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prelims, contents pages
Polyhedron 29, issue 17, 18 November 2010
Contents lists available at ScienceDirect
Polyhedron journal homepage: www.elsevier.com/locate/poly
Contents Research Papers Mrinal Kanti Paira, Tapan Kumar Mondal, Elena López-Torres, Joan Ribas and Chittaranjan Sinha Polyhedron 29 (2010) 3147 Copper(II) complexes of thioarylazo-pentanedione: Structures, magnetism, redox properties and correlation with DFT calculations
Sandipan Sarkar, Supriti Sen, Sourav Dey, Ennio Zangrando and Pabitra Chattopadhyay Polyhedron 29 (2010) 3157 Coordination behavior of 3,4-bis(2-pyridylmethylthio)toluene with copper(II) ions: Synthesis, structural characterization and reactivity, and DNA binding study of the dinuclear copper(II) complex
The coordination behavior of a newly designed tetradentate N2S2 ligand 3,4bis(2-pyridylmethylthio)toluene (L) to-
K.R. Jisha, S. Suma and M.R. Sudarsanakumar Polyhedron 29 (2010) 3164 Synthesis and spectral characterization of alkaline earth metal complexes: Crystal structure of a Ca(II) hippuric acid complex
Elsevier Ltd.
Copper(II)-3-(2-(alkylthio)-2-phenylazo)2,4-pentanedione complexes are reported using Cl) or SCN) as a coligand. A Clbridged polymer and –NCS-bridged dimer are established by a single crystal X-ray diffraction study. The complexes show antiferromagnetic interactions, with J = )0.5 ± 0.1 cm)1 (1a) and )25.8 ± 0.5 cm)1 (2b), which implies stronger coupling in the –SCN-bridging compound. The spectra, redox and magnetism are explained by DFT and TD-DFT studies.
wards different copper(II) salts has been studied. The resulting complexes are dependent on the counter anion of copper(II) salts used as reactant and on the reaction medium. Copper(II) perchlorate leads to the formation of a dinuclear copper(II) complex in acetonitrile but dinuclear copper(I) complex in methanol showing the reducing behavior of the solvent. In methanol it was observed the slowly conversion of the dinuclear copper(II) species to copper(I), whereas the process proceeds faster in acetonitrile in presence of catechol.
Alkaline earth metal complexes of hippuric acid have been synthesized and characterized. One of the complexes, [Ca(hip)2(H2O)2]ÆH2O, was characterized by single crystal X-ray diffraction studies. The hippurate anion functions as a bidentate ligand and is linked to calcium through the oxygen atoms of the carboxylate groups, one of which is bridging, forming a two dimensional coordination polymer.
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Dibakar Sardar, Papia Datta, Partha Mitra and Chittaranjan Sinha Polyhedron 29 (2010) 3170 Rhodium(III) and iridium(III) complexes of thioarylazoimidazoles: Synthesis, structure, spectral characterization, electrochemistry and DFT calculation
Ali Akbar Khandar, Ray J. Butcher, Marjan Abedi, Seyed Abolfazl Hosseini-Yazdi, Mehmet Akkurt and M. Nawaz Tahir Polyhedron 29 (2010) 3178 Synthesis, characterization and crystal structures of dinuclear macrocyclic Schiff base copper(I) complexes bearing different bridges
Rupam Sen, Dipak K. Hazra, Subratanath Koner, Madeleine Helliwell, Monika Mukherjee and Ashis Bhattacharjee Polyhedron 29 (2010) 3183 Hydrothermal synthesis of dimeric lanthanide compounds: X-ray structure, magnetic study and heterogeneous catalytic epoxidation of olefins
Nanhai Singh, Kiran Diwan and Michael G.B. Drew Polyhedron 29 (2010) 3192 Supramolecular assemblies of metal ions in complex bimetallic and trimetallic salts based on hexacyanoferrate(III) ion
Contents
1-Alkyl-2-{(o-thioalkyl)phenylazo} imidazole) complexes, [M(SRaaiNR0 )Cl3] (M = Rh(III), Ir(III)) are described. [Rh(SMeaaiNEt)Cl3] (3b) has been characterized by single crystal X-ray spectroscopy. The ligand acts as tridentate, with N(imidazole), N(azo) and S(thioether) donor centres. Spectral characterizations have been carried out with IR, UV–Vis and 1 H NMR data. The electronic structure, redox properties and observed electronic transitions are well supported by DFT and TDDFT computations on the complexes.
