Polymetallic complexes: Part XX – Complexes of cobalt(II), nickel(II), copper(II), Zinc(II), cadmium(II) and mercury(II) with 1,2,5,6-tetraphenyl-3,4-diazahexa-2,4~diene-1,6-diol

Abstract

Five dimeric complexes of cobalt(II), nickel(II), zinc(II), cadmium(II) and mercury(II) and one tetrameric copper(II) complex with the schiff base 1,2,5,6-tetraphenyl- 3,4-diazahexa- 2,4-diene-l ,6-diol have been synthesized: The schiff base behaves as a bis-bidentate ligand having ON - NO donor atoms. The complexes have been characterised on the basis of analytical, conductance, magnetic susceptibility, IR and electronic spectral data apart from <em>p</em>Ka measurements. The data are consistent with distorted octahedral stereochemistry for Co(II), Ni(II) and Zn(II), square-planar geometry for Cu(II) and tetrahedral configuration for Cd(II) and Hg(II) complexes.