R. Goyal, U. Singh, Adil A. Abdullah
May 1, 2004
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Journal
Indian journal of chemistry. Sect. A: Inorganic, physical, theoretical & analytical
Abstract
6-Thioxanthine has been studied in phosphate buffers of pH 1.2 - 11.0 using linear and cyclic sweep voltammetry, coulometry, controlled potential electrolysis and spectral studies. Two well-defined oxidation peaks, I a (le, 1H + , pH range 1.2-6.0) and II a (8e, 8H + , pH range 1.2-11.0) are observed. A reduction peak, III c , is noticed in the reverse sweep. Kinetic studies indicate that the decay of the UV- absorbing intermediate is a first order reaction. The studies show that in acidic medium, thin group of 6-thioxanthine exists as S-H, whereas in neutral and basic medium thio group is in the form of C=S. The products of electrooxidation have been characterized and a tentative EC mechanism has been suggested for the oxidation of 6-thioxanthine.