Spectroscopic investigations of new metallic complexes with leucine as ligand

Abstract

The [Cu(L)2]·H2O (1), [Co(L)2]·2H2O (2) and [Zn(L)2]·H2O (3) complexes with leucine (L) as ligand, were synthesized in water solution and analyzed by physical–chemical and spectroscopic means (UV–VIS, FT-IR, ESR). The comparative analysis of the IR spectra for the ligand and the complexes indicate the coordination of the metallic centre to the carboxylic oxygen atom and the nitrogen atom of the amino group due to the shift of the νs(CO) and νs(NH) stretching vibrations. Spectral UV–VIS and ESR data confirmed the covalent metal–ligand bonds, the pseudotetrahedral symmetry around the copper and zinc ions and the octahedral environment for the cobalt ion.