Synthesis and Characterization of Mn2+, Fe2+, Co2+ and Ni2+, Complexes of Schiff base derived from Phenylene Diamines and 3-Carboxaldehyde

Abstract

Schiff bases synthesized by the reaction of pyridine-3-carboxaldehyde with o-phenylene diamine (COPDE) and m-phenylene diamine (CMPDE) form monomeric and dimeric complexes with divalent Mn²⁺, Fe²⁺, Co²⁺ and Ni²⁺ ions. Square planar geometry has been assigned to [M(L)₂]Cl₂ complexes; whereas M₂(L)₄Cl₂, M₂(L)₄(NO₃)₂ [(ML₂·2H₂O)]SO₄ and ML₂(CH₃COO)₂ complexes are octahedral (M = Mn²⁺, Fe²⁺, Co²⁺ and Ni²⁺; L = COPDE or CMPDE). Structures of complexes have been assigned on the basis of elemental analysis, molar conductance, molecular weight determination, IR, UV and magnetic moment values data.