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prelims, contents pages
Polyhedron 25, issue 12, 21 August 2006 www.elsevier.com/locate/poly
Contents Papers Zora Popovic´, Gordana Pavlovic´, Marijana Vinkovic´, Drazˇen Vikic´-Topic´, Masˇa Rajic´ Linaric´ Polyhedron 25 (2006) 2353 Coordination modes of 3-hydroxypicolinic acid (OH-picH): Synthesis and characterization of cadmium(II) complexes. Crystal and molecular structures of [CdX(OH-pic)(OH-picH)(H2O)]2 X = Cl), Br)
Fabiola Te´llez, Adrian Pen˜a-Hueso, Nora´h Barba-Behrens, Rosalinda Contreras, Angelina Flores-Parra Polyhedron 25 (2006) 2363 Coordination compounds in a pentacyclic aromatic system from 2-aminobenzothiazole derivatives and transition metal ions
Rupam Dinda, Saktiprosad Ghosh, Larry R. Falvello, Milagros Toma´s, Thomas C.W. Mak Polyhedron 25 (2006) 2375 Synthesis, structure, and reactivity of some new dipyridyl and diamine-bridged dinuclear oxomolybdenum(VI) complexes
Elsevier Ltd.
The cadmium(II) chloride and bromide react almost instantaneously with 3-hydroxypicolinic acid in water solution giving isostructural dinuclear complexes of general formula [CdX(OH-pic)(OH-picH)(H2O)]2; X = Cl), Br) which is established by the X-ray structural analysis and also supported by the thermal analysis. These compounds are not stable in solutions and NMR spectral analysis revealed the presence of cadmium(II) 3hydroxypicolinate as the only cadmium(II) compound in solution. Although, the synthesis conditions permit also a formation Cd(OHpic)2, apparently the packing forces in the solid state yield to the title complexes.
The syntheses and structural analyses of coordination compounds derived from 2(2-benzothiazolylamino)benzothiazole (1), 2-(2-aminobenzothiazolylamino)benzoxazole (2) and 2-(2-benzothiazolylamino)benzimidazole (3) with Co(II), Ni(II), and Zn(II) acetates and ligand 1 with Hg(II) acetate are reported. Three different geometries for the metal atoms were found: a distorted tetrahedron (for ML2 Co, Ni, Zn and Hg), a square pyramid [for Co and Ni in NiL2(MeOH)] and an octahedron for Ni(L)(OAc)(MeOH)2.
Some new diimine and diamine-bridged dinuclear Mo(VI) complexes of the general formula [(MoO2L)2(l-N–N)] along with their common mononuclear precursor [MoO2L(C2H5OH)] have been synthesized and structurally characterized by X-ray crystallography. The ONO donor ligand (LH2) is 2-hydroxy benzoylhydrazone of 2-hydroxybenzaldehyde and the bridging (l-N–N) ligands are 4, 40 -bipyridine(4,40 -bpy), trans-1,2-bis(4-pyridyl) ethene (bpe), trans-1,2-bis(4-pyridyl) ethane (bpa) and p-phenylenediamine (ppda).
OH
OH
O
O N H
N H
O
O
OH2
X'
H2O
Cd
Cd X
O
O
N
N
O
O HO
OH
H N
S N N
S
E
E N
E = S, O, NH M = Co, Ni, Zn, Hg
N
S N
N
N
MeHO
M N N E N S
N
S N
E N
Ni OHMe N N E N S
E N
Ni OHMe O
O CH3
iv
G. Kedarnath, Sandip Dey, Vimal K. Jain, Gautam K. Dey, Babu Varghese Polyhedron 25 (2006) 2383 2-(N,N-Dimethylamino)ethylselenolates of cadmium(II): Syntheses, structure of [Cd3(OAc)2(SeCH2CH2NMe2)4] and their use as single source precursors for the preparation of CdSe nanoparticles
Leonard Joachim Pereira, Weng Kee Leong Polyhedron 25 (2006) 2392 Substitution derivatives of the heteronuclear cluster RuOs3(l-H)2(CO)13: Disubstituted group 15 derivatives
Zoya A. Starikova, Vadim G. Kessler, Nataliya Ya. Turova, Ilya A. Dantsker, Alexandr P. Bobyljov, Alexander S. Mitiaev Polyhedron 25 (2006) 2401 Interaction of barium oxide and hydroxide with methanol: X-ray single crystal study of Ba(OH)2 methanol solvates
Cheng-Hsien Yang, Chun-Hung Chen, I-Wen Sun Polyhedron 25 (2006) 2407 Bathochromic effect of trifluoromethyl-substituted 2-naphthalen-1-yl-pyridine ligands in color tuning of iridium complexes
Contents
Cadmium selenolates, [Cd(SeCH2CH2NMe2)2] and [Cd3(OAc)2(SeCH2CH2NMe2)4], have been prepared and characterized. The structure of the latter has been established by X-ray crystallography. Thermolysis of [Cd(SeCH2CH2NMe2)2] in a mixture of solvents (HDA/TOPO) or in a furnace gave CdSe nanoparticles which were characterized by UV–Vis, photoluminescence, X-ray diffraction and electron microscopy.
