SYNTHESIS AND SPECTRAL STUDIES OF NOVEL COPPER(II) CHELATES OF SULFUR-CONTAINING OXIMES

Copper complexes of benzil-alpha-monoxime-2-iminoethanethiol (BMETH(2) ), benzil-alpha-monoxime-2-iminobenzenethiol (BMBTH(2)), benzil-alpha- monoximethiosemicarbazone (BMTH(2)) and benzil-alpha-monoximesemicarba zone (BMSH(2)) were synthesized and characterized by physicochemical a nd spectroscopic measurements. The molar conductivities show that all of the complexes are nonelectrolytes. The i.r. spectra suggest that th e ligands are tetradentate in all cases, whilst the electronic spectra suggest planar geometries for all the complexes. The calculated e.s.r . parameters show an axial dx(2) - y(2) ground state and suggest coord ination through sulphur, in agreement with the i.r. results. In all of these complexes, the =N-O group acts as a bridging function to give d imeric structures.