Trinuclear metal complexes with hexadentate Schiff base ligand derived from diacetylbis p-phenylendiamine and salicylaldehyde

Abstract

A number of trinuclear complexes with hexadentate Schiff base ligand H2L= (a condensation product of diacetylbis p-phenylendiamine and salicylaldehyde ) have been prepared . The synthesized complexes having formula [ M2M- (H2L)2 Cl4]Cl2 and [M2M- (L)2]Cl2 ; where M = Co(II) , Ni(II) , Cu(II) and M- = Zn(II) , Cd(II) , Hg(II) . H2L and L the neutral and dibasic forms of Schiff base . The complexes were prepared by the reaction of metal chloride with the ligand in both neutral and basic media . The ligand and its complexes were studies by means of chemical physical and spectral methods. These studies were revealed that the Schiff base act as neutral hexadentate and dibasic hexadentate ligand coordinated through the azomethine nitrogen and phenolic oxygen atoms in neutral and basic media .These studies suggested an octahedral geometry or square planar for two side metal ions in neutral and basic media respectively; The central metal atom is tetra – coordination in all complexes .