2] (SalAHE = salicylaldehydeimine-1-hydroxyethane) complex for the oxidation of 3,5-ditert-butylcatechol
Contents
characterized by different physicochemical techniques. The complexes were given the formulae [Ni(HL2)2] (1), [NiL2py] (2), [NiL2apic] (3), [NiL2c-pic] Æ H2O (4), [NiL4py] (5) and [NiL4c-pic] (6). In complex 1, the ligand moieties are coordinated as monoanionic (HL)). The other complexes posses the stoichiometry NiLB, where B represents different bases, viz. pyridine and a/b/c-picoline. The coordination geometry around nickel(II) in 2 and 3 is found to be distorted square planar in geometry with coordination of azomethine nitrogen, thiolato sulfur, phenolato oxygen and pyridyl nitrogen atoms.
The synthesis and characterization of several new bis(1-alkenyl)platinum(II) complexes have been carried out. The insertion of carbon monoxide into the metal–carbon bonds of the platinum alkenyl complexes and other reactions including transmetalation, intermolecular alkenyl migrations, and oxidative addition of methyl iodide are also described. The thermal decomposition studies of the bis(alkenyl) complexes are also reported.
New tetraruthenated manganese (III) porphyrins were synthesized and characterized (31P NMR, cyclic voltammetry, UV–Vis). This new system presents four units of cationic ‘‘[RuCl(dppb)(X-bipy)]+’’. The electrochemical and catalytic properties of the central manganese (III) show dependence on the characteristics of the peripheral ruthenium complexes as evidenced by the Mn(III)/Mn(II) reduction potential.
A new Schiff base copper(II) complex [Cu(SalAHE)2] was synthesized and characterized. The crystal structure of this complex shows that it is almost coplanar with the two ligands in the trans configuration. This complex with a simple structure is able to oxidize 3,5-di-tertbutylcatechol to the respective o-quinone with molecular oxygen.
Contents
Edwin C. Constable, Catherine E. Housecroft, Markus Neuburger, Silvia Schaffner and Ellen J. Shardlow Polyhedron 27 (2008) 65
The synthesis and characterization of R3PAu(1–H) (R = nBu, Ph) and (1–H)Au(l-dppe)Au(1–H) (1 = HCBCCH2Otpy, tpy = 2,20 :60 ,200 -terpyridine) are reported.
Gold(I) phosphine-decorated 2,20 :60 ,200 -terpyridine ligands
M. Akbar Ali, Hjh Junaidah Hj Abu Bakar, A.H. Mirza, S.J. Smith, L.R. Gahan and Paul V. Bernhardt Polyhedron 27 (2008) 71 Preparation, spectroscopic characterization and X-ray crystal and molecular structures of nickel(II), copper(II) and zinc(II) complexes of the Schiff base formed from isatin and Smethyldithiocarbazate (Hisa-sme)
P. Chandrasekaran, Joel T. Mague and Maravanji S. Balakrishna Polyhedron 27 (2008) 80 Synthesis and characterization of RuII/AuI, PdII/AuI, PdII/2AuI, PtII/2AuI and CuI/2AuI heterometallic complexes of cyclodiphosphazane cis-{(o-MeOC6H4O)P(l-NtBu)}2
Qing-Xiang Liu, Li-Na Yin, Xiu-Mei Wu, Jin-Cheng Feng, Jian-Hua Guo and Hai-Bin Song Polyhedron 27 (2008) 87 New N-heterocyclic carbene mercury(II) and silver(I) complexes
X-ray crystallographic structure determination of the [Ni(isasme)2] Æ MeCN complex (isasme = monoanionic) form of the Schiff base formed by condensation of isatin with S-methyldithiocarbazate reveals a six-coordinate, distorted octahedral. Structure By contrast, [Zn(isasme)2] Æ MeOH is four-coordinate and has a distorted tetrahedral geometry. The structure of the copper(II) complex [Cu(isa-sme)2] Æ DMSO is complicated and comprises two different complexes in the asymmetric unit, one four- and the other fivecoordinate.
Selective monodentate coordination of the cyclodiphosphazane, cis-{(o-MeOC6H4O)P(l-NtBu)}2 with metal precursors such as [RuCl2(g6-cymene)]2, [PdCl2(PEt3)]2 and [MCl2(COD)] (M = Pd, Pt) and bridging bidentate coordination with [AuCl(SMe2)] gives facile synthetic approach for RuII/AuI, PdII/AuI, PdII/2AuI, PtII/2AuI and CuI/2AuI heterometallic complexes.
The complexes [1-(9-anthracenylmethyl)-3octylimy]2Hg[HgCl4] (2a) (imy = imidazol-2ylidene) and [1-(9-anthracenylmethyl)-3butylbimy]2AgPF6 (2b) (bimy = benzimidazol2-ylidene) have been prepared and characterized. Crystal packing of complex 2a revealed that 1D polymeric chains are formed by [1-(9-anthracenylmethyl)-3-octylimy]Hg and [HgCl4]2) through weak Hg…Cl bonds. The packing diagram of 2b showed that 1D supramolecular chains are formed by both benzimidazole ring head to tail p–p stacking interactions and anthracene ring face-to-face p–p stacking interactions.
vii
viii
Contents
Harri Sopo, Ari Lehtonen and Reijo Sillanpa¨a¨ Polyhedron 27 (2008) 95 Uranyl(VI) complexes of [O,N,O,N0 ]-type diaminobis(phenolate) ligands: Syntheses, structures and extraction studies The reaction between uranyl nitrate hexahydrate and phenolic ligand precursors N,N-bis(2-hydroxy-3,5-dialkylbenzyl)-N0 ,N0 -dimethylethylenediamine (alkyl = methyl or
Somnath Roy, Tarak Nath Mandal, Anil Kumar Barik, Samik Gupta, Ray J. Butcher, Mohamed Salah El Fallah, Javier Tercero and Susanta Kumar Kar Polyhedron 27 (2008) 105 A pyrazole-based orthogonal ferromagnetically coupled [2 · 2] homoleptic square Cu4 grid: Magnetostructural correlations
O.O.E. Onawumi, O.O.P. Faboya, O.A. Odunola, T.K. Prasad and M.V. Rajasekharan Polyhedron 27 (2008) 113 Synthesis, structure and spectral studies on mixed ligand copper(II) complexes of diimines and acetylacetonate
Andrea Lakatos, Tama´s Kiss, Roberta Bertani, Alfonso Venzo and Valerio B. Di Marco Polyhedron 27 (2008) 118 Complexes of Al(III) with
D -gluconic
acid
t-butyl) (H2L1, H2L2) in a 1:2 molar ratio (M to L) in acetonitrile afford a uranyl complex of the form [UO2(HLn)(NO3)] Æ xCH3CN (n = 1, x = 1 and n = 2, x = 2) whereas H2L1 and N-(2-pyridylmethyl)-N,N-bis(2-hydroxy-3,5-dimethylbenzyl)amine (H2L3) in the presence of a base (triethylamine) afford the mononuclear, neutral uranyl complexes [UO2(HLn)2] Æ xCH3CN (n = 1, x = 0 and n = 3, x = 2). Extraction studies of the uranyl ion from water to dichloromethane with these ligands are also presented.
Strategic and systematic positioning of polyfunctional groups within the backbone of a pyrazole derived ditopic ligand (PzOAPyz) leads to the formation of an aesthetically looking sophisticated supramolecular self-assembled homoleptic Cu4(l-O4) square grid which exhibits intramolecular ferromagnetic exchange with an S = 2 magnetic ground state.
The simplest member of the CASIOPEINAS family of cytotoxic and antineoplastic compounds, [Cu(acac)(bpy)(H2O)]NO3 is prepared and characterized. The Cu(II) complex ion has a distorted square pyramidal coordination in the solid state and presumably also in solution.
+
OH2 N
O
Cu N
The complexation of Al(III) with D -gluconic acid has been studied in solution by pHpotentiometry, ESI mass spectrometry and one- and two-dimensional NMR spectroscopy. A solid complex [AlL2H)1] Æ 2H2O was isolated as a microcrystalline powder and characterized. The structures of the complexes are discussed on the basis of spectroscopic results and MM force field calculations.
O
Contents
Ismail Yilmaz, Hamdi Temel and Hu¨seyin Alp Polyhedron 27 (2008) 125 Synthesis, electrochemistry and in situ spectroelectrochemistry of a new Co(III) thio Schiffbase complex with N,N0 -bis(2-aminothiophenol)-1,4-bis(carboxylidene phenoxy)butane
George Psomas, Alketa Tarushi and Eleni K. Efthimiadou Polyhedron 27 (2008) 133 Synthesis, characterization and DNA-binding of the mononuclear dioxouranium(VI) complex with ciprofloxacin
Moutusi Dasgupta, Sumon Nag, Gopal Das, Munirathinam Nethaji and Samaresh Bhattacharya Polyhedron 27 (2008) 139 N,N0 -Bis(aryl)pyridine-2,6-dicarboxamide complexes of ruthenium: Synthesis, structure and redox properties
Matthias Linnert, Clemens Bruhn, Harry Schmidt, Renate Herzog and Dirk Steinborn Polyhedron 27 (2008) 151 Synthesis, structure and characterization of [Mg7(l3-OCH2CH2OMe)6(l-OCH2CH2OMe)6][Al(n-Bu)4]2 – A cationic heptanuclear magnesium complex consisting of discrete cations and tetrabutylaluminate anions
ix
A new cobalt Schiff-base complex, [Co(L)(OH)(H2O)] (where L = [N,N0 -bis(2-aminothiophenol)-1,4-bis(carboxylidene phenoxy)butane), was synthesized and its electrochemical and spectroelectrochemical properties were investigated using cyclic voltammetry (CV), differential pulse voltammetry (DPV) and thin-layer spectro-electrochemistry in solutions of dimethyl sulfoxide (DMSO) and dichloromethane (CH2Cl2).
The synthesis, characterization and interaction with calf-thymus DNA of the neutral mononuclear dioxouranium(VI) complex with the second-generation quinolone antibacterial agent ciprofloxacin are presented.
Reaction of five N,N0 -bis(aryl)pyridine-2,6-dicarboxamides (1) with [Ru(trpy)Cl3](trpy = 2,20 ,200 -terpyridine) in refluxing ethanol in the presence of triethylamine afforded a group of complexes of the type [RuII(trpy)(L-R)] (2, n = 0), which upon constant potential coulometric oxidation produced the corresponding [RuIII(trpy)(L-R)]+ complexes (2, n = 1), which have been isolated as the perchlorate salts.
