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

作　　者：SHAN Jin huan WANG Li SHEN Shi gang SUN Han wen WANG An zhou 

机构地区：[1]Department of Chemistry,Hebei University,Baoding 071002,P.R.China

出　　处：《Chemical Research in Chinese Universities》2000年第3期218-222,共5页高等学校化学研究(英文版)

基　　金：Supported by the Natural Science Foundation of Hebei Province(No.2 95 0 6 6 )

摘　　要：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 [TeO 2- 4]. No effect was found with the addition of KNO 3 and no free radical was detected. In view of this, the dihydroxymonotelluratoargentate(Ⅲ) species(DMA) is assumed to be the active species. A plausible 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.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 [TeO 2- 4]. No effect was found with the addition of KNO 3 and no free radical was detected. In view of this, the dihydroxymonotelluratoargentate(Ⅲ) species(DMA) is assumed to be the active species. A plausible 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.

关 键 词：Dihydroxyditelluratoargentate(Ⅲ) GLYCOL Redox reaction Kinetics and mechanism 

分 类 号：O657.3[理学—分析化学]