The synthesis, characterization and crystal structures of three dinuclear Cu(I) complexes of a 20-membered [2+2] macrocyclic, N4 donor, Schiff base ligand, containing different halogen bridges are described. The stacking and hydrogen bonds of the crystal structures and the role of bridging groups in controlling the Cu Cu separation have been investigated.
A series of dimeric lanthanide carboxylato complexes [La(5-Br-NIC)3(H2O)2]2ÆH2O (1); [Gd(5-Br-NIC)3(H2O)2]2 (2), [5-Br-NIC = 5bromonicotinate] and [Sm(NIC)3(H2O)2]2 (3) [NIC = nicotinate], have been hydrothermally synthesized and structurally characterized. All the compounds exhibit excellent catalytic performance in olefin epoxidation reaction. The variable temperature magnetic susceptibility measurements showed that the magnetic interaction in [Gd(5-Br-NIC)3(H2O)2]2 (2), is antiferromagnetic (J = )0.048 cm)1).
Two new low spin supramolecular assemblies Tl6[Fe(CN)6]1.33(NO3)(OH) (1) and [Co(bpy)2(CN)2]2{[Ag(CN)2]0.5[Fe(CN)6]0.5}Æ 8H2O (2) using [Fe(CN)6]3) units as one of the building blocks have been synthesized, characterized and photoluminescent behavior studied. Both complexes form unprecedented three-dimensional supramolecular networks via non-covalent interactions: water molecules present in 2 plays important role in providing stability, thereby organizing a supramolecular network through hydrogen bonding.
Contents
J.G. Małecki, A. S´witlicka, T. Gron´ and M. Bałanda Polyhedron 29 (2010) 3198 Correlation between crystal symmetry and the splitting of d orbital in the thiocyanate nickel(II) complexes New [Ni(SCN)2(L)4/2] complexes, where L = py (1), c-pic (2), pyCH2OH (3), py(CH2)3OH (4) were synthesized in simple reactions of NiCl2Æ6H2O with ammonia thiocyanate and pyridine type ligands in methanol solutions. Blue crystals of [Ni(SCN)2(py)4] (1), [Ni(SCN)2(pyCH2OH)2] (3) and [Ni(SCN)2(py(CH2)3OH)2] (4)
Zhao-Peng Deng, Li-Hua Huo, Li-Na Zhu, Hui Zhao and Shan Gao Polyhedron 29 (2010) 3207 Syntheses, structures, and properties of silver(I) polymeric architectures assembled by [2+2] or [2+3] metallomacrocyclic motif and angular ligands
Mousa Al-Noaimi, Basem F. Ali, Abdel Monem Rawashdeh and Zaher Judeh Polyhedron 29 (2010) 3214 X-ray structure, electronic properties and density functional calculations: trans-Dihalo (1-(4-phenylimino)-1-(phenylhydrazono)-propan-2-one) (4,40 -di-tert-butyl-2,2-bipyridine) ruthenium(II) complexes The reaction of RuX3 (X = CI, Br, I) with arylazoimine (PhN@NC(COCH3)@NPh, Az) and (4,40 -di-tert-butyl-2,2-bipyridine, dtb) in refluxing ethanol affords a trans-[Ru(Az)(dtb)X2].