Crystals of the title complex were found to consist of discrete heptanuclear magnesium complex cations built up from seven edgeshared MgO6 octahedra (I) and [Al(n-Bu)4]) anions (II). 1H, 13C and 27Al NMR spectroscopic measurements showed that in THF solution the structures both of the cations and anions are preserved and that there are no cation–anion interactions reducing their symmetry (dAl = 151.6, w1/2 = 5 Hz; 1J(27Al,13C) = 72.3 Hz).
n+ O
O
N N
O NH
N
O
N
Ru
R
HN
R N
R
R
N N
R= OCH3, CH3, H, Cl, NO2
1
I
2
II
x
K. Naresh Kumar, G. Venkatachalam, R. Ramesh and Y. Liu Polyhedron 27 (2008) 157 Half-sandwich para-cymene ruthenium(II) naphthylazophenolato complexes: Synthesis, molecular structure, light emission, redox behavior and catalytic oxidation properties
Vladimir B. Golovko, Martin J. Mays and Gregory A. Solan Polyhedron 27 (2008) 167 Self-cyclisation versus diynediol-promoted ring closure during the construction of coordinated crown-type macrocycles
M. Mamais, P.J. Cox and P. Aslanidis Polyhedron 27 (2008) 175 Three- and four-coordinate copper(I) halide complexes of 2-(diphenylphosphano)benzaldehyde: Dimerization induced by thione-S ligation
Angad Kumar Singh, Sanyucta Kumari, K. Ravi Kumar, B. Sridhar and T.R. Rao Polyhedron 27 (2008) 181 Synthesis and spectral studies of the mesogenic Schiff-base, N,N0 -di-(40 -pentyloxybenzoate) salicylidene-1,8-diamino-3,6-dioxaoctane and crystal structure of the Zn(II) complex
Contents
Five half-sandwich organoruthenium(II) naphthylazo phenolate complexes have been synthesized and characterized. All the complexes show luminescent property in the visible region. Complex 2 was structurally characterized by X-ray crystallography and was used as an efficient catalyst for oxidation of a range of primary and secondary alcohols in the presence of NMO.
The ability of butyne-1,4-diol-Co2(CO)6 (1a) to undergo self-cyclisation reactions under acidic conditions to give both dimeric and trimeric crown-type macrocycles has been demonstrated; incorporation of a rigid 1,3-diyne unit into the macrocycle formed during selfreaction of 1a is also reported.
The coordination of 2-(diphenylphosphano)benzaldehyde (PCHO) to copper(I) halides leads to the formation of trigonal planar complexes of type [CuX(PCHO)2] with the phosphane acting as a monodentate via the P atom. These complexes react with pyridine-2thione or pyrimidine-2 thione forming dimeric species of type [CuX(PCHO)(thione)]2 in which the two CuI centres are doubly bridged by thione-S atoms. The crystal structures of three examples of the novel complexes have been characterized by X-ray crystallography.
A novel Schiff-base, N,N0 -di-(40 -pentyloxybenzoate)salicylidene-1,8-diamino-3,6-dioxaoctane (H2L4) with the mesogenic phase, nematic droplets, was prepared and its structure studied by mass, NMR and IR spectra. The Schiff base reacts with Zn(II) as a dinegative tetra-dentate species, giving rise to a non-mesogenic tetrahedral complex, [ZnL4]. The complex crystallizes in monoclinic P 21 =n which possesses screw axis and n-glide and also inherent twofold axis by the combination of these two symmetry operations. Considerable torsion has been observed between benzoate ring and salicylaldimine ring on either side of the metal atom.
Contents
B. Machura and J. Kusz Polyhedron 27 (2008) 187 Synthesis, spectroscopic characterisation, crystal and molecular structure of [ReOBr(quin-2-c)2] and [ReOCl(quin-2-c)2] complexes: DFT and TD-DFT calculations for [ReOBr(quin-2-c)2]
Feyyaz Durap, Nermin Biricik, ¨ zkar, Wee Han Ang, Bahattin Gu¨mgu¨m, Saim O Zhaofu Fei and Rosario Scopelliti Polyhedron 27 (2008) 196
Novel [ReOX(quin-2-c)2] complexes (X = Cl, Br; quin-2-c = quinoline-2-carboxylate ion) have been prepared by treatment of [ReOX3(AsPh3)2] with an excess of quinoline-2-carboxylic acid in acetonitrile. The complexes were characterised structurally and spectroscopically. The electronic structure of [ReOBr(quin-2-c)2] has been calculated with the density functional theory (DFT) method, and additional information about binding has been obtained by NBO analysis. The TD-DFT/ PCM calculations have been employed to produce a hundred of singlet excited-states, and UV–Vis spectrum of the [ReOBr(quin2-c)2] has been discussed on this basis.
Transition metal complexes (Cu, Pd, Pt) and chalcogenides of N,N-bis(diphenylphosphino)ethylaniline derivatives have been synthesized and characterized.
Synthesis and characterizations of N,N-bis(diphenylphosphino)ethylaniline derivatives and X-ray crystal structure of palladium (II), platinum (II) complexes
Xiao-Qing Shen, Hong-Chang Yao, Rui Yang, Zhong-Jun Li, Hong-Yun Zhang, Ben-Lai Wu and Hong-Wei Hou Polyhedron 27 (2008) 203 Synthesis, structure and thermal properties of polynuclear complexes with a new multidentate ligand, N,N0 -bis(5-ethyl-1,3,4-thiadiazol2-yl)-2,6-pyridinedicarboxamide
- akovic´, Zora Popovic´, Marijana D Gerald Giester and Masˇa Rajic´-Linaric´ Polyhedron 27 (2008) 210 Thiocyanate complexes of the group 12 metals with pyridine-2-carboxamide: Synthesis and structural characterization
Three polynuclear complexes based on N,N0 bis(5-ethyl-1,3,4-thiadiazol-2-yl)-2,6-pyridinedicarboxamide and inorganic ZnII and CdII salts were prepared and their structures were characterized by single-crystal X-ray analysis. The thermal stabilities of all the complexes and the thermal decomposition kinetics of complex 2 have been studied.
The three new heteroleptic thiocyanato complexes of zinc(II) (1), cadmium(II) (2) and mercury(II) (3) with picolinamide (pia) have been prepared, and their structures determined by X-ray crystallography. In all cases pia acts as a chelating ligand. Compound 1 forms two polymorphs of monomeric [Zn(SCN)2(pia)2] units. The structure of compound 2 comprises of polymeric [Cd(SCN)2(pia)]n and compound 3 of dimeric [Hg(SCN)2(pia)]2 units.
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xii
_ ¨ nal, Ahmet Karadag˘, Ibrahim O _ Ays¸egu¨l S¸enocak, Ibrahim Uc¸ar, Ahmet Bulut and Orhan Bu¨yu¨kgu¨ngo¨r Polyhedron 27 (2008) 223
Contents
Using Zn(hydeten)22+ or Cd(hydeten)22+ as bricks and [Pt(CN)4]2) anion as mortar, the novel binuclear one dimensional polymeric complexes 1 and 2 were prepared, and their structures were determined.
Syntheses, IR spectra, thermal properties and crystal structures of novel cyano-bridged polymeric complexes of zincII and cadmiumII with tetracyanoplatinateII
Zhi-Hua Li, Ping Lin and Shao-Wu Du Polyhedron 27 (2008) 232 Syntheses and characterization of three novel W(Mo)/Cu/S cluster-based layered polymers with 1,3,4-thiadiazole-2,5-dithiolate (SSS): Intriguing coordination modes of SSS Three novel 2D layered polymers, namely, [Et4N][WS3.5O0.5Cu3(CN)0.5(SSSH0.5)] (1), [Et4N][WS4Cu3(SSS)] (2) and [Et4N]2[MoS4Cu4(CN)(SSSH0.5)2] (3) have been prepared by solvothermal reactions of H2SSS (H2SSS =
Niraj Kumari, Rishikesh Prajapati and Lallan Mishra Polyhedron 27 (2008) 241 Reactivity of M(en)Cl2 (M = PdII/PtII, en = 1,2-diaminoethane) with N,N0 -bis(salicylidene)-p-phenylenediamine: Binding with hexafluorobenzene
Hassan Hadadzadeh, S. Jamil A. Fatemi, Seyedeh Raziyeh Hosseinian, Hamid Reza Khavasi and Rainer Po¨ttgen Polyhedron 27 (2008) 249 Synthesis, structure, spectroscopic, magnetic and electrochemical studies of a rare syn–anti acetate-bridged copper(II) complex
1,3,4-thiadiazole-2,5-dithiolate) with CuCN and [WOS3CuCN]2) or [W(Mo)S4]2) in organic solvents. In these complexes, the nestshaped {WS(O)S3Cu3} core in 1, the T-shaped {WS4Cu3} core in 2 and the saddle-shaped {MoS4Cu4} subunit in 3 serve as metal nodes whereas the SSS ligands function as multidentate linkers. The SSS ligand in both 1 and 2 coordinates to five Cu atoms via its exocyclic sulfur and endocyclic nitrogen atoms in an unprecedented fashion, while in 3, it acts as a rare tridentate ligand to connect three Cu atoms. Complexes 1–3 show optical transitions with band gaps of 1.90–2.24 eV.
S4/O1 N1/C11
S2
W1 S3
Cu3
Cu2b
Cu2 S5
S1 Cu1
S6
C1 N2
C2
N3
S7
S5a Cu1a
Cu2a
Cu3a
Part of the double chain in the anion of 1
The tetradentate Schiff base N,N0 -bis(salicylidene)-p-phenylenediamine upon its complexation with Pd(en)Cl2 and Pt(en)Cl2 provides two different products. In the case of the PtII complex, (2 + 2) condensation provides a metallocyclophane which is found to bindan electron acceptor molecule like hexafluorobenzene, as monitored spectroscopically.
The structure, spectroscopy and electrochemical properties of a novel dinuclear copper(II) complex, [{Cu(phen)2}2(l-CH3COO)][PF6]3, is reported. The crystal structure contains two independent Cu(II) ions with different geometries around each copper center which are bridged by an acetate anion. The acetate bridging ligand between the two Cu(II) centers shows a syn–anti coordination mode with a trigonal bipyramidal geometry for the Cu(1) center and a distorted square-based pyramidal geometry for the Cu(2) center.
P3
P2 N7 Cu2 N8
O2
O1 N3
N6
Cu1
N5
N2 N1 N4
P1
Contents
Vadapalli Chandrasekhar, Balasubramanian Murugesa Pandian and Ramachandran Azhakar Polyhedron 27 (2008) 255 Synthesis, structure and metallation of spiroN3P3(O2C12H8)(OC5H4N-2)4: A heptacoordinate Co(II) in the molecular structure of N3P3(O2C12H8)(OC5H4N-2)4 Æ Co(NO3)2
Susan A. Bourne and Lesego J. Moitsheki Polyhedron 27 (2008) 263 Hybrid inorganic–organic layered structures of [AuCl4]) and protonated bipyridyl derivatives
Pavel Drabina, Petr Valenta, Petr Jansa, Alesˇ Ru˚zˇicˇka, Jirˇ´ı Hanusek and Milosˇ Sedla´k Polyhedron 27 (2008) 268 Copper(II) complexes derived from substituted 2,20 -bis-(4-isopropyl-4-methyl-4,5-dihydro-1Himidazol-5-one) ligands: Synthesis, structure and catalytic activity
E. Manoj and M.R. Prathapachandra Kurup Polyhedron 27 (2008) 275 Structural and spectral studies of nickel(II) complexes with N(4),N(4)-(butane-1,4-diyl) thiosemicarbazones Nickel(II) complexes of quinoline-2-carbaldehyde N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL1) and 2-benzoylpyridine N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL2) were synthesized and physico-chemically characterized by means of partial elemental analyses, molar conductance
Spiro-N3P3(O2C12H8)(OC5H4N-2)4 (L) is an efficient multi-site coordination ligand which binds with transition metal ions to afford the mononuclear complexes [LCu(NO3)2], [LCo(NO3)2] and [LZnCl2]. The ligand L shows diverse coordination behavior towards these metal ions.
