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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/122/03/0335-0340

    • Keywords

       

      Thioglycolic acid; heteropoly 10-tungstodivanadophosphate; outer sphere electron transfer reactions; Marcus theory; Rehm-Weller relationship.

    • Abstract

       

      Rates of electron transfer reaction of thioglycolic acid with vanadium(V) substituted Keggintype heteropolyanion, [PVVVVW10O40]5-, in acetate-acetic acid buffers have been measured spectrophotometrically at 25°C. The order of the reaction with respect to substrate and oxidant is unity. The reaction shows simple second order kinetics at constant pH. The rate of the reaction increases with increase of pH of the medium. The mono-anion HSCH2COO- and di-anion -SCH2COO- are found to be the reactive species. Rate constants for mono-anion and di-anion are evaluated from rate law derived from the mechanism. By applying Rehm-Weller relationship, self exchange rate constant for the -SCH2COO-/S$^{\bullet}$ CH2COO- couple was evaluated as $3.3 \times 10^3$ dm3 mol-1 s-1 at 25°C.

    • Author Affiliations

       

      Ponnusamy Sami1 Natarajan Mariselvi1 Kandasamy Venkateshwari1 Arunachalam Sarathi1 Kasi Rajasekaran1

      1. Post Graduate Department of Chemistry, V.H.N. Senthikumara Nadar College, Virudhunagar 626 001

    • Dates

       
      Published
      May 2010
      Manuscript received
      9 July 2009
      Accepted
      22 January 2010

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