The structures in the solid state and solution state of tertiary group 15 ligand disubstituted derivatives of the heteronuclear cluster RuOs3(l-H)2(CO)13 are examined. A number of isomeric structural types have been identified. In solution, most of these isomers are rapidly interconverting via hydride migrations. Substitution appears to be directed electronically to the ruthenium vertex, although steric hindrance appears to drive subsequent isomerisation via migration of the second group 15 ligand.
Dissolution of barium oxide or hydroxide in methanol or hydrolysis of barium methoxide results in the formation of crystalline products identified as methanol solvates of barium hydroxide, [Ba(OH)2(H2O)2](MeOH)2 (1) and [Ba(OH)2(MeOH)2](MeOH) (2).
The iridium complexes, (4-fnapy)2Ir(acac) and (5-fnapy)2Ir(acac), were prepared and their Xray crystal structures were determined. Compared to Ir(napy)2(acac), the introduction of trifluoromethyl-substituted ligands resulted in remarkable bathochromic effect. The trifluoromethyl group has a stronger influence on lowering the LUMO levels.
L
L Ru
H Os
H L
Os
L Ru
Os
H L
Os
Os
Isomer 2
Isomer 1 L
L Ru
H Os
H
Os Isomer 4
Os
L
Os H Isomer 5
Os
H L
Os H Isomer 3
Os
Ru
Ru
H L
Ru Os
H
Os
Os Os
Os L Os H
H L
Isomer 6
Contents
Thato N. Mtshali, Walter Purcell, Hendrik G. Visser, Stephen S. Basson Polyhedron 25 (2006) 2415 A crystallographic and kinetic study of the formation of the tricyanonitrido(pyridine-2carboxylato-jN,jO)rhenate(V) ion, [ReN(g2-pic)(CN)3]2)
Jian-Hao Zhou, Ru-Mei Cheng, You Song, Yi-Zhi Li, Zhi Yu, Xue-Tai Chen, Xiao-Zeng You Polyhedron 25 (2006) 2426 Syntheses, structures and magnetic properties of two new water bridged dinuclear nickel(II) complexes containing derivatives of 1,2,4triazole and pivalate ligands
M. John Plater, Steven Kemp, Eugenio Coronado, Carlos J. Go´mez-Garcı´a, Ross W. Harrington, W. Clegg Polyhedron 25 (2006) 2433 A stable oxoverdazyl free radical: Structural and magnetic characterization
Lionel Salmon, Pierre Thue´ry, Shinpei Miyamoto, Takehiko Yamato, Michel Ephritikhine Polyhedron 25 (2006) 2439 Uranium(V) and uranium(IV/V) mixed valence complexes with p-tert-butylhomocalix[n]arenes (n = 4, 6)
The substitution reaction between [ReN(H2O)(CN)4]2) and pic) (pyridine-2-carboxylato anion) resulted in the substitution of the aqua and cyano ligands to form the [ReN(g2-pic)(CN)3]2) complex. The two consecutive reactions were kinetically investigated with the fast aqua substitution resulting in a rate constant of 1.92(5) · 10)1 M)1 s)1 at 40.3 C. A rate constant of 1.84(2) · 10)2 s)1 at 80 C was obtained for the second, slower cyano substitution. The negative entropy of activation of )133.4(3) J K)1 mol)1 for the slow reaction points to associative activation.
