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Citation: YANG Tao, JIAO Kui, WANG Zeng-Jian. A Thin-layer Spectroelectrochemical Study of 3,3',5,5'-Tetramethylbenzidine at Optically Transparent Pt Minigrid Electrode[J]. Chinese Journal of Applied Chemistry, ;2005, 22(4): 355-360. shu

A Thin-layer Spectroelectrochemical Study of 3,3',5,5'-Tetramethylbenzidine at Optically Transparent Pt Minigrid Electrode

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

Corresponding author: JIAO Kui,
Received Date: 21 June 2004
Available Online: 6 November 2004
Fund Project: 国家自然科学基金资助项目(20075013) (20075013)

The electrooxidation of 3,3',5,5'-tetramethylbenzidine (TMB) was investigated at a platinum minigrid electrode by means of UV-Vis optically transparent thin-layer electrochemistry technique.In the (B-R) buffer solution,TMB (underwent) a one-step two-electron electrooxidation in the pH range from 2.0 to <4.0 with a product quinonediimine,and two successive one-electron electrooxidation processes in the pH range from 4.0 to <7.0,to yield a mediate product TMB-free radical first,and then the complete oxidative product quinonediimine.At pH 8.4,the electrooxidation of TMB was also a quasi-reversible two-electron-transfer process to yield an azo compound.Several spectroelectrochemical techniques,such as thin-layer cyclic voltammetry,thin-layer cyclic voltabsorptometry,thin-layer potential-controlled electrolysis absorptometry,thin-layer single-potential-step chronoabsorptometry,and thin-layer double-potential-step chronoabsorptometry were applied to this investigation.The formal potential E^0' and the electron transfer number corresponding to the electrooxidation of TMB in the B-R buffer solution at different pH values were determined.
- tetramethylbenzidine,
- thin-layer spectroelectrochemistry,
- electrooxidation,
- optically transparent Pt minigrid electrode
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