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Spectroscopic studies of copper (II) complexes with some amino acids

A. MARCU1, A. STANILA2, D. RUSU3, M. RUSU4, O. COZAR1, L. DAVID1,*

Affiliation

  1. ”Babes-Bolyai” University, Faculty of Physics, 400084 Cluj-Napoca, Romania
  2. Agricultural Sciences and Veterinary Medicine Univ., 400018 Cluj-Napoca, Romania
  3. “Iuliu Hatieganu” University Faculty of Pharmacy, 400032 Cluj-Napoca, Romania
  4. "Babes-Bolyai” University, Faculty of Chemistry, 400028, Cluj-Napoca, Romania

Abstract

Copper-amino acids complexes in aqueous solution: [Cu(L1)2]⋅H2O (L1=lysine), [Cu(L2)2 ]⋅H2O (L2=glycine) and [Cu(L3)2 ]⋅H2O (L3= leucine) were synthesized and analyzed by means of elemental analysis, thermogravimetric analysis, atomic absorption, FTIR, UV-VIS and EPR spectroscopies. The thermogravimetric analysis results are similar for all the complexes, the mass losses occurred in one or more steps until the complexes were destroyed and the copper oxide was formed. The atomic absorption spectroscopy and elemental analysis confirms the compounds stoichiometry. The FTIR spectra show that amino acids act as bidentate ligands with the coordination involving the carbonyl oxygen and the nitrogen atom of amino group. Powder EPR spectra at room temperature are typical for monomeric species with square-planar local symmetry around the metal ion, the principal values of the g tensor are: g||=2.180, g┴= 2.100 for 1, g||=2.205, g┴= 2.090 for 2 and g||=2.178, g┴= 2.112 for 3. The EPR spectra of the Cu (II) - amino acids complexes in DMF solution display the copper hyperfine structure (g0 ≈ 2.120, A0 ≈ 80 G)..

Keywords

Amino acids, Cu (II) complexes, FTIR spectroscopy, UV-VIS spectroscopy, EPR spectroscopy.

Submitted at: Nov. 15, 2006
Accepted at: March 15, 2007

Citation

A. MARCU, A. STANILA, D. RUSU, M. RUSU, O. COZAR, L. DAVID, Spectroscopic studies of copper (II) complexes with some amino acids, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 741-746 (2007)