Oxygen-Exchange Reactions Accompanying Oxidation of Vanadyl Sulfate by Diperoxovanadate

Ravishankar, HN and Chaudhuri, MK and Ramasarma, T (1994) Oxygen-Exchange Reactions Accompanying Oxidation of Vanadyl Sulfate by Diperoxovanadate. In: Inorganic Chemistry, 33 (17). 3788 -3793 .

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Abstract

The absorption spectrum in the visible range and the, ESR spectrum of vanadyl sulfate were lost on addition of diperoxovanadate. The V-51-NMR spectra revealed that diperoxovanadate was reduced to vanadate and its oligomers. With excess vanadyl, tetrameric vanadate was found to be the major product, During this reaction oxygen was released into the medium. The oxygen-release reaction was inhibited by a variety of organic ligands-imidazole, benzoate, formate, mannitol, ethanol, Tris, DMPO, malate, and asparagine. An oxygen-consuming reaction emerged at high concentrations of some of these compounds, e.g. benzoate and ethanol. Using DMPO as the spin-trap, an oxygen-radical species with a 1:2:2:1 type of ESR spectrum was detected in the reaction mixtures resulting from vanadyl oxidation by diperoxovanadate which was unaffected by addition of catalase or ethanol. The results showed that secondary oxygen-exchange reactions occur which depend on and utilize the intermediates in the primary reaction during diperoxovanadate-dependent oxidation of vanadyl sulfate.

Item Type:	Journal Article
Publication:	Inorganic Chemistry
Publisher:	American chemical society
Additional Information:	Copyright of this article belongs to American chemical society.
Department/Centre:	Division of Biological Sciences > Biochemistry
Date Deposited:	08 Apr 2011 09:06
Last Modified:	08 Apr 2011 09:06
URI:	http://eprints.iisc.ac.in/id/eprint/36674

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