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计时电量法测定4,5-二氮芴-9-酮的扩散系数和反应速率常数

Keywords: 4,5-二氮芴-9-酮,循环伏安,计时电量,扩散系数,反应速率常数

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Abstract:

运用循环伏安法测定4,5-二氮芴-9-酮(DAFO)在DMF溶液中不同扫描速率时的循环伏安图,出现2对峰形良好的氧化还原峰;采用计时电量法通过控制阶跃电位,测得不同温度下DAFO在DMF溶液中的扩散系数和反应速率常数,293K时扩散系数为5.39×10-6cm2·s-1;当选择阶跃电位使电极过程处于扩散和电化学混合控制时,测得不同电位的反应速率常数kf.根据不同温度下的标准速率常数k0,得到表观活化能Ea为10.5kJ·mol-1.

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