Complexes of [AuCl4]) with 4,40 -dipyridylethane, 4,40 -dipyridylethene and 4,40 -bipyridine-N,N0 -dioxide form hybrid organic– inorganic layered structures. The dipyridyl derivatives are stabilized by N–H Cl and Au Cl interactions. In the complex with and 4,40 -bipyridine-N,N0 -dioxide the organic layers consist of hydrogen-bonded bipyridyldioxide cations, with a short O–H O contact.
New chiral N,N-bidentate ligands derived from substituted 2,20 -bis-(4-isopropyl-4methyl-4,5-dihydro-1H-imidazol-5-one) have been prepared and characterised by means of 1 H and 13C NMR spectroscopy and optical rotation. Their Cu(II) complexes have been prepared and their structures have been studied by computational methods and by X-ray diffraction. The catalytic activity of some complexes have been studied.
measurements, magnetic measurements, electronic and infrared spectral studies. Three complexes were given the formulae [Ni(HL1)2]Cl2 (1), [Ni(HL2)L2]ClO4 Æ 7H2O (2) and [NiL2Cl] Æ 0.5H2O (3). The structure of compound 1 has been solved by single crystal X-ray crystallography and is found to be distorted octahedral. Compound 2, when crystallized in DMSO solution, got deprotonated to form a new compound [Ni(L2)2] (2a), with a distorted octahedral Ni(II) center. In compound 1, HL1 coordinates to the metal in the thione form, while in compounds 2a and 3, HL2 coordinates in its deprotonated thiolate form.
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Zdenek Spichal, Vaclav Petricek, Jiri Pinkas and Marek Necas Polyhedron 27 (2008) 283 Two-dimensional lanthanide coordination polymers with bis(diphenylphosphino)hexane dioxide. The determination of the polymeric structure from twinned crystals
Athanassios C. Tsipis and Paraskevas A. Karipidis Polyhedron 27 (2008) 289 Deciphering the bonding mode of the trihalide ligands in a series of halogen carrier homoand hetero-trihalide Cu(II) Schiff base complexes
Jung Hak Lim, Houng Sik Yoo, Jung Hee Yoon, Eui Kwan Koh, Hyoung Chan Kim and Chang Seop Hong Polyhedron 27 (2008) 299 Structure and magnetic properties of cyanideV bridged NiII 9 Mo6 cluster modified by bidentate capping ligands
Sujittra Youngme, Jaturong Phatchimkun, Nanthawat Wannarit, Narongsak Chaichit, Siwaporn Meejoo, Gerard A. van Albada and Jan Reedijk Polyhedron 27 (2008) 304 New ferromagnetic dinuclear triply-bridged copper(II) compounds containing carboxylato bridges: Synthesis, X-ray structure and magnetic properties Six new triply-bridged dinuclear copper(II) complexes containing carboxylato bridges have been reported and their magnetic properties studied. A structural classification of this
Contents
Lanthanide salts and bis(diphenylphosphino)hexane dioxide (dpphO2) formed under solvothermal conditions coordination polymers [Ln(dpphO2)2(NO3)2](NO3) and [Ln(dpphO2)2Cl2]Cl, featuring two-dimensional network structures of the (4, 4) topology. The solution and refinement of the structures of the nitrate compounds was based on the data obtained on pseudo-merohedrally twinned crystals.
The molecular and electronic structure of the [Cu(RdienR)(X)(XY2)] complexes and their [Cu(RdienR)(X)2] precursors were analyzed in terms of charge decomposition analysis (CDA), natural bond orbital (NBO) population analysis, and percentage compositions of molecular orbitals in order to understand the nature of the bonding between the [XY2]) ligands and the Cu(II) central metal ion, and unveil the effect of coordination on the bonding mechanism in the coordinated [XY2]) ligands in comparison to that of the ‘‘free’’ [XY2]) anions.
A cyanide-bridged Ni9Mo6 cluster (1) capped with chelating bidentate ligands was prepared by self-assembling [Mo(CN)8]3), Ni2+, and bpy in a stoichiometric ratio. Compound 1 crystallized in the triclinic system with space group P 1 shows a body-centered Ni cube capped with six Mo entities. The non-covalent p–p stackings present in 1 lead to the extension of the molecule to a 2D sheet. Magnetic data exhibit that intracluster ferromagnetic interactions in 1 arise through the CN linkage coupled with zero-field splitting of the ground state.
type of dimers has been performed, based on the local five-coordinate geometry with different degrees of distortion and the relative arrangement of the two basal planes, giving rise to different classes (A–F) of complexes. The most logical explanations have been made for each class describing different magnetic interactions. Practically, the correlations between structural data and J values are found for some classes of complexes. Extended Hu¨ckel calculations were preformed for class B complexes, the results are found to be useful for the proper interpretation and correlation of the magnetic data and dimer structure of the present complexes.
Contents
Jong Hwa Jeong, Young Hun An, Youn K. Kang, Quang Trung Nguyen, Hyosun Lee and Bruce M. Novak Polyhedron 27 (2008) 319 Synthesis of polylactide using a zinc complex containing (S)-N-ethyl-N-phenyl-2-pyrrolidinemethanamine
The reaction between ZnCl2 and (S)-N-ethylN-phenyl-2-pyrrolidinemethanamine (S-EPP) as a chiral ligand affords [ZnCl2(S-EPP)], whose structure has been determined by X-ray crystallography. [ZnEt2(S-EPP)] has demonstrated high activity towards the polymerization of rac-lactide with a maximum turnover frequency (TOF) of 121. The observed heterotacticity was limited to under 0.6.
xv
. . .
.
. .
. N(2) .
N(1)
. .
.
Zn
.. Cl(2)
Cl(1)
Yan Z. Voloshin, Oleg A. Varzatskii, Alexander S. Belov, Zoya A. Starikova, Alexander V. Dolganov and Tatiana V. Magdesieva Polyhedron 27 (2008) 325 New antimony-capped iron(II) and cobalt(III) clathrochelate precursors of the polytopic hybrid cage complexes: Synthesis, X-ray structures and electrochemistry
Eula´lia Pereira, Lı´gia R. Gomes, John N. Low and Baltazar de Castro Polyhedron 27 (2008) 335 Synthesis, spectroscopic, electrochemical and structural characterization of Cu(II) complexes with asymmetric NN0 OS coordination spheres
Template macrocyclization on the iron(II) ion and the capping of K3CoDm3 complex with triethylantimony(V) derivatives afforded the triethylantimony-capped iron(II) and cobalt(III) tris-dimethylglyoximates, characterized using elemental analysis, mass, IR, UV– Vis, 57Fe Mo¨ssbauer, NMR spectroscopies, and X-ray crystallography. The cyclic voltammograms show oxidation and reduction waves assignable to Fe2+/3+ and Co2+/3+ couples.
Copper Schiff base complexes with N2OS coordination spheres were synthesized and characterized electrochemically and by EPR spectroscopy. The molecular and the crystal structure have been determined by X-ray diffractometry.
n N
R N
Cu O
S S
N
N
Cu S S
Ze-Li Yuan, Qi-Long Zhang, Xue Liang, Bi-Xue Zhu, Leonard F. Lindoy and Gang Wei Polyhedron 27 (2008) 344 A new series of dinucleating macrocyclic ligands and their complexes of zinc(II)
The metal template synthesis of a new category of dinucleating macrocyclic Schiff base ligands with ring sizes from 34- to 52-membered and their interaction with zinc(II) are reported.
O O
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Contents
Eleni K. Efthimiadou, Alexandra Karaliota and George Psomas Polyhedron 27 (2008) 349 Mononuclear dioxomolybdenum(VI) complexes with the quinolones enrofloxacin and sparfloxacin: Synthesis, structure, antibacterial activity and interaction with DNA
Sachindranath Pal, Anil Kumar Barik, Samik Gupta, Somnath Roy, Tarak Nath Mandal, Arijit Hazra, Mohamed Salah El Fallah, Ray J. Butcher, Shie-Ming Peng, Gene-Hsiang. Lee and Susanta Kumar Kar Polyhedron 27 (2008) 357 Anion dependent formation of linear trinuclear mixed valance cobalt(III/II/III) complexes and mononuclear cobalt(III) complexes of a pyrazole derived ligand – Synthesis, characterization and X-ray structures
B. Machura and J. Kusz Polyhedron 27 (2008) 366 Reactivity of oxorhenium(V) complexes towards 8-hydroxyquinoline-2-carboxylic acid: X-ray structure of [ReOCl2(hquin-2-COOH)(AsPh3)] Æ MeCN and [ReOCl2(hquin-2COOH)(PPh3)] Æ MeCN complexes. DFT and TDDFT calculations for [ReOCl2(hquin-2COOH)(AsPh3)] The reactions of [ReOX3(EPh3)2] with 8-hydroxyquinoline-2-carboxylic acid (Hhquin-2COOH) have been examined and [Re-
Nand K. Singh, Mamata Singh, Pratibha Tripathi, Ajay K. Srivastava and Ray J. Butcher Polyhedron 27 (2008) 375 0
Synthesis of a new N,N -ethane-1,2-bis(4-methoxyphenyl)carbothioamide ligand and its Cu(I) and Ag(I) complexes
The synthesis, the characterization, the antibacterial activity and the interaction with calfthymus DNA of the neutral mononuclear dioxomolybdenum(VI) complexes with the quinolone antibacterial agents enrofloxacin and sparfloxacin are presented.
Co(II) mediated anion dependent Schiff base complex formation was studied. Depending upon the proportion of 5-methylpyrazole-3carbaldehyde (MPA), 1,3-diamino-2-propanol (DAP) and metal salts with different anions, two trinuclear linear pyrazolate bridged mixed valence Co(III/II/III) complexes and a few mononuclear Co(III) complexes were characterized.
OX2(hquin-2-COOH)(EPh3)] Æ MeCN (X = Cl, Br; E = As, P) complexes have been obtained. All the complexes were characterised by IR, UV–Vis spectroscopy and elemental analysis. The crystal and molecular structures have been determined for [ReOCl2(hquin-2-COOH)and [ReOCl2(hquin-2(AsPh3)] Æ MeCN COOH)(PPh3)] Æ MeCN. The electronic structure of [ReOCl2(hquin-2-COOH)(AsPh3)] has been calculated with the density functional theory (DFT) method, and TDDFT calculations have been employed to produce a hundred of singlet excited-states starting from the ground-state geometry optimized in the gas phase.