_ ¸og˘lu, Adem Kılıç, Serap Bes¸ li, Hanife Ibis _ Ilker Ün and Fatma Yuksel Polyhedron 29 (2010) 3220 Spiro, ansa-derivatives of cyclotetraphosphazenes with a tetrafluorobutane-1,4-diol
crystallize in the monoclinic system, blue crystal of [Ni(SCN)2(c-pic)4] (2) – in the tetragonal one, and red crystal of [Ni(SCN)2(PPh3)2] (5) – in the triclinic one. The ligands of complexes (1) and (3) were indicated as rather strong p-acceptors while that of complex (4) one has some p-donor properties. When the aliphatic chain (CH2) elongates in the sequence: (1), (3) and (4), an increase in the orbital contribution to the magnetic moment and a decrease in the 10Dq value of the d orbital splitting are related to the change of the point group symmetry from D2h, via D2v to C2h.
Four new silver(I) architectures were constructed from [2+2] or [2+3] metallomacrocyclic motif and angular oxime-imine and bipyridyl ligands. They exhibited intraligand emission bands in the blue, green and purple light region at room temperature, respectively.
These complexes have been characterized through spectroscopic (IR, UV/Vis, and NMR) and electrochemical (CV) techniques. The complex trans-[Ru(Az)(dtb)Cl2] has been X-ray crystallographically characterized. The crystals belong to the rhombohedral space group R3. The two chlorine atoms are trans to each other. These complexes display a cyclic voltammetric one-electron metal oxidation peak in acetonitrile near 1.2 V versus NHE. The electronic absorption spectra of these complexes show a strong band in the visible region which is assigned to a (Ru(II)-to-azomethine) MLCT transition based on TD-DFT calculations.
Geometrical isomers (cis- and trans-bisspiro) and novel spiro-ansa compound (mono-spiro-bis-ansa) were obtained from the reaction of cyclotetraphosphazene with fluorinated butanediol.
v
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Eva H. Mørkved, Trygve Andreassen, Roland Fröhlich, Frode Mo and Per Bruheim Polyhedron 29 (2010) 3229 Unsymmetrical zinc azaphthalocyanines, peripherally substituted with thiophen-2-yl and 2functionalized phenoxy groups
Mohan N. Patel, Promise A. Dosi and Bhupesh S. Bhatt Polyhedron 29 (2010) 3238 Antibacterial, DNA interaction and superoxide dismutase activity of drug based copper(II) coordination compounds
Mohammad Mahdi Najafpour, Davar M. Boghaei and Vickie McKee Polyhedron 29 (2010) 3246 Synthesis, characterization, crystal structure and oxygen-evolution activity of a manganese(II) complex with 2,4,6-tris (2-pyridyl)-1,3,5triazine
Sovan Roy, Sounik Saha, Ritankar Majumdar, Rajan R. Dighe and Akhil R. Chakravarty Polyhedron 29 (2010) 3251 Photo-activated cytotoxicity of a pyrenyl-terpyridine copper(II) complex in HeLa cells
Contents
Four octasubstituted zinc azaphthalocyanines with combinations of thiophen-2-yl and 2-substituted phenoxy groups have been synthesized and characterized. These complexes give green solutions and are easily soluble in most organic solvents. Four tetra-aryloxy substituted ZnAzaPc were synthesized as control substances. These compounds are less soluble in organic solvents and give blue-green solutions.
Octahedral geometry at the centre provide binding site for scavenging superoxide anion. Increase in antibacterial activity results from chelation effect provided by drug and neutral tridentate ligand.
Crystal structure of [Mn(tptz)(CH3COO)(OH2)2]NO3 has been obtained. Elemental analysis, electrochemistry, IR, EPR, UV–Vis and fluorescence emission spectra for the complex have also been determined. Reactions between oxone and the manganese complex led to oxygen-evolution.
Terpyridine copper(II) complexes [Cu(L)2](NO3)2 having pendant phenyl group in 1 and pyrenyl group in 2 are intercalative DNA binders. The pyrenyl-terpyridine complex 2 shows visible light-induced DNA cleavage via 1O2 pathway and exhibits photocytotoxicity in HeLa cancer cells giving IC50 value of 11.9 lM, while being essentially non-cytotoxic in dark.
