Catalytic Activity of Amino Acids-Metal Complexes in Oxidation Reactions

Krassimir Vassilev, Sevdalina Turmanova, Emilya Ivanova, Victotia Trifonova

Department of Biotechnology, “Professor Assen Zlatarov” University, Burgas, Bulgaria.
Department of Inorganic Chemistry, “Professor Assen Zlatarov” University, Burgas, Bulgaria.
Department of Materials Science, “Pro- fessor Assen Zlatarov” University, Burgas, Bulgaria.

DOI: 10.4236/jbnb.2013.42A004                

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.

Keywords

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

Conflicts of Interest

The authors declare no conflicts of interest.

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