摘要
(中国乐凯胶片厂,保定071051)在碱性介质中用分光光度法研究了二过碲酸合铜?配离子(DTC)氧化乙二醇一乙醚(EGE)的反应动力学及机理。反应速率表明:反应对DTC为准一级,对EGE为分数级;在保持准一级条件(犤EGE犦犤DTC犦)下,表观速率常数随着OH-浓度的增加而增大,随着TeO42-浓度的增加而减小;有负的盐效应。据此提出了包括配离子和EGE形成络合物的前期平衡的反应机理,由假设反应机理推出的速率方程能很好的解释全部实验现象,进一步求得速控步的速率常数和活化参数。
) The kinetics of the oxidation of ethylene glycol monoethyl ether (EGE) by ditelluratocuprate? complex (DTC) was studied in alkaline medium with spectrophotometry. The reaction rate showed pseudo first order dependence in oxdation and fractional order in EGE.It was found that the pseudo first order(under the condition:) rate constants kobs increased with the increase in and decrease in . There is a negative salt effect. A mechanism involving a preequilibrium of a adduct formation between the complex and EGE was proposed. The rate equation derived from the mechanism can explain all the experimental results. The activation parameters along with the rate constants of the rate determining step were calculated.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2002年第2期143-146,共4页
Chinese Journal of Inorganic Chemistry
基金
河北省自然科学基金资助项目(No.295066)
