Preparation and characterization of some transition metal mixed ligand complexes (Part 1)

Abstract

New mixed ligand complexes have been prepared by reaction of chloride salts of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with Schiff bases 2-((E)-4-((E)-phenyl-diazenyl) phenylimino) methyl ) phenol [ (PDIMP) = (HL1) ] and (Z)-2-((p-Tolylimino)methyl) phenol [ (TIMP) = (HL2) ]. The resulting complexes were characterized by available techniques such as elemental analysis, determination of metal content M% , molar conductances, magnetic moment measurements, UV-Vis and IR spectral studies. The Schiff bases acts as a monobasic bidentate ligands, coordinating through deprotonated phenolic oxygen and azomethine nitrogen atoms. The complexes are non-electrolytic in DMSO. From the analytical and spectral data the stoichiometry of these complexes have been found to be [M(L1)(L2)(H2O)2] {where M = Mn(II), Co(II), or Ni(II), }, and [M′(L1)(L2)]. where M′ = {Cu(II),or Zn(II)}. The presence of the two coordinated water molecules in these complexes was indicated by IR spectra and (C.H.N) analysis of the complexes. The electronic absorption spectra and magnetic susceptibility measurements suggest the square planar geometry for the copper(II) ion, and tetrahedral geometry for the zinc(II) ion, but the other metal complexes show octahedral geometry. Keywords: Preparation, Characterization , Schiff bases, Mixed ligand complexes.