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Journal of Chemistry
Volume 2013, Article ID 793560, 4 pages
http://dx.doi.org/10.1155/2013/793560
Research Article

Kinetics and Mechanism of Oxidation of Triethylene Glycol and Tetraethylene Glycol by Ditelluratoargentate (III) in Alkaline Medium

College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China

Received 25 February 2012; Accepted 26 April 2012

Academic Editor: Nianjun Yang

Copyright © 2013 Jinhuan Shan and Caihong Yin. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The kinetics of oxidation of triethylene glycol and tetraethylene glycol by ditelluratoargentate (III) (DTA) in alkaline liquids has been studied spectrophotometrically in the temperature range of 293.2 K–313.2 K. The reaction rate showed first-order dependence in DTA and fractional order with respect to triethylene glycol or tetraethylene glycol. It was found that the pseudo-first-order rate constant (𝑘obs) increased with an increase in concentration of OH− and a decrease in concentration of H4TeO62−. There was a negative salt effect and no free radicals were detected. A plausible mechanism involving a two-electron transfer was proposed, and the rate equations derived from the mechanism explained all the experimental results and observations. The activation parameters along with the rate constants of the rate-determining step were calculated.