Complexes [M(H2L)(PPh3)2]NO3 Æ 0.5H2O, (M = Cu, Ag) formed with N, N0 -ethane-1,2bis(4-methoxyphenyl)carbothioamide (H2L) have MS2P2 coordination and the ligand is bonded through the sulfur atoms forming a nine-membered chelate ring. The molecular packing in the copper(I) complex is dominated by hydrogen bonding offered by the NO3 ion and the basal plane of the CuS2 chelate ring. The specific arrangement of two nitrate ions and two complex cations results in a rectangular shaped anionic channel.
Contents
Richard J. Bushby, Colin Kilner, Norman Taylor and Rhidian A. Williams Polyhedron 27 (2008) 383 Antiferromagnetic spin-coupling between MnII and amminium radical cation ligands: Models for coordination polymer magnets
Agnieszka Mech Polyhedron 27 (2008) 393 Crystal structure and optical properties of novel (N(C2H5)4)[Nd(hfa)4(H2O)] tetrakis complex
Zenixole R. Tshentu, Thomas I.A. Gerber, Ryan Walmsley and Peter Mayer Polyhedron 27 (2008) 406 Imidazole-based bifunctional chelates for the ‘‘fac-[Re(CO)3]+’’ core
Zdeneˇk Tra´vnı´cˇek, Richard Pastorek and Va´clav Slova´k Polyhedron 27 (2008) 411 Novel octahedral nickel(II) dithiocarbamates with bi- or tetradentate N-donor ligands: X-ray structures of [Ni(Bzppzdtc)(phen)2]ClO4 Æ CHCl3 and [Ni(Bz2dtc)2(cyclam)]
A series of novel octahedral nickel(II) dithiocarbamate complexes involving bidentate nitrogen-donor ligands (phen or bpy) or a
A one-electron oxidation converts the triarylamine ligand of the complex L2Mn(hfac)2 (L = 400 ,4000 -di-tert-butyl-20 ,200 ,2000 trimethoxy{4-(40 -diphenylaminophenyl)pyridine}) to the radical cation and gives an S = 2 system: J/kb = )1.5 K. A two-electron oxidation converts both triarylamine ligands to the radical cation; S = 3/2: J/kb = )0.3 K.
The novel [Nd(hfa)4(H2O)](N(C2H5)4) tetrakis complex has been synthesized and characterized using X-ray, DSC. An absorption spectrum of the single crystal were recorded and parameterized in terms of Judd-Ofelt theory.
This paper presents the syntheses of tridentate bis-imidazole type ligands, and the study of their coordination chemistry with [Re(OH2)3(CO)3]Br or (NEt4)2[ReBr3(CO)3] as Re(I) precursor compounds. Crystal structure evidence for one of the analogues shows that the tridentate ligand adopts a facial arrangement around the Re(I) ion, imposed by the fac-[Re(CO)3]+ core.
tetradentate ligand (cyclam) of the composition [Ni(BzMetdtc)(phen)2]ClO4 (1), [Ni(Pe2dtc)(phen)2]ClO4 (2), [Ni(Bzppzdtc)(phen)2]ClO4 Æ CHCl3 (3), [Ni(Bzppzdtc)(phen)2](SCN) (4), [Ni(BzMetdtc)(bpy)2]ClO4 Æ 2H2O (5), [Ni(Pe2dtc)(cyclam)]ClO4 (6), [Ni(BzMetdtc)2(cyclam)] (7), [Ni(Bz2dtc)2(cyclam)] (8) and [Ni(Bz2dtc)2(phen)] (9) have been synthesized. Broad spectrum of physical techniques, including X-ray analysis of 3 and 8, proved the octahedral geometry in the vicinity of the nickel atom in all cases. The catalytic influence of complexes 2, 3, 6, and 7 on graphite oxidation was studied and discussed.
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Polyhedron 27 (2008) 420 Syntheses, characterizations and crystal structures of monomeric or macrocyclic compounds of di- or triorganotin (IV) moieties with 4,40 -thiodibenzenethiol Six organotin compounds with 4,40 -thiodibenzenethiol (LH2) of type RnSnL4)nSnRn (n = 3: R = Me 1, Ph 2, PhCH2 3, n = 2: R = Me 4, Ph 5, PhCH2 6) have been synthesized. All compounds were characterized by elemental analysis, IR and NMR (1H, 13C,
I.M. Ali, E.S. Zakaria, M.M. Ibrahim and I.M. El-Naggar Polyhedron 27 (2008) 429 Synthesis, structure, dehydration transformations and ion exchange characteristics of ironsilicate with various Si and Fe contents as mixed oxides
119
Sn) spectra. The structures of compounds 1, 2, 4, 5 and 6 were also determined by X-ray diffraction analysis, which revealed that compounds 1 and 2 were monomeric structures, compounds 4, 5 and 6 were centrosymmetric dinuclear macrocyclic structures, all the tin(IV) atoms are four-coordinated. Furthermore, supramolecular structures were also found in compounds 1, 2, 4, 5 and 6, which exist one-dimensional chains, two-dimensional networks or three-dimensional structure through intermolecular C–H S weak hydrogen bonds (WHBs), non-bonded Sn S interactions or C–H p interactions.
Iron silicate was obtained from iron oxide impregnated with silica in different Fe/Si molar ratios. Kinetics of dehydration transformation indicated a 1st order process for different silicate ratios. Application of the materials as ion exchangers showed a high affinity for ions of different charges on increasing the solution pH as well as with the silica content increasing.
HS
S
SH
+
C6H6
2R 3SnCl
R3SnS
EtONa
SSnR 3
S
R=Me 1, Ph 2, PhCH 2 3
S R HS
C6H6 EtONa
SH + R 2SnCl 2
S
S
S
S
S
Sn R
R Sn R
S R=Me 4, Ph 5, PhCH 2 6
4
3
log K d
Chun-Lin Ma, Zhi-Fo Guo and Ru-Fen Zhang
Contents
2
Fe S i - II
C s+ N a+
1
C o2+ C e3+
0 1
2
3
4
5
pH
Tu¨lay Bal-Demirci Polyhedron 27 (2008) 440 Synthesis, spectral characterization of the zinc(II) mixed-ligand complexes of N(4)-allyl thiosemicarbazones and N,N,N0 ,N0 -tetramethylethylenediamine, and crystal structure of the novel [ZnL2(tmen)] compound
Dohyun Moon, Junghyun Kim, Minhak Oh, Byoung Jin Suh and Myoung Soo Lah Polyhedron 27 (2008) 447 Synthesis and characterization of a bis-l,g1carboxylate-bridged dinuclear manganese(II) complex containing a tetradentate tripodal ligand, N-(benzimidazol-2-ylmethyl)iminodiacetic acid
Mixed-ligand zinc complexes with N,N,N,N0 tetramethylethylenediamine (tmen) and Rsalicylaldehyde N(4)-allyl thiosemicarbazones (R: 3-OCH3 (L1), 5-Br(L2)), [ZnL1,2(tmen)], were synthesized and the complexes were characterized by elemental, spectral and single crystal analysis. Crystal of [ZnL2(tmen)] have a slightly distorted square pyramid involving O, N, S atoms of thiosemicarbazone and one N atom of tmen in basal plane and the other N atom of tmen in apex of the pyramid. The noncoordinated allyl group is disordered.
A dinuclear manganese(II) complex has been prepared using a tripodal ligand, where the complex mimics several important structural features of the manganese arginase core, such as the simultaneous presence of both l,g1 bridging carboxylate and non-bridging monodentate carboxylate binding modes, and an intramolecular hydrogen bond involving a coordinated water molecule.
6
7
8
9
Contents
Sebusi Odisitse and Graham E. Jackson Polyhedron 27 (2008) 453 In vitro and in vivo studies of N,N0 -bis[2(2-pyridyl)-methyl]pyridine-2,6-dicarboxamide– copper(II) and rheumatoid arthritis
- akovic´, Zora Popovic´, Marijana D Gerald Giester and Masˇa Rajic´-Linaric´ Polyhedron 27 (2008) 465 Synthesis, spectroscopic and structural investigation of Zn(NCS)2(nicotinamide)2 and [Hg(SCN)2(nicotinamide)]n
xix
Copper complexes of N,N0 -bis[2(2-pyridyl)methyl]pyridine-2,6-dicarboxamide have been evaluated as potential anti-inflammatory agents using potentiometry, biophysical measurements and animal studies.
The nicotinamido (nia) complexes of the thiocyanates of zinc (1) and mercury(II) (2) were prepared and spectroscopically and thermally characterized, and their structures were determined by X-ray crystallography. The nia ligand acts as a monodentate ligand through the pyridine nitrogen. Compound 1 comprises of monomeric [Zn(SCN)2(nia)2], while compound 2 of polymeric [Hg(SCN)2(nia)]n units. Centrosymmetric H-bond dimers of R22(10) type in 1 and of R22(8) type in 2 are formed.
Corrigendum to ‘‘Three novel trinuclear zinc(II)/nickel(II) complexes with pentadentate ligands N-nitrobenzoylsalicylhydrazidate’’ [Polyhedron 26 (2007) 4793–4798]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
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Polyhedron 27, issue 1, 20 Jaunary 2008 www.elsevier.com/locate/poly
Contents Papers Jose´ S. Casas, Eduardo E. Castellano, Javier Ellena, Marı´a S. Garcı´a-Tasende, Agustı´n Sa´nchez, Jose´ Sordo and ´ ngeles Touceda A Polyhedron 27 (2008) 1
New diphenyllead(IV) complexes have been synthesized and characterized by X-ray crystallography. Analysis of the Pb–S, Pb–N and Pb–O bond distances in these complexes suggests a borderline Lewis acid character for the diphenyllead(IV) cation.
New insights on the Lewis acidity of diorganolead(IV) compounds: Diphenyllead(IV) complexes with N,O,S-chelating ligands
Guan-Cheng Xu, Li Zhang, Lang Liu, Guang-Fei Liu and Dian-Zeng Jia Polyhedron 27 (2008) 12 Syntheses, characterization and crystal structures of mixed-ligand Cu(II), Ni(II) and Mn(II) complexes of N-(1-phenyl-3-methyl-4propenylidene-5-pyrazolone)-salicylidene hydrazide containing ethanol or pyridine as a co-ligand
Five mixed-ligand complexes of Cu(II), Ni(II) and Mn(II) have been synthesized and characterized. The results show that the ligand undergoes isomerization in the reaction and acts as a double negatively charged tridentate chelating agent coordinated to the metal ion, other coordination sites of metal ions were completed either by the ethanol or pyridine molecules.
HC
HC
HC
HO
O
NH
OH
N
Crystallographic and thermal investigations of organic ammonium tetrathiomolybdates
Elsevier Ltd.
OH
N
HC
HC HO
HC N
O
HO HC
NH
C
O
N
C N
C
keto form (III)
Polyhedron 27 (2008) 25
O
N
O
N H
The structures of N-methylethylenediammonium tetrathiomolybdate, N-(3-aminopropyl)propane-1,3-diaminium tetrathiomolybdate, 4-(2-ammonioethyl)piperazin-1-ium tetrathiomolybdate hemihydrate consist of tetrahedral tetrathiomolybdate anions which are linked to the organic ammonium cations with the aid of weak hydrogen bonding interactions. A comparative study of the structural features of 28 tetrathiomolybdates is described.
