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利用电化学方法和ESR(电子自旋共振)-电化学联用技术在无水乙醇体系中研究了藏红T(ST)的电化学还原行为。通过就地跟踪其1-电子还原的中间产物——自由基,推测了该自由基的结构。观察到ST电化学还原过程中存在着后续的、平行的零级和一级衰变反应。这一事实使有的电极反应与酶催化反应相关联的论点进一步得到实验的印证和支持。根据对不同浓度的ST溶液在不同还原电位下生成自由基行为研究结果,提出了ST在该溶液体系中的还原机理,并用曲线拟合法推算了反应历程中有关步骤的动力学参数。
The electrochemical reduction behavior of safranin T (ST) was studied in an ethanol-free system using electrochemical methods and ESR (Electron Spin Resonance) -electrochemical chemistry. The structure of the free radical was speculated by in-situ tracking of its 1-electron-reduced intermediates, the free radical. It was observed that there was a follow-up, parallel zero-order and first-order decay reaction in ST electrochemical reduction process. This fact makes some of the electrode reaction and enzymatic reaction associated arguments further confirmed by the experiment and support. Based on the results of the studies on the formation of free radicals at different reduction potentials of ST solutions with different concentrations, the reduction mechanism of ST in this solution system was proposed and the kinetic parameters of the relevant steps in the reaction process were deduced by curve fitting.