Synthesis and Characterization of Complexes of Copper(II), Nickel(II), Cobalt(II) and Zinc(II) with Histidine and Glycine or Alanine

Abstract

Abstract Complexes of Cu(II), Ni(II), Co(II) and Zn(II) with histidine and glycine or alanine have been synthesized and characterized by elemental analyses, molar conductance, IR and electronic spectra and magnetochemical measurements. The results prove that histidine is tridentate coordinating through the iminazole and α-amino nitrogens and the carboxylate group. Glycine or alanine act as bidentate ligands coordinating through the -NH2 and COO− groups. The complexes of Cu(II) and Zn(II) with histidine and glycine or alanine are octahedral whereas the Co(II) and Ni(II) complexes are binuclear structures with an octahedral arrangement around each Co(II) or Ni(II) atom.