Two new water bridged dinuclear nickel(II) complexes 1 Æ 13H2O and 2 Æ 3H2O containing derivatives of 1,2,4-trizaole and pivalate ligands have been synthesized and structurally characterized. Magnetic susceptibility measurements on the powder samples of 1 and 2 at 1.8–300 K revealed that the overall weak antiferromagnetic coupling occur among nickel(II) ions.
Stable red crystals of 1 were too small for standard X-ray single-crystal structure determination so synchrotron radiation was used to solve the structure. Data were collected on a sample of the radical that had been accidentally set aside in a sample vial for five years. Susceptibility measurements showed that weak anti-ferromagnetism exists between the radicals. ESR spectroscopy shows the spin distribution in this stable radical.
UCl4 reacts with homocalixarenes comprising four or six phenolic units to give either a mononuclear UV complex with the smaller macrocycle or, with the larger one, a tetranuclear UIV/UV mixed valence species built from two macrocycles, two l3-oxo and two bridging chlorine atoms. In both cases, all the phenoxide groups are metal-bound. The mononuclear species assembles to form a dimeric capsule through weak interactions with the counter-ions.
v
vi
K. Umeda, J. Zukerman-Schpector, P.C. Isolani Polyhedron 25 (2006) 2447 Uranyl (1,3-diphenylpropane-1,3-dionato) complexes with N-adamantylacetamide and azacyclononanone: Synthesis, spectroscopy, luminescence and crystal structures
N. Kumaraguru, K. Santhakumar Polyhedron 25 (2006) 2452 Studies on solvophobic interactions and micelle formation of some surface active Cr(III) complexes in non-aqueous solvents
Emira Kahrovic´, Kresˇimir Molcˇanov, Ljerka Tusˇek-Bozˇic´, Biserka Kojic´-Prodic´ Polyhedron 25 (2006) 2459 New complexes of Mo(V) with Schiff bases: Crystal structure of butylammonium di-l-oxol-acetato-bis[(N-butylsalicylideniminato-N,O)oxomolybdenum(V)] benzene, acetic acid solvate
Anna S. Litvinenko, Alexey Y. Timoshkin, Henry F. Schaefer III Polyhedron 25 (2006) 2465 Thermodynamics of thermal decomposition of group 13 metal trihalide adducts with piperidine: A combined theoretical and experimental study
Contents
The synthesis and characterization of uranyl 1,3-diphenylpropane-1,3-dionato (benzoylacetonate, ba) complexes with N-adamantylacetamide, 2-azacyclononanone and triphenylphosphine oxide, with general formula UO2(ba)2L are described. They were characterized by infrared, Raman and emission spectroscopies. All complexes are luminescent, presenting the characteristic uranyl vibronic spectrum. The crystal structures of the N-adamantylacetamide and 2-azacyclononanone were determined. All complexes are heptacoordinated and all neutral ligands bond through an oxygen atom. In the case of the Nadamantylacetamide complex there are two independent molecules in the asymmetric unit cell. Both structures are reported.
The critical micelle concentration (cmc) of three kinds of metallosurfactants of the type cis-halogeno(dedocylamine)bis(ethylenediamine)chromium(III) have been studied in n-alcohol and formamide mixtures at different temperatures by the electrical conductivity method. Specific conductivity data (at 293–313 K) served for the evaluation of temperature dependent cmc values and thermodynamic parameters such as DG0m ; DH 0m and DS 0m .