C
N
enol form (I)
N
Bikshandarkoil R. Srinivasan, Sunder N. Dhuri, Ashish R. Naik, Christian Na¨ther and Wolfgang Bensch
HO NH
C
C
+ HN
N
HC
N N
OH
C OH
enol form (II)
vi
Leji Latheef and Maliyeckal R. Prathapachandra Kurup Polyhedron 27 (2008) 35 Spectral and structural studies of nickel(II) complexes of salicylaldehyde 3-azacyclothiosemicarbazones Four nickel(II) complexes of salicylaldehyde N(4)-hexamethyleneiminyl thiosemicarbazone (H2L1) and two nickel(II) complexes of salicylaldehyde N(4)-pyrrolidine thiosemicarbazone (H2L2) have been synthesized and
Akella Sivaramakrishna, Banothile C.E. Makhubela, Feng Zheng, Hong Su, Gregory S. Smith and John R. Moss Polyhedron 27 (2008) 44 Synthesis, structure and reactivity of cis[PtL2(1-alkenyl)2] complexes
Lincoln Lucilio Romualdo, Andre´ Luis Bogado, Eliana M.A. Valle, Icaro S. Moreira, Javier Ellena, Eduardo E. Castellano, Ma´rcio P. de Araujo and Alzir A. Batista Polyhedron 27 (2008) 53 Novel manganese (III) porphyrin containing peripheral ‘‘[RuCl(dppb)(X-bipy)]+’’ cations [dppb = 1,4-bis(diphenylphosphino)butane and X = –CH3, –OMe, –Cl]. X-ray structure of the cis-[RuCl(dppb)(bipy)(4-Mepy)]PF6 complex
Ana C.D. Mido˜es, Pedro E. Aranha, Mirian P. dos Santos, E´rica Tozzo, Sandra Romera, Regina H. de A. Santos and Edward R. Dockal Polyhedron 27 (2008) 59 Synthesis, characterization, crystal structure and catalytic property of [Cu(SalAHE)2] (SalAHE = salicylaldehydeimine-1-hydroxyethane) complex for the oxidation of 3,5-ditert-butylcatechol
Contents
characterized by different physicochemical techniques. The complexes were given the formulae [Ni(HL2)2] (1), [NiL2py] (2), [NiL2apic] (3), [NiL2c-pic] Æ H2O (4), [NiL4py] (5) and [NiL4c-pic] (6). In complex 1, the ligand moieties are coordinated as monoanionic (HL)). The other complexes posses the stoichiometry NiLB, where B represents different bases, viz. pyridine and a/b/c-picoline. The coordination geometry around nickel(II) in 2 and 3 is found to be distorted square planar in geometry with coordination of azomethine nitrogen, thiolato sulfur, phenolato oxygen and pyridyl nitrogen atoms.
The synthesis and characterization of several new bis(1-alkenyl)platinum(II) complexes have been carried out. The insertion of carbon monoxide into the metal–carbon bonds of the platinum alkenyl complexes and other reactions including transmetalation, intermolecular alkenyl migrations, and oxidative addition of methyl iodide are also described. The thermal decomposition studies of the bis(alkenyl) complexes are also reported.
New tetraruthenated manganese (III) porphyrins were synthesized and characterized (31P NMR, cyclic voltammetry, UV–Vis). This new system presents four units of cationic ‘‘[RuCl(dppb)(X-bipy)]+’’. The electrochemical and catalytic properties of the central manganese (III) show dependence on the characteristics of the peripheral ruthenium complexes as evidenced by the Mn(III)/Mn(II) reduction potential.
A new Schiff base copper(II) complex [Cu(SalAHE)2] was synthesized and characterized. The crystal structure of this complex shows that it is almost coplanar with the two ligands in the trans configuration. This complex with a simple structure is able to oxidize 3,5-di-tertbutylcatechol to the respective o-quinone with molecular oxygen.
Contents
Edwin C. Constable, Catherine E. Housecroft, Markus Neuburger, Silvia Schaffner and Ellen J. Shardlow Polyhedron 27 (2008) 65
The synthesis and characterization of R3PAu(1–H) (R = nBu, Ph) and (1–H)Au(l-dppe)Au(1–H) (1 = HCBCCH2Otpy, tpy = 2,20 :60 ,200 -terpyridine) are reported.
Gold(I) phosphine-decorated 2,20 :60 ,200 -terpyridine ligands
M. Akbar Ali, Hjh Junaidah Hj Abu Bakar, A.H. Mirza, S.J. Smith, L.R. Gahan and Paul V. Bernhardt Polyhedron 27 (2008) 71 Preparation, spectroscopic characterization and X-ray crystal and molecular structures of nickel(II), copper(II) and zinc(II) complexes of the Schiff base formed from isatin and Smethyldithiocarbazate (Hisa-sme)
P. Chandrasekaran, Joel T. Mague and Maravanji S. Balakrishna Polyhedron 27 (2008) 80 Synthesis and characterization of RuII/AuI, PdII/AuI, PdII/2AuI, PtII/2AuI and CuI/2AuI heterometallic complexes of cyclodiphosphazane cis-{(o-MeOC6H4O)P(l-NtBu)}2
Qing-Xiang Liu, Li-Na Yin, Xiu-Mei Wu, Jin-Cheng Feng, Jian-Hua Guo and Hai-Bin Song Polyhedron 27 (2008) 87 New N-heterocyclic carbene mercury(II) and silver(I) complexes
X-ray crystallographic structure determination of the [Ni(isasme)2] Æ MeCN complex (isasme = monoanionic) form of the Schiff base formed by condensation of isatin with S-methyldithiocarbazate reveals a six-coordinate, distorted octahedral. Structure By contrast, [Zn(isasme)2] Æ MeOH is four-coordinate and has a distorted tetrahedral geometry. The structure of the copper(II) complex [Cu(isa-sme)2] Æ DMSO is complicated and comprises two different complexes in the asymmetric unit, one four- and the other fivecoordinate.
Selective monodentate coordination of the cyclodiphosphazane, cis-{(o-MeOC6H4O)P(l-NtBu)}2 with metal precursors such as [RuCl2(g6-cymene)]2, [PdCl2(PEt3)]2 and [MCl2(COD)] (M = Pd, Pt) and bridging bidentate coordination with [AuCl(SMe2)] gives facile synthetic approach for RuII/AuI, PdII/AuI, PdII/2AuI, PtII/2AuI and CuI/2AuI heterometallic complexes.
The complexes [1-(9-anthracenylmethyl)-3octylimy]2Hg[HgCl4] (2a) (imy = imidazol-2ylidene) and [1-(9-anthracenylmethyl)-3butylbimy]2AgPF6 (2b) (bimy = benzimidazol2-ylidene) have been prepared and characterized. Crystal packing of complex 2a revealed that 1D polymeric chains are formed by [1-(9-anthracenylmethyl)-3-octylimy]Hg and [HgCl4]2) through weak Hg…Cl bonds. The packing diagram of 2b showed that 1D supramolecular chains are formed by both benzimidazole ring head to tail p–p stacking interactions and anthracene ring face-to-face p–p stacking interactions.
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Contents
Harri Sopo, Ari Lehtonen and Reijo Sillanpa¨a¨ Polyhedron 27 (2008) 95 Uranyl(VI) complexes of [O,N,O,N0 ]-type diaminobis(phenolate) ligands: Syntheses, structures and extraction studies The reaction between uranyl nitrate hexahydrate and phenolic ligand precursors N,N-bis(2-hydroxy-3,5-dialkylbenzyl)-N0 ,N0 -dimethylethylenediamine (alkyl = methyl or
Somnath Roy, Tarak Nath Mandal, Anil Kumar Barik, Samik Gupta, Ray J. Butcher, Mohamed Salah El Fallah, Javier Tercero and Susanta Kumar Kar Polyhedron 27 (2008) 105 A pyrazole-based orthogonal ferromagnetically coupled [2 · 2] homoleptic square Cu4 grid: Magnetostructural correlations
O.O.E. Onawumi, O.O.P. Faboya, O.A. Odunola, T.K. Prasad and M.V. Rajasekharan Polyhedron 27 (2008) 113 Synthesis, structure and spectral studies on mixed ligand copper(II) complexes of diimines and acetylacetonate
Andrea Lakatos, Tama´s Kiss, Roberta Bertani, Alfonso Venzo and Valerio B. Di Marco Polyhedron 27 (2008) 118 Complexes of Al(III) with
D -gluconic
acid
t-butyl) (H2L1, H2L2) in a 1:2 molar ratio (M to L) in acetonitrile afford a uranyl complex of the form [UO2(HLn)(NO3)] Æ xCH3CN (n = 1, x = 1 and n = 2, x = 2) whereas H2L1 and N-(2-pyridylmethyl)-N,N-bis(2-hydroxy-3,5-dimethylbenzyl)amine (H2L3) in the presence of a base (triethylamine) afford the mononuclear, neutral uranyl complexes [UO2(HLn)2] Æ xCH3CN (n = 1, x = 0 and n = 3, x = 2). Extraction studies of the uranyl ion from water to dichloromethane with these ligands are also presented.
Strategic and systematic positioning of polyfunctional groups within the backbone of a pyrazole derived ditopic ligand (PzOAPyz) leads to the formation of an aesthetically looking sophisticated supramolecular self-assembled homoleptic Cu4(l-O4) square grid which exhibits intramolecular ferromagnetic exchange with an S = 2 magnetic ground state.
The simplest member of the CASIOPEINAS family of cytotoxic and antineoplastic compounds, [Cu(acac)(bpy)(H2O)]NO3 is prepared and characterized. The Cu(II) complex ion has a distorted square pyramidal coordination in the solid state and presumably also in solution.
+
OH2 N
O
Cu N
The complexation of Al(III) with D -gluconic acid has been studied in solution by pHpotentiometry, ESI mass spectrometry and one- and two-dimensional NMR spectroscopy. A solid complex [AlL2H)1] Æ 2H2O was isolated as a microcrystalline powder and characterized. The structures of the complexes are discussed on the basis of spectroscopic results and MM force field calculations.
