KINETICS AND MECHANISM OF OXIDATION OF PENTAERYTHRITOL BY DITELLURATOARGENTATE(III) IN ALKALINE MEDIUM

Journal of The Chilean Chemical Society

GANG, BIAN¹  JIN-HUAN, SHAN¹  CAI-HONG, YIN¹  YAN-PING, LIU¹ 

[1] Hebei University, Baoding, P.R.China

关键词: Ditelluratoargentate(III)(DTA);    pentaerythritol;    redox reaction;    reaction kinetics;    mechanism;    fractional order;    kobs;    OH-;    H4TeO62-;    rate equations.;   

DOI  :  10.4067/S0717-97072013000200011

学科分类：化学（综合）

来源: Sociedad Chilena de Quimica

【 摘 要 】

The kinetics of oxidation of pentaerythritol 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 pentaerythritol. 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 is proposed and the rate equations derived from the mechanism can explain all the experimental results. The rate equations derived from mechanism can explain all experimental observations. The activation parameters along with the rate constants of the rate-determining step were calculated.

【 授权许可】

Unknown