Synthesis and Characterization of Mixed Ligand Complexes of Nickel(II) with Histidine and Hippuric Acid

Abstract

Mixed ligand complexes of nickel(II) with the composition

Na₂[Ni{(C₆H₅CONHCH₂COO)(C₆H₈N₃O₂)·H₂O}]·7H₂O and Na₂[Ni{(C₆H₅-

CONHCH₂COO)(C₆H₈N₃O₂).H₂O}]·H₂O formed with histidine and

hippuric acid have been synthesized. The mode of coordination and

their structures have been examined by elemental analysis, infrared,

electronic spectra and magnetic measurements. Histidine has shown a

tridentate behaviour with the coordination occurring through the carboxylate

oxygen atom and two nitrogen atoms of the imidazole and -NH₂

groups. Hippuric acid has been found to act as a bidentate ligand coordinating

through carboxylate oxygen atom and the nitrogen of the amido

group.