高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (11): 1607.

• 论文 • 上一篇    下一篇

双水杨醛缩乙二胺烷基钴(Ⅲ)配合物电化学氧化动力学的研究

朱世民, 张天谊   

  1. 南京大学化学系, 南京, 210093
  • 收稿日期:1993-12-05 修回日期:1994-04-28 出版日期:1994-11-24 发布日期:1994-11-24
  • 通讯作者: 朱世民,男,56岁,副教授.
  • 作者简介:朱世民,男,56岁,副教授.
  • 基金资助:

    国家自然科学基金

Kinetic Study on Electrochemical Oxidation of Alkyl Cobalt Schiff Base Complexes RCo(Salen)

ZHU Shi-Min, ZHANG Tian-Yi   

  1. Department of Chemistry, Nanjing University, Nanjing, 210093
  • Received:1993-12-05 Revised:1994-04-28 Online:1994-11-24 Published:1994-11-24

摘要: 用循环伏安法、计时电流法、线性扫描伏安法及lgi~E法研究了双水杨醛缩乙二胺烷基钴(Ⅲ)配合物[RCo(Salen),R=CH3,C2H5,n-C4H9,i-C4H9]在Au电极上的电化学氧化动力学过程,测定了RCo(Salen)的电极反应的速率常数ks、电子转移数n1、电荷传递系数a、标准电极电位E0、扩散系数D;同时,还测定了氧化产物化学分解加速率常数kf及分解产物电解氧化的电子转移数n2等参数,实验表明RCo(Salen)的电化学反应是ECE过程,R基对E0、kf等均有影响。

关键词: 双水杨醛缩乙二胺烷基钴(Ⅲ)配合物, 循环伏安法, 线性扫描伏安法、计时电流法、动力学参数

Abstract: In this paper, the behavior of electrooxidative kinetic process of RCo(Salen)in DMF-TBAPsolution has been studied by cyclic voltammetry, chronoamperometry, linear sweep voltammetry, and lgi-Etechniques on micro gold wheel electrode. The kinetic parameters ks, n1, n2, D, a and kf have been obtained. The results showed that the oxidation of RCo(Salen) is an one electron transfer process coupled with chemical dissociation in which the dissociative product undergoes a second one electron transfer oxidation at the same potential to the initial electron transfer reaction. So, the overall oxidative process can best be described as ECEmechanism, The effect of alkyl group Ron E0 and kf is remarkable. E0 decreases in the order of CH3→C2H5→n-C4H9→i-C4H9. In the meantime, kf changes just in the opposite way.

Key words: Alkyl cobalt Schiff base complexes, Cyclic voltammetry, Linear sweep voltammetry, Chronoamperometry, Kinetic parameters

TrendMD: