Synthesis and Characterization of Novel Complexes of a Dipeptide Schiff Base Ligand Containing DL-alanyl-DL-alanine

Abstract

A new dipeptide Schiff base obtained by the condensation of DL-alanyl-DL-alanine with O-vanillin was synthesized and characterized by ¹H NMR spectroscopy. Cu(II), Zn(II), Ni(II) and Co(II) complexes were obtained with the dipeptide Schiff base. The COO stretching bands in the IR spectra suggest that carboxylate acts as a monodentate group when binding with metal. The ligand is coordinated to the central metal as tetradentate ligand. The bonding sites are the carboxylate oxygen, imino nitrogen, amide nitrogen and phenolic oxygen.