O
R
R1 N
N
R
N
N N N N O
R = H or
N N N
N N
R
S R1
N Zn
N R1
O N
R
N R1
O
R1 = H OCH(CH3 )2 CH(CH 3) 2 C(CH3 )3
Contents
Swamy Maloth and Samudranil Pal Polyhedron 29 (2010) 3257 Copper(II) complexes with 2-[(2-pyridin-2-ylethylimino)-methyl]-phenol and its substituted derivatives: Syntheses, physical properties and structures
Amit Deshmukh, Anil Kinage, Rajiv Kumar and Reinout Meijboom Polyhedron 29 (2010) 3262 An efficient heterogeneous catalytic system for chemoselective hydrogenation of unsaturated ketones in aqueous medium
Syntheses, properties and structures of a series of copper(II) complexes having the formula [CuL(OAc)] (HL = n-R-2-[(2-pyridin-2-yl-ethylimino)-methyl]-phenol (R = H, Br, NO2 and OMe when n = 4 and R = OMe when n = 5)) are reported. The metal center in these complexes is in irregular N2O3 coordination sphere assembled by the N,N,O-donor L) and the bidentate acetate. One of the complexes (R = Br) forms dimeric units due to a pair of reciprocal Cu Br interactions.
A highly chemoselective (>99%) and green catalytic system for the chemoselective hydrogenation of unsaturated ketones to unsaturated alcohols, immobilized Ru(Phen)n complexes on MCM-41 materials, is demonstrated in aqueous medium. The catalyst was successfully recycled for the hydrogenation of unsaturated ketones.
The Publisher encourages the submission of articles in electronic form thus saving time and avoiding rekeying errors. For detailed instructions on the preparation of manuscripts and of electronic artwork, consult the Author Gateway for Elsevier at http://authors.elsevier.com
Full text of this journal is available, on-line from ScienceDirect. Visit www.sciencedirect.com for more information.
vii
Contents lists available at ScienceDirect
Polyhedron journal homepage: www.elsevier.com/locate/poly
Contents Research Papers Mrinal Kanti Paira, Tapan Kumar Mondal, Elena López-Torres, Joan Ribas and Chittaranjan Sinha Polyhedron 29 (2010) 3147 Copper(II) complexes of thioarylazo-pentanedione: Structures, magnetism, redox properties and correlation with DFT calculations
Sandipan Sarkar, Supriti Sen, Sourav Dey, Ennio Zangrando and Pabitra Chattopadhyay Polyhedron 29 (2010) 3157 Coordination behavior of 3,4-bis(2-pyridylmethylthio)toluene with copper(II) ions: Synthesis, structural characterization and reactivity, and DNA binding study of the dinuclear copper(II) complex
The coordination behavior of a newly designed tetradentate N2S2 ligand 3,4bis(2-pyridylmethylthio)toluene (L) to-
K.R. Jisha, S. Suma and M.R. Sudarsanakumar Polyhedron 29 (2010) 3164 Synthesis and spectral characterization of alkaline earth metal complexes: Crystal structure of a Ca(II) hippuric acid complex
Elsevier Ltd.
Copper(II)-3-(2-(alkylthio)-2-phenylazo)2,4-pentanedione complexes are reported using Cl) or SCN) as a coligand. A Clbridged polymer and –NCS-bridged dimer are established by a single crystal X-ray diffraction study. The complexes show antiferromagnetic interactions, with J = )0.5 ± 0.1 cm)1 (1a) and )25.8 ± 0.5 cm)1 (2b), which implies stronger coupling in the –SCN-bridging compound. The spectra, redox and magnetism are explained by DFT and TD-DFT studies.
wards different copper(II) salts has been studied. The resulting complexes are dependent on the counter anion of copper(II) salts used as reactant and on the reaction medium. Copper(II) perchlorate leads to the formation of a dinuclear copper(II) complex in acetonitrile but dinuclear copper(I) complex in methanol showing the reducing behavior of the solvent. In methanol it was observed the slowly conversion of the dinuclear copper(II) species to copper(I), whereas the process proceeds faster in acetonitrile in presence of catechol.
