Polymeric copper(II) and nickel(II) complexes of a tetraoxime containing abinucleating macrocycle ligand

Polymeric copper(II) and nickel(II) complexes of a binucleating tetraoxime macrocycle, 6,6'-methylenebis[1,12-di(hydroximino)-2,3;9,10-dibenzo-1,11-di aza-4,8-dithiacyclotridecane] (H4L), have been prepared and characterised b y elemental analysis, magnetic moments, i.r., uv/vis., and e.p.r. spectral studies. I.r. spectra show that the ligand acts in a tetradentate manner an d coordinates via N, S and O donor atoms. The geometry of the resulting met al chelates is discussed with the help of magnetic and spectroscopic measur ements. The elemental analyses, stoichiometry and the spectroscopic data of the complexes indicate that the copper(II) and nickel(II) ions are coordin ated by the coordination environment of the ligand. The spectral data sugge st a distorted tetragonal geometry for polymeric copper(II), and nickel(II) ions in the complexes. The stoichiometry of the metal-to-H4L ratio of comp lexes (2) and (3), prepared from CuCl2 and NiCl2 respectively, was 3:1, sug gesting the formation of polymeric species.