O
Contents
Ismail Yilmaz, Hamdi Temel and Hu¨seyin Alp Polyhedron 27 (2008) 125 Synthesis, electrochemistry and in situ spectroelectrochemistry of a new Co(III) thio Schiffbase complex with N,N0 -bis(2-aminothiophenol)-1,4-bis(carboxylidene phenoxy)butane
George Psomas, Alketa Tarushi and Eleni K. Efthimiadou Polyhedron 27 (2008) 133 Synthesis, characterization and DNA-binding of the mononuclear dioxouranium(VI) complex with ciprofloxacin
Moutusi Dasgupta, Sumon Nag, Gopal Das, Munirathinam Nethaji and Samaresh Bhattacharya Polyhedron 27 (2008) 139 N,N0 -Bis(aryl)pyridine-2,6-dicarboxamide complexes of ruthenium: Synthesis, structure and redox properties
Matthias Linnert, Clemens Bruhn, Harry Schmidt, Renate Herzog and Dirk Steinborn Polyhedron 27 (2008) 151 Synthesis, structure and characterization of [Mg7(l3-OCH2CH2OMe)6(l-OCH2CH2OMe)6][Al(n-Bu)4]2 – A cationic heptanuclear magnesium complex consisting of discrete cations and tetrabutylaluminate anions
ix
A new cobalt Schiff-base complex, [Co(L)(OH)(H2O)] (where L = [N,N0 -bis(2-aminothiophenol)-1,4-bis(carboxylidene phenoxy)butane), was synthesized and its electrochemical and spectroelectrochemical properties were investigated using cyclic voltammetry (CV), differential pulse voltammetry (DPV) and thin-layer spectro-electrochemistry in solutions of dimethyl sulfoxide (DMSO) and dichloromethane (CH2Cl2).
The synthesis, characterization and interaction with calf-thymus DNA of the neutral mononuclear dioxouranium(VI) complex with the second-generation quinolone antibacterial agent ciprofloxacin are presented.
Reaction of five N,N0 -bis(aryl)pyridine-2,6-dicarboxamides (1) with [Ru(trpy)Cl3](trpy = 2,20 ,200 -terpyridine) in refluxing ethanol in the presence of triethylamine afforded a group of complexes of the type [RuII(trpy)(L-R)] (2, n = 0), which upon constant potential coulometric oxidation produced the corresponding [RuIII(trpy)(L-R)]+ complexes (2, n = 1), which have been isolated as the perchlorate salts.
Crystals of the title complex were found to consist of discrete heptanuclear magnesium complex cations built up from seven edgeshared MgO6 octahedra (I) and [Al(n-Bu)4]) anions (II). 1H, 13C and 27Al NMR spectroscopic measurements showed that in THF solution the structures both of the cations and anions are preserved and that there are no cation–anion interactions reducing their symmetry (dAl = 151.6, w1/2 = 5 Hz; 1J(27Al,13C) = 72.3 Hz).
n+ O
O
N N
O NH
N
O
N
Ru
R
HN
R N
R
R
N N
R= OCH3, CH3, H, Cl, NO2
1
I
2
II
x
K. Naresh Kumar, G. Venkatachalam, R. Ramesh and Y. Liu Polyhedron 27 (2008) 157 Half-sandwich para-cymene ruthenium(II) naphthylazophenolato complexes: Synthesis, molecular structure, light emission, redox behavior and catalytic oxidation properties
Vladimir B. Golovko, Martin J. Mays and Gregory A. Solan Polyhedron 27 (2008) 167 Self-cyclisation versus diynediol-promoted ring closure during the construction of coordinated crown-type macrocycles
M. Mamais, P.J. Cox and P. Aslanidis Polyhedron 27 (2008) 175 Three- and four-coordinate copper(I) halide complexes of 2-(diphenylphosphano)benzaldehyde: Dimerization induced by thione-S ligation
Angad Kumar Singh, Sanyucta Kumari, K. Ravi Kumar, B. Sridhar and T.R. Rao Polyhedron 27 (2008) 181 Synthesis and spectral studies of the mesogenic Schiff-base, N,N0 -di-(40 -pentyloxybenzoate) salicylidene-1,8-diamino-3,6-dioxaoctane and crystal structure of the Zn(II) complex
Contents
Five half-sandwich organoruthenium(II) naphthylazo phenolate complexes have been synthesized and characterized. All the complexes show luminescent property in the visible region. Complex 2 was structurally characterized by X-ray crystallography and was used as an efficient catalyst for oxidation of a range of primary and secondary alcohols in the presence of NMO.
The ability of butyne-1,4-diol-Co2(CO)6 (1a) to undergo self-cyclisation reactions under acidic conditions to give both dimeric and trimeric crown-type macrocycles has been demonstrated; incorporation of a rigid 1,3-diyne unit into the macrocycle formed during selfreaction of 1a is also reported.
The coordination of 2-(diphenylphosphano)benzaldehyde (PCHO) to copper(I) halides leads to the formation of trigonal planar complexes of type [CuX(PCHO)2] with the phosphane acting as a monodentate via the P atom. These complexes react with pyridine-2thione or pyrimidine-2 thione forming dimeric species of type [CuX(PCHO)(thione)]2 in which the two CuI centres are doubly bridged by thione-S atoms. The crystal structures of three examples of the novel complexes have been characterized by X-ray crystallography.
A novel Schiff-base, N,N0 -di-(40 -pentyloxybenzoate)salicylidene-1,8-diamino-3,6-dioxaoctane (H2L4) with the mesogenic phase, nematic droplets, was prepared and its structure studied by mass, NMR and IR spectra. The Schiff base reacts with Zn(II) as a dinegative tetra-dentate species, giving rise to a non-mesogenic tetrahedral complex, [ZnL4]. The complex crystallizes in monoclinic P 21 =n which possesses screw axis and n-glide and also inherent twofold axis by the combination of these two symmetry operations. Considerable torsion has been observed between benzoate ring and salicylaldimine ring on either side of the metal atom.
Contents
B. Machura and J. Kusz Polyhedron 27 (2008) 187 Synthesis, spectroscopic characterisation, crystal and molecular structure of [ReOBr(quin-2-c)2] and [ReOCl(quin-2-c)2] complexes: DFT and TD-DFT calculations for [ReOBr(quin-2-c)2]
Feyyaz Durap, Nermin Biricik, ¨ zkar, Wee Han Ang, Bahattin Gu¨mgu¨m, Saim O Zhaofu Fei and Rosario Scopelliti Polyhedron 27 (2008) 196
Novel [ReOX(quin-2-c)2] complexes (X = Cl, Br; quin-2-c = quinoline-2-carboxylate ion) have been prepared by treatment of [ReOX3(AsPh3)2] with an excess of quinoline-2-carboxylic acid in acetonitrile. The complexes were characterised structurally and spectroscopically. The electronic structure of [ReOBr(quin-2-c)2] has been calculated with the density functional theory (DFT) method, and additional information about binding has been obtained by NBO analysis. The TD-DFT/ PCM calculations have been employed to produce a hundred of singlet excited-states, and UV–Vis spectrum of the [ReOBr(quin2-c)2] has been discussed on this basis.
Transition metal complexes (Cu, Pd, Pt) and chalcogenides of N,N-bis(diphenylphosphino)ethylaniline derivatives have been synthesized and characterized.
Synthesis and characterizations of N,N-bis(diphenylphosphino)ethylaniline derivatives and X-ray crystal structure of palladium (II), platinum (II) complexes
Xiao-Qing Shen, Hong-Chang Yao, Rui Yang, Zhong-Jun Li, Hong-Yun Zhang, Ben-Lai Wu and Hong-Wei Hou Polyhedron 27 (2008) 203 Synthesis, structure and thermal properties of polynuclear complexes with a new multidentate ligand, N,N0 -bis(5-ethyl-1,3,4-thiadiazol2-yl)-2,6-pyridinedicarboxamide
- akovic´, Zora Popovic´, Marijana D Gerald Giester and Masˇa Rajic´-Linaric´ Polyhedron 27 (2008) 210 Thiocyanate complexes of the group 12 metals with pyridine-2-carboxamide: Synthesis and structural characterization
Three polynuclear complexes based on N,N0 bis(5-ethyl-1,3,4-thiadiazol-2-yl)-2,6-pyridinedicarboxamide and inorganic ZnII and CdII salts were prepared and their structures were characterized by single-crystal X-ray analysis. The thermal stabilities of all the complexes and the thermal decomposition kinetics of complex 2 have been studied.
The three new heteroleptic thiocyanato complexes of zinc(II) (1), cadmium(II) (2) and mercury(II) (3) with picolinamide (pia) have been prepared, and their structures determined by X-ray crystallography. In all cases pia acts as a chelating ligand. Compound 1 forms two polymorphs of monomeric [Zn(SCN)2(pia)2] units. The structure of compound 2 comprises of polymeric [Cd(SCN)2(pia)]n and compound 3 of dimeric [Hg(SCN)2(pia)]2 units.
xi
xii
_ ¨ nal, Ahmet Karadag˘, Ibrahim O _ Ays¸egu¨l S¸enocak, Ibrahim Uc¸ar, Ahmet Bulut and Orhan Bu¨yu¨kgu¨ngo¨r Polyhedron 27 (2008) 223
Contents
Using Zn(hydeten)22+ or Cd(hydeten)22+ as bricks and [Pt(CN)4]2) anion as mortar, the novel binuclear one dimensional polymeric complexes 1 and 2 were prepared, and their structures were determined.
Syntheses, IR spectra, thermal properties and crystal structures of novel cyano-bridged polymeric complexes of zincII and cadmiumII with tetracyanoplatinateII
Zhi-Hua Li, Ping Lin and Shao-Wu Du Polyhedron 27 (2008) 232 Syntheses and characterization of three novel W(Mo)/Cu/S cluster-based layered polymers with 1,3,4-thiadiazole-2,5-dithiolate (SSS): Intriguing coordination modes of SSS Three novel 2D layered polymers, namely, [Et4N][WS3.5O0.5Cu3(CN)0.5(SSSH0.5)] (1), [Et4N][WS4Cu3(SSS)] (2) and [Et4N]2[MoS4Cu4(CN)(SSSH0.5)2] (3) have been prepared by solvothermal reactions of H2SSS (H2SSS =
Niraj Kumari, Rishikesh Prajapati and Lallan Mishra Polyhedron 27 (2008) 241 Reactivity of M(en)Cl2 (M = PdII/PtII, en = 1,2-diaminoethane) with N,N0 -bis(salicylidene)-p-phenylenediamine: Binding with hexafluorobenzene
Hassan Hadadzadeh, S. Jamil A. Fatemi, Seyedeh Raziyeh Hosseinian, Hamid Reza Khavasi and Rainer Po¨ttgen Polyhedron 27 (2008) 249 Synthesis, structure, spectroscopic, magnetic and electrochemical studies of a rare syn–anti acetate-bridged copper(II) complex
1,3,4-thiadiazole-2,5-dithiolate) with CuCN and [WOS3CuCN]2) or [W(Mo)S4]2) in organic solvents. In these complexes, the nestshaped {WS(O)S3Cu3} core in 1, the T-shaped {WS4Cu3} core in 2 and the saddle-shaped {MoS4Cu4} subunit in 3 serve as metal nodes whereas the SSS ligands function as multidentate linkers. The SSS ligand in both 1 and 2 coordinates to five Cu atoms via its exocyclic sulfur and endocyclic nitrogen atoms in an unprecedented fashion, while in 3, it acts as a rare tridentate ligand to connect three Cu atoms. Complexes 1–3 show optical transitions with band gaps of 1.90–2.24 eV.