Alkaline earth metal complexes of hippuric acid have been synthesized and characterized. One of the complexes, [Ca(hip)2(H2O)2]ÆH2O, was characterized by single crystal X-ray diffraction studies. The hippurate anion functions as a bidentate ligand and is linked to calcium through the oxygen atoms of the carboxylate groups, one of which is bridging, forming a two dimensional coordination polymer.
iv
Dibakar Sardar, Papia Datta, Partha Mitra and Chittaranjan Sinha Polyhedron 29 (2010) 3170 Rhodium(III) and iridium(III) complexes of thioarylazoimidazoles: Synthesis, structure, spectral characterization, electrochemistry and DFT calculation
Ali Akbar Khandar, Ray J. Butcher, Marjan Abedi, Seyed Abolfazl Hosseini-Yazdi, Mehmet Akkurt and M. Nawaz Tahir Polyhedron 29 (2010) 3178 Synthesis, characterization and crystal structures of dinuclear macrocyclic Schiff base copper(I) complexes bearing different bridges
Rupam Sen, Dipak K. Hazra, Subratanath Koner, Madeleine Helliwell, Monika Mukherjee and Ashis Bhattacharjee Polyhedron 29 (2010) 3183 Hydrothermal synthesis of dimeric lanthanide compounds: X-ray structure, magnetic study and heterogeneous catalytic epoxidation of olefins
Nanhai Singh, Kiran Diwan and Michael G.B. Drew Polyhedron 29 (2010) 3192 Supramolecular assemblies of metal ions in complex bimetallic and trimetallic salts based on hexacyanoferrate(III) ion
Contents
1-Alkyl-2-{(o-thioalkyl)phenylazo} imidazole) complexes, [M(SRaaiNR0 )Cl3] (M = Rh(III), Ir(III)) are described. [Rh(SMeaaiNEt)Cl3] (3b) has been characterized by single crystal X-ray spectroscopy. The ligand acts as tridentate, with N(imidazole), N(azo) and S(thioether) donor centres. Spectral characterizations have been carried out with IR, UV–Vis and 1 H NMR data. The electronic structure, redox properties and observed electronic transitions are well supported by DFT and TDDFT computations on the complexes.
The synthesis, characterization and crystal structures of three dinuclear Cu(I) complexes of a 20-membered [2+2] macrocyclic, N4 donor, Schiff base ligand, containing different halogen bridges are described. The stacking and hydrogen bonds of the crystal structures and the role of bridging groups in controlling the Cu Cu separation have been investigated.
A series of dimeric lanthanide carboxylato complexes [La(5-Br-NIC)3(H2O)2]2ÆH2O (1); [Gd(5-Br-NIC)3(H2O)2]2 (2), [5-Br-NIC = 5bromonicotinate] and [Sm(NIC)3(H2O)2]2 (3) [NIC = nicotinate], have been hydrothermally synthesized and structurally characterized. All the compounds exhibit excellent catalytic performance in olefin epoxidation reaction. The variable temperature magnetic susceptibility measurements showed that the magnetic interaction in [Gd(5-Br-NIC)3(H2O)2]2 (2), is antiferromagnetic (J = )0.048 cm)1).
Two new low spin supramolecular assemblies Tl6[Fe(CN)6]1.33(NO3)(OH) (1) and [Co(bpy)2(CN)2]2{[Ag(CN)2]0.5[Fe(CN)6]0.5}Æ 8H2O (2) using [Fe(CN)6]3) units as one of the building blocks have been synthesized, characterized and photoluminescent behavior studied. Both complexes form unprecedented three-dimensional supramolecular networks via non-covalent interactions: water molecules present in 2 plays important role in providing stability, thereby organizing a supramolecular network through hydrogen bonding.
