乙酰乙酸乙酯－BR化学振荡反应的研究  

STUDY ON THE CHEMICAL OSCILLATION IN ACETYLACETIC ACID BR SYSTEM Li Hexing * Shen Zhenwen Zhao Wei (Dept.of Chem.,Shanghai Norm.Univ.,Shanghai,200234,P.R.China)

作　　者：李和兴[1] 沈振文 赵玮[1] 黄岩[1] 黄小军[2] 

机构地区：[1]上海师范大学化学系 [2]复旦大学化学系

出　　处：《化学研究与应用》1996年第3期397-401,共5页Chemical Research and Application

基　　金：上海市科委"启明星"基金

摘　　要：本文首次报道了乙酰乙酸乙酯－ＩＯ－３－Ｈ２Ｏ２－Ｍｎ２＋－Ｈ２ＳＯ４体系的化学振荡反应。研究了各种因素对振荡反应的影响，测定了最佳反应条件及振荡反应的浓度范围。研究了温度变化对振荡反应的影响，并计算了振荡反应的表观活化能，对振荡反应产物进行了分析，并测定了体系主要反应的计量关系，采用ＵＶ法对金属离子的作用和催化机理作了研究，探索了ＢＲ反应中Ｉ２的产生机理及消耗机理，对体系中有关反应物的作用作了说明。在ＦＫＮ机理的基础上，对ＢＲ反应的自催化反应步骤和控制机理进行了初步的探索，并对有关实验现象作了说明。A new Briggs-Rauchers(BR) oscillating reaction with ethyl acetoacetate as the organic substrate has been described.The oscillating features have been investigated in detial.The effects of many factors,such as the chloride ion,iodide ion,metal ions,et.al.,on the oscillations have been studied.Also,the effects of the reactant′s concentrations on the oscillation have been studied and the quantitative corelation between the oscillating parameters and concentrations have been determined.The effect of the reaction temperature on the oscillation has been detected and average activation energies of the reaction during the induction period and the oscillating period have been calculated.Meanwhile,the role of the metallic ions in the oscillation have been studied.The reaction ratio between iodate and the organic substrate has been detemined as 1∶1.Subsequently,the overall chemical reaction in the title system has been determined as follows: IO - 3+CH 3COCH 2COOCH 2CH 3+2H 2O 2+H +=CH 3COCH(I)COOCH 2CH 3+2O 2+3H 2O At last,the oscillating phenomena and the classical Belousov-Zhabotinsky(BZ) system have been compared.According to the above analysis,the oscillating mechanism in this system has been proposed.Some of the oscillating features have been discussed and explained according to the proposed mechanism.

关 键 词：乙酰乙酸乙酯 BR 化学振荡 温度 活化能 

分 类 号：O623.624[理学—有机化学]