MAGNETIC AND ELECTRONIC SPECTRAL STUDIES OF FOUR, FIVE AND SIX COORDINATED COMPLEXES OF SUBSTITUTED HYDRAZIDE AND HYDRAZONES WITH DIVALENT NICKEL AND COBALT METAL IONS

Metal complexes of divalent Nickel and Cobalt metal ions have been synthesized with picolinic acid hydrazide (PH) , ortho -hydroxy acetophenone picolinoyl hydrazone ( APH) ortho-hydroxy iso-nicotinoyl (AIH) ligands were isolated at both high pH low pH. These characterized by elemental analyses also electronic spectral studies magnetic measurements. Ligands PH AIH act as tridentate, while APH is tetradentate. All form two types complexes, depending upon the reaction mixture. At formed are monomeric found to be dimeric. Dimerisation initiated enolic oxygen which acts like a bridging ligand between ions.