C213 C310 C33 C37
C215
C34
C32 C31
C36 C35 C39
C210
C211
C23
O22
N
C22 C21
C41 C42 O21
C27
C25
O1
C111 C110
C28
C24
U
O12 C112
C29
O2
O41
O11
C113
C13
C26
C14
C11
C12
C115
C19 C18
C15
C114
C17
C16
hydrophilic head group
O-
M
III
Na+
O S O O
MIII : Cr(III)
hydrophobic tail group
hydrophobic tail group Metallosurfactant
Mo(V) Schiff base complexes derived from alkylamines and salycilaldehide were prepared and characterised by chemical analysis, IR and UV/Vis spectroscopy. The title complex C4H9NH3[Mo2O4(N-C4H9-salim)2OCOCH3] Æ C6H6 Æ CH3COOH is characterised by X-ray structure analysis. The structure is composed of a dinuclear di-l-oxo-l-acetato-bis[(N-butylsalicylideniminato-N,O)oxomolybdenum(V)] anion, butylammonium cation and two solvent molecules: benzene and acetic acid.
Three major decomposition pathways of complexes formed by MX3 (M = Al, Ga; X = Cl, I) and piperidine (pip) have been theoretically considered at the B3LYP/LANL2DZ(d,p) level of theory. Hydrogen gas elimination with formation of gaseous MX3 Æ pyridine complexes becomes thermodynamically favorable above 500 K and is expected as a primary thermolysis product of MX3 Æ pip. Alternative routes, which include dissociation into components or hydrogen halide elimination, require much higher temperatures. This theoretical conclusion is in qualitative agreement with present experimental thermolysis study of the GaCl3 Æ pip complex.
C214
C212
Sodium dodecylsulphate
O3
O1
N1
O2
N2 Mo2
Mo1 O4
O7
O8 O6
O5
NH
X +
M X
X
(A) H N
X M
X X
(C)
(B) -HX
-3H2
X
1
/2
X
X
M
N
N
M X
N X
M
X X
Contents
Paula C.R. Soares-Santos, Filipe A. Almeida Paz, Rute A. Sa´ Ferreira, Jacek Klinowski, Luı´s D. Carlos, Tito Trindade, Helena I.S. Nogueira Polyhedron 25 (2006) 2471
Coordination modes of picolinic, 3-hydroxypicolinic and 2-hydroxynicotinic acids in samarium (III) complexes were investigated, showing N,O- or O,O-chelation in onedimensional chains. These complexes show room-temperature photoluminescence.
Coordination modes of pyridine-carboxylic acid derivatives in samarium (III) complexes
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
vii
Contents Papers Zora Popovic´, Gordana Pavlovic´, Marijana Vinkovic´, Drazˇen Vikic´-Topic´, Masˇa Rajic´ Linaric´ Polyhedron 25 (2006) 2353 Coordination modes of 3-hydroxypicolinic acid (OH-picH): Synthesis and characterization of cadmium(II) complexes. Crystal and molecular structures of [CdX(OH-pic)(OH-picH)(H2O)]2 X = Cl), Br)
Fabiola Te´llez, Adrian Pen˜a-Hueso, Nora´h Barba-Behrens, Rosalinda Contreras, Angelina Flores-Parra Polyhedron 25 (2006) 2363 Coordination compounds in a pentacyclic aromatic system from 2-aminobenzothiazole derivatives and transition metal ions
Rupam Dinda, Saktiprosad Ghosh, Larry R. Falvello, Milagros Toma´s, Thomas C.W. Mak Polyhedron 25 (2006) 2375 Synthesis, structure, and reactivity of some new dipyridyl and diamine-bridged dinuclear oxomolybdenum(VI) complexes
Elsevier Ltd.
The cadmium(II) chloride and bromide react almost instantaneously with 3-hydroxypicolinic acid in water solution giving isostructural dinuclear complexes of general formula [CdX(OH-pic)(OH-picH)(H2O)]2; X = Cl), Br) which is established by the X-ray structural analysis and also supported by the thermal analysis. These compounds are not stable in solutions and NMR spectral analysis revealed the presence of cadmium(II) 3hydroxypicolinate as the only cadmium(II) compound in solution. Although, the synthesis conditions permit also a formation Cd(OHpic)2, apparently the packing forces in the solid state yield to the title complexes.
