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.