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Structural investigations of some metallic complexes with threonine as ligand

A. MARCU1, A. STANILA2, 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

Abstract

The complexes [Cu(L)2]⋅H2O, [Co(L)2]⋅2H2O and [Zn(L)2]⋅H2O with threonine (L) as ligand were synthesized and characterized by means of atomic absorption, elemental analysis, FT-IR, UV-VIS and ESR spectroscopies. The free ligand and the complexes exhibit similar spectra in the UV region in relation to the number of absorption bands. The n→ π* characteristic band in the UV spectra assigned to the C=O bond appear at 267.5 nm for threonine and is shifted toward higher wave lengths in the complexes spectra proving the covalent nature of the metal-ligand bond. The FT-IR spectra show that the amino acid acts as bidentate ligand with the coordination involving the carbonyl oxygen and the nitrogen atom from amino group. The ν(N-H) stretching vibration appears at ≈ 3176 cm-1 and ≈ 3161 cm-1 in the ligand spectrum, and is shifted toward lower wave numbers in the complexes spectra proving the involvement of the –NH2- group in the complex formation. Powder EPR spectra at room temperature are typically for pseudotetrahedral local symmetry around the copper ion and octahedral symmetry for the cobalt ion..

Keywords

Metal complexes, Threonine, FT-IR spectroscopy, ESR.

Submitted at: Feb. 25, 2008
Accepted at: April 4, 2008

Citation

A. MARCU, A. STANILA, O. COZAR, L. DAVID, Structural investigations of some metallic complexes with threonine as ligand, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 830-833 (2008)