S4/O1 N1/C11
S2
W1 S3
Cu3
Cu2b
Cu2 S5
S1 Cu1
S6
C1 N2
C2
N3
S7
S5a Cu1a
Cu2a
Cu3a
Part of the double chain in the anion of 1
The tetradentate Schiff base N,N0 -bis(salicylidene)-p-phenylenediamine upon its complexation with Pd(en)Cl2 and Pt(en)Cl2 provides two different products. In the case of the PtII complex, (2 + 2) condensation provides a metallocyclophane which is found to bindan electron acceptor molecule like hexafluorobenzene, as monitored spectroscopically.
The structure, spectroscopy and electrochemical properties of a novel dinuclear copper(II) complex, [{Cu(phen)2}2(l-CH3COO)][PF6]3, is reported. The crystal structure contains two independent Cu(II) ions with different geometries around each copper center which are bridged by an acetate anion. The acetate bridging ligand between the two Cu(II) centers shows a syn–anti coordination mode with a trigonal bipyramidal geometry for the Cu(1) center and a distorted square-based pyramidal geometry for the Cu(2) center.
P3
P2 N7 Cu2 N8
O2
O1 N3
N6
Cu1
N5
N2 N1 N4
P1
Contents
Vadapalli Chandrasekhar, Balasubramanian Murugesa Pandian and Ramachandran Azhakar Polyhedron 27 (2008) 255 Synthesis, structure and metallation of spiroN3P3(O2C12H8)(OC5H4N-2)4: A heptacoordinate Co(II) in the molecular structure of N3P3(O2C12H8)(OC5H4N-2)4 Æ Co(NO3)2
Susan A. Bourne and Lesego J. Moitsheki Polyhedron 27 (2008) 263 Hybrid inorganic–organic layered structures of [AuCl4]) and protonated bipyridyl derivatives
Pavel Drabina, Petr Valenta, Petr Jansa, Alesˇ Ru˚zˇicˇka, Jirˇ´ı Hanusek and Milosˇ Sedla´k Polyhedron 27 (2008) 268 Copper(II) complexes derived from substituted 2,20 -bis-(4-isopropyl-4-methyl-4,5-dihydro-1Himidazol-5-one) ligands: Synthesis, structure and catalytic activity
E. Manoj and M.R. Prathapachandra Kurup Polyhedron 27 (2008) 275 Structural and spectral studies of nickel(II) complexes with N(4),N(4)-(butane-1,4-diyl) thiosemicarbazones Nickel(II) complexes of quinoline-2-carbaldehyde N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL1) and 2-benzoylpyridine N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL2) were synthesized and physico-chemically characterized by means of partial elemental analyses, molar conductance
Spiro-N3P3(O2C12H8)(OC5H4N-2)4 (L) is an efficient multi-site coordination ligand which binds with transition metal ions to afford the mononuclear complexes [LCu(NO3)2], [LCo(NO3)2] and [LZnCl2]. The ligand L shows diverse coordination behavior towards these metal ions.
Complexes of [AuCl4]) with 4,40 -dipyridylethane, 4,40 -dipyridylethene and 4,40 -bipyridine-N,N0 -dioxide form hybrid organic– inorganic layered structures. The dipyridyl derivatives are stabilized by N–H Cl and Au Cl interactions. In the complex with and 4,40 -bipyridine-N,N0 -dioxide the organic layers consist of hydrogen-bonded bipyridyldioxide cations, with a short O–H O contact.
New chiral N,N-bidentate ligands derived from substituted 2,20 -bis-(4-isopropyl-4methyl-4,5-dihydro-1H-imidazol-5-one) have been prepared and characterised by means of 1 H and 13C NMR spectroscopy and optical rotation. Their Cu(II) complexes have been prepared and their structures have been studied by computational methods and by X-ray diffraction. The catalytic activity of some complexes have been studied.
measurements, magnetic measurements, electronic and infrared spectral studies. Three complexes were given the formulae [Ni(HL1)2]Cl2 (1), [Ni(HL2)L2]ClO4 Æ 7H2O (2) and [NiL2Cl] Æ 0.5H2O (3). The structure of compound 1 has been solved by single crystal X-ray crystallography and is found to be distorted octahedral. Compound 2, when crystallized in DMSO solution, got deprotonated to form a new compound [Ni(L2)2] (2a), with a distorted octahedral Ni(II) center. In compound 1, HL1 coordinates to the metal in the thione form, while in compounds 2a and 3, HL2 coordinates in its deprotonated thiolate form.
xiii
xiv
Zdenek Spichal, Vaclav Petricek, Jiri Pinkas and Marek Necas Polyhedron 27 (2008) 283 Two-dimensional lanthanide coordination polymers with bis(diphenylphosphino)hexane dioxide. The determination of the polymeric structure from twinned crystals
Athanassios C. Tsipis and Paraskevas A. Karipidis Polyhedron 27 (2008) 289 Deciphering the bonding mode of the trihalide ligands in a series of halogen carrier homoand hetero-trihalide Cu(II) Schiff base complexes
Jung Hak Lim, Houng Sik Yoo, Jung Hee Yoon, Eui Kwan Koh, Hyoung Chan Kim and Chang Seop Hong Polyhedron 27 (2008) 299 Structure and magnetic properties of cyanideV bridged NiII 9 Mo6 cluster modified by bidentate capping ligands
Sujittra Youngme, Jaturong Phatchimkun, Nanthawat Wannarit, Narongsak Chaichit, Siwaporn Meejoo, Gerard A. van Albada and Jan Reedijk Polyhedron 27 (2008) 304 New ferromagnetic dinuclear triply-bridged copper(II) compounds containing carboxylato bridges: Synthesis, X-ray structure and magnetic properties Six new triply-bridged dinuclear copper(II) complexes containing carboxylato bridges have been reported and their magnetic properties studied. A structural classification of this
Contents
Lanthanide salts and bis(diphenylphosphino)hexane dioxide (dpphO2) formed under solvothermal conditions coordination polymers [Ln(dpphO2)2(NO3)2](NO3) and [Ln(dpphO2)2Cl2]Cl, featuring two-dimensional network structures of the (4, 4) topology. The solution and refinement of the structures of the nitrate compounds was based on the data obtained on pseudo-merohedrally twinned crystals.
The molecular and electronic structure of the [Cu(RdienR)(X)(XY2)] complexes and their [Cu(RdienR)(X)2] precursors were analyzed in terms of charge decomposition analysis (CDA), natural bond orbital (NBO) population analysis, and percentage compositions of molecular orbitals in order to understand the nature of the bonding between the [XY2]) ligands and the Cu(II) central metal ion, and unveil the effect of coordination on the bonding mechanism in the coordinated [XY2]) ligands in comparison to that of the ‘‘free’’ [XY2]) anions.
A cyanide-bridged Ni9Mo6 cluster (1) capped with chelating bidentate ligands was prepared by self-assembling [Mo(CN)8]3), Ni2+, and bpy in a stoichiometric ratio. Compound 1 crystallized in the triclinic system with space group P 1 shows a body-centered Ni cube capped with six Mo entities. The non-covalent p–p stackings present in 1 lead to the extension of the molecule to a 2D sheet. Magnetic data exhibit that intracluster ferromagnetic interactions in 1 arise through the CN linkage coupled with zero-field splitting of the ground state.
type of dimers has been performed, based on the local five-coordinate geometry with different degrees of distortion and the relative arrangement of the two basal planes, giving rise to different classes (A–F) of complexes. The most logical explanations have been made for each class describing different magnetic interactions. Practically, the correlations between structural data and J values are found for some classes of complexes. Extended Hu¨ckel calculations were preformed for class B complexes, the results are found to be useful for the proper interpretation and correlation of the magnetic data and dimer structure of the present complexes.
Contents
Jong Hwa Jeong, Young Hun An, Youn K. Kang, Quang Trung Nguyen, Hyosun Lee and Bruce M. Novak Polyhedron 27 (2008) 319 Synthesis of polylactide using a zinc complex containing (S)-N-ethyl-N-phenyl-2-pyrrolidinemethanamine
The reaction between ZnCl2 and (S)-N-ethylN-phenyl-2-pyrrolidinemethanamine (S-EPP) as a chiral ligand affords [ZnCl2(S-EPP)], whose structure has been determined by X-ray crystallography. [ZnEt2(S-EPP)] has demonstrated high activity towards the polymerization of rac-lactide with a maximum turnover frequency (TOF) of 121. The observed heterotacticity was limited to under 0.6.
xv
. . .
.
. .
. N(2) .
N(1)
. .
.
Zn
.. Cl(2)
Cl(1)
Yan Z. Voloshin, Oleg A. Varzatskii, Alexander S. Belov, Zoya A. Starikova, Alexander V. Dolganov and Tatiana V. Magdesieva Polyhedron 27 (2008) 325 New antimony-capped iron(II) and cobalt(III) clathrochelate precursors of the polytopic hybrid cage complexes: Synthesis, X-ray structures and electrochemistry
Eula´lia Pereira, Lı´gia R. Gomes, John N. Low and Baltazar de Castro Polyhedron 27 (2008) 335 Synthesis, spectroscopic, electrochemical and structural characterization of Cu(II) complexes with asymmetric NN0 OS coordination spheres
Template macrocyclization on the iron(II) ion and the capping of K3CoDm3 complex with triethylantimony(V) derivatives afforded the triethylantimony-capped iron(II) and cobalt(III) tris-dimethylglyoximates, characterized using elemental analysis, mass, IR, UV– Vis, 57Fe Mo¨ssbauer, NMR spectroscopies, and X-ray crystallography. The cyclic voltammograms show oxidation and reduction waves assignable to Fe2+/3+ and Co2+/3+ couples.
Copper Schiff base complexes with N2OS coordination spheres were synthesized and characterized electrochemically and by EPR spectroscopy. The molecular and the crystal structure have been determined by X-ray diffractometry.
n N
R N
Cu O
S S
N
N
Cu S S
Ze-Li Yuan, Qi-Long Zhang, Xue Liang, Bi-Xue Zhu, Leonard F. Lindoy and Gang Wei Polyhedron 27 (2008) 344 A new series of dinucleating macrocyclic ligands and their complexes of zinc(II)
The metal template synthesis of a new category of dinucleating macrocyclic Schiff base ligands with ring sizes from 34- to 52-membered and their interaction with zinc(II) are reported.
O O
xvi
Contents
Eleni K. Efthimiadou, Alexandra Karaliota and George Psomas Polyhedron 27 (2008) 349 Mononuclear dioxomolybdenum(VI) complexes with the quinolones enrofloxacin and sparfloxacin: Synthesis, structure, antibacterial activity and interaction with DNA
Sachindranath Pal, Anil Kumar Barik, Samik Gupta, Somnath Roy, Tarak Nath Mandal, Arijit Hazra, Mohamed Salah El Fallah, Ray J. Butcher, Shie-Ming Peng, Gene-Hsiang. Lee and Susanta Kumar Kar Polyhedron 27 (2008) 357 Anion dependent formation of linear trinuclear mixed valance cobalt(III/II/III) complexes and mononuclear cobalt(III) complexes of a pyrazole derived ligand – Synthesis, characterization and X-ray structures
B. Machura and J. Kusz Polyhedron 27 (2008) 366 Reactivity of oxorhenium(V) complexes towards 8-hydroxyquinoline-2-carboxylic acid: X-ray structure of [ReOCl2(hquin-2-COOH)(AsPh3)] Æ MeCN and [ReOCl2(hquin-2COOH)(PPh3)] Æ MeCN complexes. DFT and TDDFT calculations for [ReOCl2(hquin-2COOH)(AsPh3)] The reactions of [ReOX3(EPh3)2] with 8-hydroxyquinoline-2-carboxylic acid (Hhquin-2COOH) have been examined and [Re-
Nand K. Singh, Mamata Singh, Pratibha Tripathi, Ajay K. Srivastava and Ray J. Butcher Polyhedron 27 (2008) 375 0
Synthesis of a new N,N -ethane-1,2-bis(4-methoxyphenyl)carbothioamide ligand and its Cu(I) and Ag(I) complexes
The synthesis, the characterization, the antibacterial activity and the interaction with calfthymus DNA of the neutral mononuclear dioxomolybdenum(VI) complexes with the quinolone antibacterial agents enrofloxacin and sparfloxacin are presented.