The syntheses and structural analyses of coordination compounds derived from 2(2-benzothiazolylamino)benzothiazole (1), 2-(2-aminobenzothiazolylamino)benzoxazole (2) and 2-(2-benzothiazolylamino)benzimidazole (3) with Co(II), Ni(II), and Zn(II) acetates and ligand 1 with Hg(II) acetate are reported. Three different geometries for the metal atoms were found: a distorted tetrahedron (for ML2 Co, Ni, Zn and Hg), a square pyramid [for Co and Ni in NiL2(MeOH)] and an octahedron for Ni(L)(OAc)(MeOH)2.
Some new diimine and diamine-bridged dinuclear Mo(VI) complexes of the general formula [(MoO2L)2(l-N–N)] along with their common mononuclear precursor [MoO2L(C2H5OH)] have been synthesized and structurally characterized by X-ray crystallography. The ONO donor ligand (LH2) is 2-hydroxy benzoylhydrazone of 2-hydroxybenzaldehyde and the bridging (l-N–N) ligands are 4, 40 -bipyridine(4,40 -bpy), trans-1,2-bis(4-pyridyl) ethene (bpe), trans-1,2-bis(4-pyridyl) ethane (bpa) and p-phenylenediamine (ppda).
OH
OH
O
O N H
N H
O
O
OH2
X'
H2O
Cd
Cd X
O
O
N
N
O
O HO
OH
H N
S N N
S
E
E N
E = S, O, NH M = Co, Ni, Zn, Hg
N
S N
N
N
MeHO
M N N E N S
N
S N
E N
Ni OHMe N N E N S
E N
Ni OHMe O
O CH3
iv
G. Kedarnath, Sandip Dey, Vimal K. Jain, Gautam K. Dey, Babu Varghese Polyhedron 25 (2006) 2383 2-(N,N-Dimethylamino)ethylselenolates of cadmium(II): Syntheses, structure of [Cd3(OAc)2(SeCH2CH2NMe2)4] and their use as single source precursors for the preparation of CdSe nanoparticles
Leonard Joachim Pereira, Weng Kee Leong Polyhedron 25 (2006) 2392 Substitution derivatives of the heteronuclear cluster RuOs3(l-H)2(CO)13: Disubstituted group 15 derivatives
Zoya A. Starikova, Vadim G. Kessler, Nataliya Ya. Turova, Ilya A. Dantsker, Alexandr P. Bobyljov, Alexander S. Mitiaev Polyhedron 25 (2006) 2401 Interaction of barium oxide and hydroxide with methanol: X-ray single crystal study of Ba(OH)2 methanol solvates
Cheng-Hsien Yang, Chun-Hung Chen, I-Wen Sun Polyhedron 25 (2006) 2407 Bathochromic effect of trifluoromethyl-substituted 2-naphthalen-1-yl-pyridine ligands in color tuning of iridium complexes
Contents
Cadmium selenolates, [Cd(SeCH2CH2NMe2)2] and [Cd3(OAc)2(SeCH2CH2NMe2)4], have been prepared and characterized. The structure of the latter has been established by X-ray crystallography. Thermolysis of [Cd(SeCH2CH2NMe2)2] in a mixture of solvents (HDA/TOPO) or in a furnace gave CdSe nanoparticles which were characterized by UV–Vis, photoluminescence, X-ray diffraction and electron microscopy.
The structures in the solid state and solution state of tertiary group 15 ligand disubstituted derivatives of the heteronuclear cluster RuOs3(l-H)2(CO)13 are examined. A number of isomeric structural types have been identified. In solution, most of these isomers are rapidly interconverting via hydride migrations. Substitution appears to be directed electronically to the ruthenium vertex, although steric hindrance appears to drive subsequent isomerisation via migration of the second group 15 ligand.
Dissolution of barium oxide or hydroxide in methanol or hydrolysis of barium methoxide results in the formation of crystalline products identified as methanol solvates of barium hydroxide, [Ba(OH)2(H2O)2](MeOH)2 (1) and [Ba(OH)2(MeOH)2](MeOH) (2).
The iridium complexes, (4-fnapy)2Ir(acac) and (5-fnapy)2Ir(acac), were prepared and their Xray crystal structures were determined. Compared to Ir(napy)2(acac), the introduction of trifluoromethyl-substituted ligands resulted in remarkable bathochromic effect. The trifluoromethyl group has a stronger influence on lowering the LUMO levels.
