紫脲酸氧化的伏安法研究

A Voltammetric Study of Violuric Acid Oxidation

紫脲酸氧化过程涉及质子耦合电子转移过程,循环伏安法的结果表明,随着pH值的增大,紫脲酸氧化反应分别表现为单电子转移、两电子单质子转移及单电子单质子转移,更重要的是,在以水为添加剂(或可以认为是质子受体)的乙腈溶液中,水与紫脲酸可能会形成氢键,该复合物的形成会显著提高紫脲酸氧化反应速率。

The oxidation of violuric acid involves proton coupled electron transfer process,cyclic voltammograms results indicate that with the increasing of pH values,violuric acid oxidation show three types of charge transfer:single electron transfer,two electron/one proton transfer or one electron/one proton transfer.More importantly,in the acetontrile electrolytes with water as additive(or proton acceptor),water can form hydrogen bonding complex with violuric acid,and this complex formation can increase the rate constant of violuric acid oxidation significantly.