SYNTHESIS AND PHYSICOCHEMICAL STUDIES ON RHENIUM(V) COMPLEXES WITH 2-BENZIMIDAZOLETHIONE

A new series of rhenium(V) complexes were prepared by the reaction of 2-benzimidazolethione with H-2[ReOCl5]. Mononuclear complexes of diffe rent types, such as [ReOLCl(3)(OH2)], [ReOL(2)(OH2)(3)]Cl-3 and [ReOLC l(OH2)(3)]Cl-2, and dinuclear complexes, such as [Re(2)O(3)L(2)Cl(4)]. 2H(2)O and [Re(2)O(2)L(3)Cl(6)].2H(2)O, where L = 2-benzimidazolethion e were obtained depending on the metal : ligand molar ratio and the co ncentration of hydrochloric acid containing the starting rhenium compl ex. The electronic absorption spectra and magnetic moments of the comp lexes show that they have octahedral configurations. LR and conductivi ty measurements combined with thermal analyses show that the ligand be haves as a neutral, mono- or bidentate ligand towards the metal atoms.