L
L Ru
H Os
H L
Os
L Ru
Os
H L
Os
Os
Isomer 2
Isomer 1 L
L Ru
H Os
H
Os Isomer 4
Os
L
Os H Isomer 5
Os
H L
Os H Isomer 3
Os
Ru
Ru
H L
Ru Os
H
Os
Os Os
Os L Os H
H L
Isomer 6
Contents
Thato N. Mtshali, Walter Purcell, Hendrik G. Visser, Stephen S. Basson Polyhedron 25 (2006) 2415 A crystallographic and kinetic study of the formation of the tricyanonitrido(pyridine-2carboxylato-jN,jO)rhenate(V) ion, [ReN(g2-pic)(CN)3]2)
Jian-Hao Zhou, Ru-Mei Cheng, You Song, Yi-Zhi Li, Zhi Yu, Xue-Tai Chen, Xiao-Zeng You Polyhedron 25 (2006) 2426 Syntheses, structures and magnetic properties of two new water bridged dinuclear nickel(II) complexes containing derivatives of 1,2,4triazole and pivalate ligands
M. John Plater, Steven Kemp, Eugenio Coronado, Carlos J. Go´mez-Garcı´a, Ross W. Harrington, W. Clegg Polyhedron 25 (2006) 2433 A stable oxoverdazyl free radical: Structural and magnetic characterization
Lionel Salmon, Pierre Thue´ry, Shinpei Miyamoto, Takehiko Yamato, Michel Ephritikhine Polyhedron 25 (2006) 2439 Uranium(V) and uranium(IV/V) mixed valence complexes with p-tert-butylhomocalix[n]arenes (n = 4, 6)
The substitution reaction between [ReN(H2O)(CN)4]2) and pic) (pyridine-2-carboxylato anion) resulted in the substitution of the aqua and cyano ligands to form the [ReN(g2-pic)(CN)3]2) complex. The two consecutive reactions were kinetically investigated with the fast aqua substitution resulting in a rate constant of 1.92(5) · 10)1 M)1 s)1 at 40.3 C. A rate constant of 1.84(2) · 10)2 s)1 at 80 C was obtained for the second, slower cyano substitution. The negative entropy of activation of )133.4(3) J K)1 mol)1 for the slow reaction points to associative activation.
Two new water bridged dinuclear nickel(II) complexes 1 Æ 13H2O and 2 Æ 3H2O containing derivatives of 1,2,4-trizaole and pivalate ligands have been synthesized and structurally characterized. Magnetic susceptibility measurements on the powder samples of 1 and 2 at 1.8–300 K revealed that the overall weak antiferromagnetic coupling occur among nickel(II) ions.
Stable red crystals of 1 were too small for standard X-ray single-crystal structure determination so synchrotron radiation was used to solve the structure. Data were collected on a sample of the radical that had been accidentally set aside in a sample vial for five years. Susceptibility measurements showed that weak anti-ferromagnetism exists between the radicals. ESR spectroscopy shows the spin distribution in this stable radical.
UCl4 reacts with homocalixarenes comprising four or six phenolic units to give either a mononuclear UV complex with the smaller macrocycle or, with the larger one, a tetranuclear UIV/UV mixed valence species built from two macrocycles, two l3-oxo and two bridging chlorine atoms. In both cases, all the phenoxide groups are metal-bound. The mononuclear species assembles to form a dimeric capsule through weak interactions with the counter-ions.
