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has been cited by the following article:

• TITLE: Catalytic Activity of Amino Acids-Metal Complexes in Oxidation Reactions

  AUTHORS: Krassimir Vassilev, Sevdalina Turmanova, Emilya Ivanova, Victotia Trifonova

  KEYWORDS: DL-Lysine; L-Methionine; Metal Complexes; Structure; Properties; Catalysis; Oxidation

  JOURNAL NAME: Journal of Biomaterials and Nanobiotechnology, Vol.4 No.2A, April 17, 2013

  ABSTRACT: Studies were carried out to determine the activity of complexes of the essential amino acids DL-Lysine and L-Methionine with heavy metals in the oxidation of cyclohexene with tert-butylhydroperoxide in toluene at 80°C. All complexes were prepared through interaction of metal ions and DL-Lysine and L-Methionine at room temperature in aqueous solutions. Only the complexes of Mo and W were obtained from acidic aqueous solution. These complexes were characterized by FT-IR, Moessbauer spectroscopy and EPR analysis. The products of the oxidation reactions were identified by GC/MS analysis. The complexes of Mo and V showed the best activity in the epoxidation reaction of cyclohexene in comparison with other complexes, such as Ni, Mn, Zn, Co, Cu, Cr, Fe and W. Using semi-empirical quantum-chemistry methods, the full energy of the Mo complexes was calculated and their probable structure is presented.