Showing papers by "Jean-Marc Latour published in 1991"

Synthesis and characterization of dinuclear copper(II) complexes of the dinucleating ligand 2,6-bis[(bis((1-methylimidazol-2-yl)methyl)amino)methyl]-4-methylphenol

Abstract: The synthesis, crystal structures, and magnetic and spectroscopic properties are reported for a series of dinuclear copper (II) complexes of the novel dinucleating polyimidazole ligand 2,6-bis [(bis((1-methylimidazol-2-yl)methyl)amino)methyl]-4-methylphenol (Hbimp). The copper complexes have both «open» ([Cu 2 (bimp)(H 2 O) 2 ](ClO 4 ) 3 and [Cu 2 (bimp)(CH 3 OH) 2 ](ClO 4 ) 3 ) and «closed» ([Cu 2 (bimp)(OCH 3 )](ClO 4 ) 2 and [Cu 2 (bimp)(N 3 )](ClO 4 ) 2 ) type structures. X-ray crystal structures of complexes

Binuclear copper(II) complexes of a new sulphur-containing binucleating ligand: structural and physicochemical properties

Abstract: The new ligand HL [2,6-bis{4-(benzimidazol-2-yl)-2-thiabutyl}-4-methylphenol] has been prepared. Its reaction with various copper(II) salts afforded a series of complexes 1–6 of general formula Cu2L(X)Y2(X = Y = Cl, 1; X = Y = Br, 2; X = OH, Y = CIO4, 3; X = Y = NO3, 4; X = N3, Y = NO3, 5; X = N3, Y = CIO4, 6). The molecular structure of 6 was determined by X-ray diffraction analysis. It exists as a discrete, dinuclear species in the solid state. The two copper sites are related by a symmetry axis and bridged by the phenoxo oxygen and a nitrogen from the µ-1,1-azide. Each copper is in a square-pyramidal environment, the base of which is constituted by an oxygen, a sulphur and a nitrogen from the organic ligand and the bridging azide nitrogen, while a perchlorato oxygen occupies the apical site. All compounds exhibit a high antiferromagnetic coupling which probably results from sulphur ligation. They exchange electrons at moderately positive potentials which reflects the balance between the hard phenoxo oxygen and the soft nitrogen and sulphur donors provided by the ligand.

Unsymmetric dicopper(II) complexes of dinucleating ligands bearing chemically distinct co-ordination environments

Abstract: Dicopper(II) complexes of unsymmetrical dinucleating Schiff-base ligands bearing chemically distinct co-ordination sites have been prepared and their properties studied. The ligands were derived from the condensation of 4-bromo-2-formyl-6-(4-methylpiperazin-1-ylmethyl)phenol and 4-bromo-2-[(2-diethylaminoethyl)ethylaminomethyl]-6-formylphenol with 2-(aminomethyl)pyridine, 2-(2-aminoethyl)pyridine, and 2-(aminomethyl)-4-nitrophenol.