物理化学学报 >> 1993, Vol. 9 >> Issue (01): 70-76.doi: 10.3866/PKU.WHXB19930112

研究论文 上一篇    下一篇

停止流动法研究K2FeO4氧化乙醇胺的动力学

高英; 王之朴   

  1. 河北大学化学系,保定 071002
  • 收稿日期:1991-08-05 修回日期:1992-07-06 发布日期:1993-02-15
  • 通讯作者: 王之朴

Study on the Kinetics and Mechanism of Oxidation of Ethanolamide with Potassium Ferrate (VI) by the Stopped-Flow Method

Gao Ying; Wang Zhi-Pu   

  1. Department of Chemistry, Hebei University, Baoding 071002
  • Received:1991-08-05 Revised:1992-07-06 Published:1993-02-15
  • Contact: Wang Zhi-Pu

摘要: 用停止流动分光光度法在pH=9.89-10.70范围内, 研究了商铁酸钾氧化乙醇胺反应的动力学及其机理. 研究结果表明: 反应对高铁酸钾和乙醇胺均为一级; 对OH~-为负分数级; 离子强度对速率没有影响. 提出了一个包含有离子与分子间通过氢桥进行双电子转移的反应机理, 由此导出了能圆满解释所有实验事实的速率方程, 并求得了有关的速率常数.

关键词: 停止流动法, 高铁酸钾, 乙醇胺, 动力学及机理

Abstract: The kinetics and mechanism of oxidation of ethanolamide by potassium ferrate(Ⅵ) in the pH range of 9.89 to 10.70 has been investigated spectrophotometrically by the stoppedflow method. The order both with respect to potassium ferrate and ethanolamide was found to be unity and that with respect to OH a negative fraction. There was no effect on the variation of ionic strength. A mechanism which includes a twoelectron transfer throngh hydrogen bridge between the ion and the molecule was suggested. The rate equation derived from this mechanism can explain all the observed experimental facts satisfactorily and some rate constants were obtained.

Key words: Kinetics and Mechanism, Stopped-flow method, Potassium ferrate, Ethanolamide