Co(II) mediated anion dependent Schiff base complex formation was studied. Depending upon the proportion of 5-methylpyrazole-3carbaldehyde (MPA), 1,3-diamino-2-propanol (DAP) and metal salts with different anions, two trinuclear linear pyrazolate bridged mixed valence Co(III/II/III) complexes and a few mononuclear Co(III) complexes were characterized.
OX2(hquin-2-COOH)(EPh3)] Æ MeCN (X = Cl, Br; E = As, P) complexes have been obtained. All the complexes were characterised by IR, UV–Vis spectroscopy and elemental analysis. The crystal and molecular structures have been determined for [ReOCl2(hquin-2-COOH)and [ReOCl2(hquin-2(AsPh3)] Æ MeCN COOH)(PPh3)] Æ MeCN. The electronic structure of [ReOCl2(hquin-2-COOH)(AsPh3)] has been calculated with the density functional theory (DFT) method, and TDDFT calculations have been employed to produce a hundred of singlet excited-states starting from the ground-state geometry optimized in the gas phase.
Complexes [M(H2L)(PPh3)2]NO3 Æ 0.5H2O, (M = Cu, Ag) formed with N, N0 -ethane-1,2bis(4-methoxyphenyl)carbothioamide (H2L) have MS2P2 coordination and the ligand is bonded through the sulfur atoms forming a nine-membered chelate ring. The molecular packing in the copper(I) complex is dominated by hydrogen bonding offered by the NO3 ion and the basal plane of the CuS2 chelate ring. The specific arrangement of two nitrate ions and two complex cations results in a rectangular shaped anionic channel.
Contents
Richard J. Bushby, Colin Kilner, Norman Taylor and Rhidian A. Williams Polyhedron 27 (2008) 383 Antiferromagnetic spin-coupling between MnII and amminium radical cation ligands: Models for coordination polymer magnets
Agnieszka Mech Polyhedron 27 (2008) 393 Crystal structure and optical properties of novel (N(C2H5)4)[Nd(hfa)4(H2O)] tetrakis complex
Zenixole R. Tshentu, Thomas I.A. Gerber, Ryan Walmsley and Peter Mayer Polyhedron 27 (2008) 406 Imidazole-based bifunctional chelates for the ‘‘fac-[Re(CO)3]+’’ core
Zdeneˇk Tra´vnı´cˇek, Richard Pastorek and Va´clav Slova´k Polyhedron 27 (2008) 411 Novel octahedral nickel(II) dithiocarbamates with bi- or tetradentate N-donor ligands: X-ray structures of [Ni(Bzppzdtc)(phen)2]ClO4 Æ CHCl3 and [Ni(Bz2dtc)2(cyclam)]
A series of novel octahedral nickel(II) dithiocarbamate complexes involving bidentate nitrogen-donor ligands (phen or bpy) or a
A one-electron oxidation converts the triarylamine ligand of the complex L2Mn(hfac)2 (L = 400 ,4000 -di-tert-butyl-20 ,200 ,2000 trimethoxy{4-(40 -diphenylaminophenyl)pyridine}) to the radical cation and gives an S = 2 system: J/kb = )1.5 K. A two-electron oxidation converts both triarylamine ligands to the radical cation; S = 3/2: J/kb = )0.3 K.
The novel [Nd(hfa)4(H2O)](N(C2H5)4) tetrakis complex has been synthesized and characterized using X-ray, DSC. An absorption spectrum of the single crystal were recorded and parameterized in terms of Judd-Ofelt theory.
This paper presents the syntheses of tridentate bis-imidazole type ligands, and the study of their coordination chemistry with [Re(OH2)3(CO)3]Br or (NEt4)2[ReBr3(CO)3] as Re(I) precursor compounds. Crystal structure evidence for one of the analogues shows that the tridentate ligand adopts a facial arrangement around the Re(I) ion, imposed by the fac-[Re(CO)3]+ core.
tetradentate ligand (cyclam) of the composition [Ni(BzMetdtc)(phen)2]ClO4 (1), [Ni(Pe2dtc)(phen)2]ClO4 (2), [Ni(Bzppzdtc)(phen)2]ClO4 Æ CHCl3 (3), [Ni(Bzppzdtc)(phen)2](SCN) (4), [Ni(BzMetdtc)(bpy)2]ClO4 Æ 2H2O (5), [Ni(Pe2dtc)(cyclam)]ClO4 (6), [Ni(BzMetdtc)2(cyclam)] (7), [Ni(Bz2dtc)2(cyclam)] (8) and [Ni(Bz2dtc)2(phen)] (9) have been synthesized. Broad spectrum of physical techniques, including X-ray analysis of 3 and 8, proved the octahedral geometry in the vicinity of the nickel atom in all cases. The catalytic influence of complexes 2, 3, 6, and 7 on graphite oxidation was studied and discussed.
xvii
xviii
Polyhedron 27 (2008) 420 Syntheses, characterizations and crystal structures of monomeric or macrocyclic compounds of di- or triorganotin (IV) moieties with 4,40 -thiodibenzenethiol Six organotin compounds with 4,40 -thiodibenzenethiol (LH2) of type RnSnL4)nSnRn (n = 3: R = Me 1, Ph 2, PhCH2 3, n = 2: R = Me 4, Ph 5, PhCH2 6) have been synthesized. All compounds were characterized by elemental analysis, IR and NMR (1H, 13C,
I.M. Ali, E.S. Zakaria, M.M. Ibrahim and I.M. El-Naggar Polyhedron 27 (2008) 429 Synthesis, structure, dehydration transformations and ion exchange characteristics of ironsilicate with various Si and Fe contents as mixed oxides
119
Sn) spectra. The structures of compounds 1, 2, 4, 5 and 6 were also determined by X-ray diffraction analysis, which revealed that compounds 1 and 2 were monomeric structures, compounds 4, 5 and 6 were centrosymmetric dinuclear macrocyclic structures, all the tin(IV) atoms are four-coordinated. Furthermore, supramolecular structures were also found in compounds 1, 2, 4, 5 and 6, which exist one-dimensional chains, two-dimensional networks or three-dimensional structure through intermolecular C–H S weak hydrogen bonds (WHBs), non-bonded Sn S interactions or C–H p interactions.
Iron silicate was obtained from iron oxide impregnated with silica in different Fe/Si molar ratios. Kinetics of dehydration transformation indicated a 1st order process for different silicate ratios. Application of the materials as ion exchangers showed a high affinity for ions of different charges on increasing the solution pH as well as with the silica content increasing.
HS
S
SH
+
C6H6
2R 3SnCl
R3SnS
EtONa
SSnR 3
S
R=Me 1, Ph 2, PhCH 2 3
S R HS
C6H6 EtONa
SH + R 2SnCl 2
S
S
S
S
S
Sn R
R Sn R
S R=Me 4, Ph 5, PhCH 2 6
4
3
log K d
Chun-Lin Ma, Zhi-Fo Guo and Ru-Fen Zhang
Contents
2
Fe S i - II
C s+ N a+
1
C o2+ C e3+
0 1
2
3
4
5
pH
Tu¨lay Bal-Demirci Polyhedron 27 (2008) 440 Synthesis, spectral characterization of the zinc(II) mixed-ligand complexes of N(4)-allyl thiosemicarbazones and N,N,N0 ,N0 -tetramethylethylenediamine, and crystal structure of the novel [ZnL2(tmen)] compound
Dohyun Moon, Junghyun Kim, Minhak Oh, Byoung Jin Suh and Myoung Soo Lah Polyhedron 27 (2008) 447 Synthesis and characterization of a bis-l,g1carboxylate-bridged dinuclear manganese(II) complex containing a tetradentate tripodal ligand, N-(benzimidazol-2-ylmethyl)iminodiacetic acid
Mixed-ligand zinc complexes with N,N,N,N0 tetramethylethylenediamine (tmen) and Rsalicylaldehyde N(4)-allyl thiosemicarbazones (R: 3-OCH3 (L1), 5-Br(L2)), [ZnL1,2(tmen)], were synthesized and the complexes were characterized by elemental, spectral and single crystal analysis. Crystal of [ZnL2(tmen)] have a slightly distorted square pyramid involving O, N, S atoms of thiosemicarbazone and one N atom of tmen in basal plane and the other N atom of tmen in apex of the pyramid. The noncoordinated allyl group is disordered.
A dinuclear manganese(II) complex has been prepared using a tripodal ligand, where the complex mimics several important structural features of the manganese arginase core, such as the simultaneous presence of both l,g1 bridging carboxylate and non-bridging monodentate carboxylate binding modes, and an intramolecular hydrogen bond involving a coordinated water molecule.
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Sebusi Odisitse and Graham E. Jackson Polyhedron 27 (2008) 453 In vitro and in vivo studies of N,N0 -bis[2(2-pyridyl)-methyl]pyridine-2,6-dicarboxamide– copper(II) and rheumatoid arthritis
- akovic´, Zora Popovic´, Marijana D Gerald Giester and Masˇa Rajic´-Linaric´ Polyhedron 27 (2008) 465 Synthesis, spectroscopic and structural investigation of Zn(NCS)2(nicotinamide)2 and [Hg(SCN)2(nicotinamide)]n
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Copper complexes of N,N0 -bis[2(2-pyridyl)methyl]pyridine-2,6-dicarboxamide have been evaluated as potential anti-inflammatory agents using potentiometry, biophysical measurements and animal studies.
The nicotinamido (nia) complexes of the thiocyanates of zinc (1) and mercury(II) (2) were prepared and spectroscopically and thermally characterized, and their structures were determined by X-ray crystallography. The nia ligand acts as a monodentate ligand through the pyridine nitrogen. Compound 1 comprises of monomeric [Zn(SCN)2(nia)2], while compound 2 of polymeric [Hg(SCN)2(nia)]n units. Centrosymmetric H-bond dimers of R22(10) type in 1 and of R22(8) type in 2 are formed.
Corrigendum to ‘‘Three novel trinuclear zinc(II)/nickel(II) complexes with pentadentate ligands N-nitrobenzoylsalicylhydrazidate’’ [Polyhedron 26 (2007) 4793–4798]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
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