Structural Aspects of Mixed Ligand Complexes of Ni(II) or Cu(II) Metal Chelates of Organic Acids with Ethylenediamine

Abstract

A series of mixed ligand complexes of the general formula ML₂L' have been synthesized and characterized, where M = Ni(II) or Cu(II); L = deprotonated organic acids such as o-nitrophenol (ONP), 2,4-dinitrophenol (DNP), 2,4,6-trinitrophenol (TNP), 8-hydroxyquinoline (8HQ), 1-nitroso-2-naphthol (IN2N), o-aminobenzoic acid (OABA); L' = ethylenediamine. These complexes have been characterized by elemental analysis, molar conductance measurements, magnetic moment measurements, IR, electronic and ¹H NMR spectral analysis. The IR spectra suggest coordination of transition metal Ni(II) or Cu(II) through nitrogen atom of -NH₂ group of ethylenediamine and N and/or O of the organic acid. The electronic spectral data and magnetic moment value suggest the octahedral geometry of the complexes.