Kinetics and Mechanism of the Oxidation of Glycol by Dihydroxyditelluratoargentate(Ⅲ) with Spectrophotometry

Chemical Research in Chinese Universities ›› 2000, Vol. 16 ›› Issue (3): 218-222.

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Kinetics and Mechanism of the Oxidation of Glycol by Dihydroxyditelluratoargentate(Ⅲ) with Spectrophotometry

SHAN Jin-huan, WANG Li, SHEN Shi-gang, SUN Han-wen, WANG An-zhou

Department of Chemistry, Hebei University, Baoding 071002, P. R. China

Received:1999-10-27 Online:2000-08-24 Published:2011-10-22
Supported by:
Supported by the Natural Science Foundation of Hebei Province(No.295066)

Abstract

Abstract: The kinetics of the oxidation of glycol by dihydroxyditelluratoargentate (Ⅲ) complex(DDA) was studied in alkaline medium with spectrophotometry(in a temperature range of 16.6—40 ℃). The first-order rates with respect to glycol and Ag(Ⅲ) were all found. The rates increased with the increase in [OH^-] and decreased with the increase in [TeO₄^2-]. No effect was found with the addition of KNO₃ and no free radical was detected. In view of this, the dihydrox-ymonotelluratoargentate(Ⅲ) species(DMA) is assumed to be the active species. Aplausible mechanism involving a two-electron transfer is proposed, and the rate equation derived from the mechanism can explain all experimental observations. Activation parameters of the rate-determining step and constants are evaluated.

Key words: Dihydroxyditelluratoargentate(Ⅲ), Glycol, Redox reaction, Kinetics and mechanism

SHAN Jin-huan, WANG Li, SHEN Shi-gang, SUN Han-wen, WANG An-zhou . Kinetics and Mechanism of the Oxidation of Glycol by Dihydroxyditelluratoargentate(Ⅲ) with Spectrophotometry[J]. Chemical Research in Chinese Universities, 2000, 16(3): 218-222.

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Kinetics and Mechanism of the Oxidation of Glycol by Dihydroxyditelluratoargentate(Ⅲ) with Spectrophotometry

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