Citation: Kui JIAO, Tao YAN G, Zeng Jian WANG. Thin-layer Spectroelectrochemistry of 3, 3',5, 5'-Tetramethyl-benzidine on Pt Minigrid Optically Transparent Electrode[J]. Chinese Chemical Letters, ;2005, 16(5): 655-658. shu

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

1.
College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042;
2.
College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003

Received Date: 24 May 2004

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

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 E^0' and the electron transfer number of the electrooxidation of TMB at pH 2.0 and pH 8.4 were determined by spectroelectrochemical techniques.
- Thin-layer spectroelectrochemistry,
- 3,3'5,5'-tetramethylbenzidine,
- platinum minigrid optically transparent electrode,
- electrooxidation
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