Contents
J.G. Małecki, A. S´witlicka, T. Gron´ and M. Bałanda Polyhedron 29 (2010) 3198 Correlation between crystal symmetry and the splitting of d orbital in the thiocyanate nickel(II) complexes New [Ni(SCN)2(L)4/2] complexes, where L = py (1), c-pic (2), pyCH2OH (3), py(CH2)3OH (4) were synthesized in simple reactions of NiCl2Æ6H2O with ammonia thiocyanate and pyridine type ligands in methanol solutions. Blue crystals of [Ni(SCN)2(py)4] (1), [Ni(SCN)2(pyCH2OH)2] (3) and [Ni(SCN)2(py(CH2)3OH)2] (4)
Zhao-Peng Deng, Li-Hua Huo, Li-Na Zhu, Hui Zhao and Shan Gao Polyhedron 29 (2010) 3207 Syntheses, structures, and properties of silver(I) polymeric architectures assembled by [2+2] or [2+3] metallomacrocyclic motif and angular ligands
Mousa Al-Noaimi, Basem F. Ali, Abdel Monem Rawashdeh and Zaher Judeh Polyhedron 29 (2010) 3214 X-ray structure, electronic properties and density functional calculations: trans-Dihalo (1-(4-phenylimino)-1-(phenylhydrazono)-propan-2-one) (4,40 -di-tert-butyl-2,2-bipyridine) ruthenium(II) complexes The reaction of RuX3 (X = CI, Br, I) with arylazoimine (PhN@NC(COCH3)@NPh, Az) and (4,40 -di-tert-butyl-2,2-bipyridine, dtb) in refluxing ethanol affords a trans-[Ru(Az)(dtb)X2].
_ ¸og˘lu, Adem Kılıç, Serap Bes¸ li, Hanife Ibis _ Ilker Ün and Fatma Yuksel Polyhedron 29 (2010) 3220 Spiro, ansa-derivatives of cyclotetraphosphazenes with a tetrafluorobutane-1,4-diol
crystallize in the monoclinic system, blue crystal of [Ni(SCN)2(c-pic)4] (2) – in the tetragonal one, and red crystal of [Ni(SCN)2(PPh3)2] (5) – in the triclinic one. The ligands of complexes (1) and (3) were indicated as rather strong p-acceptors while that of complex (4) one has some p-donor properties. When the aliphatic chain (CH2) elongates in the sequence: (1), (3) and (4), an increase in the orbital contribution to the magnetic moment and a decrease in the 10Dq value of the d orbital splitting are related to the change of the point group symmetry from D2h, via D2v to C2h.
Four new silver(I) architectures were constructed from [2+2] or [2+3] metallomacrocyclic motif and angular oxime-imine and bipyridyl ligands. They exhibited intraligand emission bands in the blue, green and purple light region at room temperature, respectively.
These complexes have been characterized through spectroscopic (IR, UV/Vis, and NMR) and electrochemical (CV) techniques. The complex trans-[Ru(Az)(dtb)Cl2] has been X-ray crystallographically characterized. The crystals belong to the rhombohedral space group R3. The two chlorine atoms are trans to each other. These complexes display a cyclic voltammetric one-electron metal oxidation peak in acetonitrile near 1.2 V versus NHE. The electronic absorption spectra of these complexes show a strong band in the visible region which is assigned to a (Ru(II)-to-azomethine) MLCT transition based on TD-DFT calculations.