v
vi
K. Umeda, J. Zukerman-Schpector, P.C. Isolani Polyhedron 25 (2006) 2447 Uranyl (1,3-diphenylpropane-1,3-dionato) complexes with N-adamantylacetamide and azacyclononanone: Synthesis, spectroscopy, luminescence and crystal structures
N. Kumaraguru, K. Santhakumar Polyhedron 25 (2006) 2452 Studies on solvophobic interactions and micelle formation of some surface active Cr(III) complexes in non-aqueous solvents
Emira Kahrovic´, Kresˇimir Molcˇanov, Ljerka Tusˇek-Bozˇic´, Biserka Kojic´-Prodic´ Polyhedron 25 (2006) 2459 New complexes of Mo(V) with Schiff bases: Crystal structure of butylammonium di-l-oxol-acetato-bis[(N-butylsalicylideniminato-N,O)oxomolybdenum(V)] benzene, acetic acid solvate
Anna S. Litvinenko, Alexey Y. Timoshkin, Henry F. Schaefer III Polyhedron 25 (2006) 2465 Thermodynamics of thermal decomposition of group 13 metal trihalide adducts with piperidine: A combined theoretical and experimental study
Contents
The synthesis and characterization of uranyl 1,3-diphenylpropane-1,3-dionato (benzoylacetonate, ba) complexes with N-adamantylacetamide, 2-azacyclononanone and triphenylphosphine oxide, with general formula UO2(ba)2L are described. They were characterized by infrared, Raman and emission spectroscopies. All complexes are luminescent, presenting the characteristic uranyl vibronic spectrum. The crystal structures of the N-adamantylacetamide and 2-azacyclononanone were determined. All complexes are heptacoordinated and all neutral ligands bond through an oxygen atom. In the case of the Nadamantylacetamide complex there are two independent molecules in the asymmetric unit cell. Both structures are reported.
The critical micelle concentration (cmc) of three kinds of metallosurfactants of the type cis-halogeno(dedocylamine)bis(ethylenediamine)chromium(III) have been studied in n-alcohol and formamide mixtures at different temperatures by the electrical conductivity method. Specific conductivity data (at 293–313 K) served for the evaluation of temperature dependent cmc values and thermodynamic parameters such as DG0m ; DH 0m and DS 0m .
C213 C310 C33 C37
C215
C34
C32 C31
C36 C35 C39
C210
C211
C23
O22
N
C22 C21
C41 C42 O21
C27
C25
O1
C111 C110
C28
C24
U
O12 C112
C29
O2
O41
O11
C113
C13
C26
C14
C11
C12
C115
C19 C18
C15
C114
C17
C16
hydrophilic head group
O-
M
III
Na+
O S O O
MIII : Cr(III)
hydrophobic tail group
hydrophobic tail group Metallosurfactant
Mo(V) Schiff base complexes derived from alkylamines and salycilaldehide were prepared and characterised by chemical analysis, IR and UV/Vis spectroscopy. The title complex C4H9NH3[Mo2O4(N-C4H9-salim)2OCOCH3] Æ C6H6 Æ CH3COOH is characterised by X-ray structure analysis. The structure is composed of a dinuclear di-l-oxo-l-acetato-bis[(N-butylsalicylideniminato-N,O)oxomolybdenum(V)] anion, butylammonium cation and two solvent molecules: benzene and acetic acid.
Three major decomposition pathways of complexes formed by MX3 (M = Al, Ga; X = Cl, I) and piperidine (pip) have been theoretically considered at the B3LYP/LANL2DZ(d,p) level of theory. Hydrogen gas elimination with formation of gaseous MX3 Æ pyridine complexes becomes thermodynamically favorable above 500 K and is expected as a primary thermolysis product of MX3 Æ pip. Alternative routes, which include dissociation into components or hydrogen halide elimination, require much higher temperatures. This theoretical conclusion is in qualitative agreement with present experimental thermolysis study of the GaCl3 Æ pip complex.
C214
C212
Sodium dodecylsulphate
O3
O1
N1
O2
N2 Mo2
Mo1 O4
O7
O8 O6
O5
NH
X +
M X
X
(A) H N
X M
X X
(C)
(B) -HX
-3H2
X
1
/2
X
X
M
N
N
M X
N X
M
X X
Contents
Paula C.R. Soares-Santos, Filipe A. Almeida Paz, Rute A. Sa´ Ferreira, Jacek Klinowski, Luı´s D. Carlos, Tito Trindade, Helena I.S. Nogueira Polyhedron 25 (2006) 2471
Coordination modes of picolinic, 3-hydroxypicolinic and 2-hydroxynicotinic acids in samarium (III) complexes were investigated, showing N,O- or O,O-chelation in onedimensional chains. These complexes show room-temperature photoluminescence.
Coordination modes of pyridine-carboxylic acid derivatives in samarium (III) complexes
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
vii