SYNTHESIS AND CRYSTAL-STRUCTURE OF A COPPER(II) COMPLEX WITH A TETRADENTATE DITHIADIOXIME LIGAND

A neutral five-coordinate dithiadioxime complex of copper (II), chloro [3,3'-(1,3-propanedithia)bis(3-methyl-2-butanone oximato)(1 -)-S,S',N ,N'] copper (II) (Cu(LH)CI), was prepared by reaction of CuCl2, with t he [3,3'-(1, 3-propanedithia)bis (3-methyl-2-butanone oxime)] ligand ( LH(2)) in methanol-acetone. The crystal structure of the Cu(LH)Cl mono hydrate, [CuCl(C13H25N2S2O2)]. H2O, reveals a square pyramidal geometr y about the metal centre. The copper (II) ion is coordinated in an app roximate square plane by the two oxime nitrogen atoms and two thioethe r sulphur atoms of the tetradentate dithiadioxime ligand, with the chl orine occupying an axial coordination site at a Cu-Cl distance of 2.39 31(8) Angstrom. The copper-to-nitrogen distances average 1.997 Angstro m, while the copper-to-sulphur distances average 2.3279 Angstrom. The least-squares S2N2 plane is situated 0.467(1) Angstrom below the coppe r centre. A proton bridges the two oxime oxygen atoms of the complex i n the fashion typical of metal complexes containing cis-oxime function s.