SYNTHESIS AND CHARACTERIZATION OF NEW OXODIPEROXOVANADATE COMPLEXES CONTAINING COORDINATED AMINOACIDS

The study of peroxovanadium compounds has received renewed attention since the discovery of their insulin mimetic properties and of the vanadium bromoperoxidase enzyme which catalyzes the oxidation of halides by hydrogen peroxide. This work presents the synthesis and characterization of three novel oxodiperoxovanadium complexes, K n [VO(O 2 ) 2 AA] 2H 2 O, where AA = L-asparagine(l), L-phenylglycine(2), D, L-homocystine(3). The products were synthesized by the reaction of V 2 O 5 , with the amino acid and H 2 O 2 at room temperature. The compounds obtained are yellow, soluble in water and insoluble in organic solvents. They show remarkable hygroscopic character and are light and temperature sensitive. IR and UV-VIS spectra of the compounds show the typical oxo and diperoxo bands (ν v = o = 970 cm −1 , ν vo-o = 870cm −1 , νv-O 2 = 630, 525 cm −1 , ⋋ ≅320nm). The ligand bonding properties were determined on the basis of electric conductivity and spectroscopic data (IR, 1 H NMR) as well as elemental analysis.