Geometrical isomers (cis- and trans-bisspiro) and novel spiro-ansa compound (mono-spiro-bis-ansa) were obtained from the reaction of cyclotetraphosphazene with fluorinated butanediol.
v
vi
Eva H. Mørkved, Trygve Andreassen, Roland Fröhlich, Frode Mo and Per Bruheim Polyhedron 29 (2010) 3229 Unsymmetrical zinc azaphthalocyanines, peripherally substituted with thiophen-2-yl and 2functionalized phenoxy groups
Mohan N. Patel, Promise A. Dosi and Bhupesh S. Bhatt Polyhedron 29 (2010) 3238 Antibacterial, DNA interaction and superoxide dismutase activity of drug based copper(II) coordination compounds
Mohammad Mahdi Najafpour, Davar M. Boghaei and Vickie McKee Polyhedron 29 (2010) 3246 Synthesis, characterization, crystal structure and oxygen-evolution activity of a manganese(II) complex with 2,4,6-tris (2-pyridyl)-1,3,5triazine
Sovan Roy, Sounik Saha, Ritankar Majumdar, Rajan R. Dighe and Akhil R. Chakravarty Polyhedron 29 (2010) 3251 Photo-activated cytotoxicity of a pyrenyl-terpyridine copper(II) complex in HeLa cells
Contents
Four octasubstituted zinc azaphthalocyanines with combinations of thiophen-2-yl and 2-substituted phenoxy groups have been synthesized and characterized. These complexes give green solutions and are easily soluble in most organic solvents. Four tetra-aryloxy substituted ZnAzaPc were synthesized as control substances. These compounds are less soluble in organic solvents and give blue-green solutions.
Octahedral geometry at the centre provide binding site for scavenging superoxide anion. Increase in antibacterial activity results from chelation effect provided by drug and neutral tridentate ligand.
Crystal structure of [Mn(tptz)(CH3COO)(OH2)2]NO3 has been obtained. Elemental analysis, electrochemistry, IR, EPR, UV–Vis and fluorescence emission spectra for the complex have also been determined. Reactions between oxone and the manganese complex led to oxygen-evolution.
Terpyridine copper(II) complexes [Cu(L)2](NO3)2 having pendant phenyl group in 1 and pyrenyl group in 2 are intercalative DNA binders. The pyrenyl-terpyridine complex 2 shows visible light-induced DNA cleavage via 1O2 pathway and exhibits photocytotoxicity in HeLa cancer cells giving IC50 value of 11.9 lM, while being essentially non-cytotoxic in dark.
O
R
R1 N
N
R
N
N N N N O
R = H or
N N N
N N
R
S R1
N Zn
N R1
O N
R
N R1
O
R1 = H OCH(CH3 )2 CH(CH 3) 2 C(CH3 )3
Contents
Swamy Maloth and Samudranil Pal Polyhedron 29 (2010) 3257 Copper(II) complexes with 2-[(2-pyridin-2-ylethylimino)-methyl]-phenol and its substituted derivatives: Syntheses, physical properties and structures
Amit Deshmukh, Anil Kinage, Rajiv Kumar and Reinout Meijboom Polyhedron 29 (2010) 3262 An efficient heterogeneous catalytic system for chemoselective hydrogenation of unsaturated ketones in aqueous medium
Syntheses, properties and structures of a series of copper(II) complexes having the formula [CuL(OAc)] (HL = n-R-2-[(2-pyridin-2-yl-ethylimino)-methyl]-phenol (R = H, Br, NO2 and OMe when n = 4 and R = OMe when n = 5)) are reported. The metal center in these complexes is in irregular N2O3 coordination sphere assembled by the N,N,O-donor L) and the bidentate acetate. One of the complexes (R = Br) forms dimeric units due to a pair of reciprocal Cu Br interactions.
A highly chemoselective (>99%) and green catalytic system for the chemoselective hydrogenation of unsaturated ketones to unsaturated alcohols, immobilized Ru(Phen)n complexes on MCM-41 materials, is demonstrated in aqueous medium. The catalyst was successfully recycled for the hydrogenation of unsaturated ketones.
The Publisher encourages the submission of articles in electronic form thus saving time and avoiding rekeying errors. For detailed instructions on the preparation of manuscripts and of electronic artwork, consult the Author Gateway for Elsevier at http://authors.elsevier.com
Full text of this journal is available, on-line from ScienceDirect. Visit www.sciencedirect.com for more information.
vii