COPPER-COMPLEXES DERIVED FROM 1-(2-CARBOXYBENZOYL)THIOSEMICARBAZIDE (H(3)L) - SYNTHESES, CHARACTERIZATION AND CRYSTAL-STRUCTURE OF [CU(3)L(2)(PY)(6)](HIM)(H2O)(2)

The reaction of CuCl2 . 2H(2)O with 1-(2-carboxybenzoyl)thiosemicarbaz ide (H(3)L) and imidazole (HIm) in NaOH gave a Cu-II complex, which wa s crystallized from pyridine (Py) to give complex 1, [Cu-3 L(2)(Py)(6) (HIm)](H2O)(2). The complex molecule contains a linear Cu-3 array in w hich the central copper atom at the crystallographic inversion centre has an octahedral environment and the other two Cu atoms are square py ramidal, each bridged to the central Cu atom via the L group, with the atoms O(1) and N(2) chelating to Cu(1), and the atoms N(1), S and O(2 ) to Cu(2). The carboxylate groups coordinate to the metal atoms in a unidentate fashion. Complex 2, [Cu-2(H(3)L)(2)Cl-2](H2O)(3), obtained by the reaction of CuCl2 . 2H(2)O with H(3)L has been characterized by IR, UV, NMR (H-1 and C-13) spectra, and TGA and molar conductance mea surements. The ESR and magnetic moment measurements show that the Cu a toms in complex 2 are in the Cu-I oxidation state. (C) 1997 Elsevier S cience Ltd.