Thin-layer Spectroelectrochemistry of 3,3′,5,5′-Tetramethyl-benzidine on Pt Minigrid Optically Transparent Electrode  

作　　者：KuiJIAO TaoYANG ZengJianWANG 

机构地区：[1]CollegeofChemistryandMolecularEngineering.QingdaoUniversityofScienceandTechnology.Qingdao266042 [2]CollegeofChemistryandChemicalEngineering.OceanUniversityofChina,Qingdao266003

出　　处：《Chinese Chemical Letters》2005年第5期655-658,共4页中国化学快报（英文版）

基　　金：The project was supported by the National Natural Science Foundation of China(Grant No.20075013).

摘　　要：The electrooxidation behavior of 3, 3′,5, 5′-tetramethylbenzidine(TMB) was investigated using a platinum minigrid optically transparent thin-layer spectroelectrochemical cell. TMB underwent one two-electron electrooxidation process to yield quinonediimine in the pH range from 2.0 to < 4.0, and two consecutive one-electron electrooxidation processes, gave the mediate product free radical of TMB first, then gave the oxidation product quinonediimine in the pH range from 4.0 to < 7.0. In the pH range from 7.0 to 10.0, the electrooxidation of TMB was also one two-electron electrooxidation process to yield an azo compound. The formal potential E0'and the electron transfer number of the electrooxidation of TMB at pH 2.0 and pH 8.4 were determined by spectroelectrochemical techniques.The electrooxidation behavior of 3, 3′,5, 5′-tetramethylbenzidine(TMB) was investigated using a platinum minigrid optically transparent thin-layer spectroelectrochemical cell. TMB underwent one two-electron electrooxidation process to yield quinonediimine in the pH range from 2.0 to < 4.0, and two consecutive one-electron electrooxidation processes, gave the mediate product free radical of TMB first, then gave the oxidation product quinonediimine in the pH range from 4.0 to < 7.0. In the pH range from 7.0 to 10.0, the electrooxidation of TMB was also one two-electron electrooxidation process to yield an azo compound. The formal potential E0'and the electron transfer number of the electrooxidation of TMB at pH 2.0 and pH 8.4 were determined by spectroelectrochemical techniques.

关 键 词：Thin-layer spectroelectrochemistry 3 3′ 5 5′-tetramethylbenzidine platinum minigrid  optically transparent electrode electrooxidation. 

分 类 号：O625.13[理学—有机化学]