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Structural investigations of some transitional metals with hystidine as ligand

A. MARCU1,* , A. STANILA2, M. RUSU3, D. CHICEA4, 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. “Babes-Bolyai” University, Faculty of Chemistry, 400028, Cluj-Napoca, Romania
  4. “L. Blaga” University , Dpt. of Physics, 5500132, Sibiu, Cluj-Napoca, Romania

Abstract

The metal-amino acids complexes have different applications as antibacterial agents against Staphylococcus aureus, Streptococcus pyogene, Escherichia coli and also as nutritional supplements. The [Cu(L)2]·H2O (1), [Co(L)2]⋅2H2O (2) and [Zn(L)2]·H2O (3) complexes with hystidine (L) as ligand, were synthesized in water solution and analyzed by means of: elemental analysis, atomic absorption, FT-IR, UV-VIS and EPR spectroscopies. The atomic absorption spectroscopy and elemental measurements confirm the 1:2 metal ions: hystidine ratio composition for the synthesised compounds. Through FT-IR spectroscopy were obtained information about the metals ions coordination. In the spectrum of the ligand the νs(N– H) stretching vibration appears at 3082 cm-1 and is shifted toward higher wave numbers in the spectra of the complexes proving the involvement of the –NH2– group in the complex formation. The ν(C=O) stretching vibration emerge in the ligand spectrum at 1630 cm-1 and is shifted in the complexes spectra with 5 cm-1 (for 1), 11 cm-1 (for 2) and 16 cm-1 (for 3) confirming the involvement of the carboxylic group in the metal ions covalent bonding. The local symmetry of the metals ions were obtained by comparing the ligand UV-VIS spectra with those of amino acid complexes. Spectral data confirmed the covalent bond of metals-ligand and the octahedral symmetry around the cobalt ion. Powder EPR spectrum at room temperature of complex 1 is quasi-isotropic (g= 2.110) and is characteristic for an Oh symmetry around the copper ion and the octahedral symmetry around the cobalt ion..

Keywords

Metal complexes, Histidine, FT-IR, ESR, UV-VIS.

Submitted at: Feb. 25, 2008
Accepted at: Aug. 28, 2008

Citation

A. MARCU, A. STANILA, M. RUSU, D. CHICEA, L. DAVID, Structural investigations of some transitional metals with hystidine as ligand, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 9, pp. 2351-2354 (2008)