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A carboxylate-bridged Cu(II)-Gd(III) complex, [GdCu(CH2CH(CH3COO)4(H2O)4]n(NO3)n, was prepared and characterized. Single crystal X-ray analysis reveals the complex as a carboxylate-bridged 1-D Cu(II)-Gd(III) coordination polymer. The magnetic measurement showed this complex exhibiting weak ferromagnetic behavior. [ABSTRACT FROM AUTHOR]

A carboxylate-bridged Co(II)-Gd(III) complex, [(bipy)CoL3Gd(NO3)L3Co(bipy)] (HL = α-methylacrylic acid, bipy = 2,2'-bipyridine), was prepared and characterized. Single crystal X-ray analysis reveals that the complex assumes a carboxylate-bridged CoGdCo unit. Magnetic measurements showed χmT decreases when the temperature is lowered. [ABSTRACT FROM AUTHOR]

Heteronuclear complexes containing oxorhenium(V), with Fe(III), Co(II), Ni(II), Cu(II), Cd(II) and UO 2 (VI) ions were prepared by the reaction of the complex ligands [ReO(HL 1 )(PPh 3 )(OH 2 )Cl]Cl ( a ) and/or [ReO(H 2 L 2 )(PPh 3 )(OH 2 )Cl]Cl ( b ), where H 2 L 1 = 1-(2-hydroxyphenyl)butane-1,3-dione-3-(5,6-diphenyl-1,2,4-triazine-3-ylhydrazone) and H 3 L 2 = 1-(2-hydroxyphenyl)butane-1,3-dione-3-(1 H -benzimidazol-2-ylhydrazone), with transition and actinide salts. Heterodinuclear complexes of ReO(V) with Fe(III), Co(II), Ni(II), Cu(II) and Cd(II) were obtained using a 1 : 1 mole ratio of the complex ligand and the metal salt. Heterotrinuclear complexes were obtained containing ReO(V) with UO 2 (VI) and Cu(II) using 2 : 1 mole ratios of the complex ligand and the metal salts. The complex ligands a and b coordinate with the heterometal ion via a nitrogen of the heterocyclic ring and the nitrogen atom of the C=N 7 group. All transition metal cations in the heteronuclear complexes have octahedral configurations, while UO 2 (VI) complexes have distorted dodecahedral geometry. The structures of the complexes were elucidated by IR, ESR, electronic and 1 H NMR spectra, magnetic moments, conductance and TG-DSC measurements. The antifungal activities of the complex ligands and their heteronuclear complexes towards Alternaria alternata and Aspergillus niger showed comparable behavior with some well-known antibiotics. [ABSTRACT FROM AUTHOR]

A novel heteronuclear complex, [Gd 2 Zn 2 L 10 (bipy)(H 2 O) 2 ] 2 (HL = α-methylacrylic acid, bipy = 4,4′-bipyridine), was synthesized and characterized. Its structure, determined by X-ray diffraction, reveals a discrete octanuclear molecule, in which two Zn II ions are linked by a bipy molecule and Gd III ions, and Gd III and Zn II ions are bridged by bidentate α-methylacrylato groups. The complex crystallizes in space group P with Z = 1, a = 13.4504(6), b = 14.9697(5), c = 16.4374(5) Å, α = 64.212(3), β = 89.727(2), γ = 86.241(1)°. The structure was refined to R = 0.0303 for 8925 observed reflections. The temperature dependence of the magnetic susceptibility of the complex shows that a weak intramolecular ferromagnetic interaction exists as well as an intermolecular antiferromagnetic interaction. [ABSTRACT FROM AUTHOR]

New heteronuclear complexes containing oxorhenium(V), Cu(II), Ni(II), Fe(III), UO 2 (VI) and Th(IV) ions were prepared by the reaction of the complex ligand, [ReO(H 4 L)Cl]Cl 2 , where H 4 L = 8,17-dimethyl-6,15-dioxo-5,7,14,16-tetrahydrodibenzo[ a , h ][14]annulene-2,11-dicarboxylic acid, with the previous transition and actinide salts. Three heteronuclear Cu(II) complexes were isolated depending on the ratio of [ReO(H 4 L)Cl]Cl 2 : Cu(II) ion. When the ratios were 1 : 0.5, 1 : 1 and 1 : 2, the heteronuclear complexes {[ReO(H 3 L)Cl] 2 CuCl 2 (OH 2 ) 2 }SO 4 · H 2 O ( I ), [ReO(H 3 L)Cl 2 Cu(OH 2 ) 2 (SO 4 )] ( II ) and {ReO(H 2 L)Cl[Cu(OH 2 ) 3 SO 4 ] 2 } ( III ) were obtained, respectively. Heteronuclear complexes of the other metal cations were obtained by mixing [ReO(H 4 L)Cl]Cl 2 with the metal salt in the ratio 1 : 1 to obtain the heteronuclear complexes [ReO(H 3 L)Cl 2 Ni(OH 2 ) 2 ](NO 3 ) 2 ( IV ), [ReO(H 3 L)Cl 3 Fe(OH 2 ) 3 ](NO 3 ) 2 ( V ), [ReO(H 3 L)ClUO 2 (NO 3 ) 2 (OH 2 )]Cl ( VI ) and [ReO(H 3 L)Cl 3 Th(NO 3 ) 2 (OH 2 )]NO 3 · 2H 2 O ( VII ). The complex ligand coordinates with the heterometal ion via the carboxylate group, and the infrared bands ν as COO and ν s COO indicate that the carboxylate acts as a unidentate ligand to the heterometal cations. Cu(II) and Fe(III) cations in the heteronuclear complexes have octahedral geometry, while Ni(II) is square planar. Thermal studies explored the possibility of obtaining new heteronuclear complexes pyrolytically in the solid state from the corresponding mother complexes. The structures of the complexes were elucidated by conductance, IR and electronic spectra, magnetic moments, 1 H NMR and TG-DSC measurements as well as by mass spectroscopy. [ABSTRACT FROM AUTHOR]

The title complex has prepared by the reaction of TbL 3 , Cu(NO 3 ) 2 and phen in H 2 O/EtOH (where L = α-methylacrylato; phen = 1,10-phenanthroline) and its structure determined by X-ray diffraction methods. The complex crystallizes in the triclinic space group P ī with Z = 1, a = 11.569(2), b = 14.584(3), c = 11.479(2) Å, α = 101.03(2), β = 104.37(2), γ = 74.01(1)°, and the structure was refined to R = 0.041 for 6463 observed reflections. The structure contains a discrete tetranuclear CuTbTbCu molecule. Copper(II) and terbium(III) are bridged by three bidentate carboxyl groups with a Tb ··· Cu separation of 3.9059(9) Å. The Tb ion is eight coordinate and exhibits a distorted square antiprism. The Cu ion is five coordinate and has distorted pyramidal geometry. [ABSTRACT FROM AUTHOR]