Hexacyan oferrate as the Electrochemical Probe for 2-Mercaptobenzothiazole Modified Gold Electrode

Chemical Research in Chinese Universities ›› 1999, Vol. 15 ›› Issue (2): 122-127.

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Hexacyan oferrate as the Electrochemical Probe for 2-Mercaptobenzothiazole Modified Gold Electrode

XU Jing-juan, FANG Hui-qun, CHEN Hong-yuan

Department of Chemistry, the State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093

Received:1998-10-09 Online:1999-04-24 Published:2011-08-17
Supported by:
Supported by the National Natural Science Foundation of China and the Grant of the National Education Ministry of China.

Abstract

Abstract: A gold electrode covered with self-assembled monolayers of 2-mercaptobenzothiazole(Au/MBT) has been developed, its electrochemical characteristics have been investigated in detail. Using hexacyan oferrate as the electrochemical probe for studying the characteristics of the MBT monolayer film, the results, obtained by A. C. impedance spectroscopy technique, show that the electron transfer of hexacyan oferrate(Ⅱ) on Au|MBT in higher pH media was more difficult than that obtained in H₂SO₄ medium or on a bare gold electrode. The electrochemical reversibility of Fe(CN)₆^3-/Fe(CN)₆^4- changed with pH of the solution due to the proton, deproton states of N atom of MBT. The relationship between the coverage of MBT on Au surface or pH, the apparent heterogeneous rate constant was derived, discussed. The double layer capacitance of Au|MBT is (76.4±5.5) μF/cm². The characteristic frequency was dependent on the pH of the solution.

Key words: 2-Mercaptobenzothiazole, Self-assembly, Resistance, Capacitance

XU Jing-juan, FANG Hui-qun, CHEN Hong-yuan . Hexacyan oferrate as the Electrochemical Probe for 2-Mercaptobenzothiazole Modified Gold Electrode[J]. Chemical Research in Chinese Universities, 1999, 15(2): 122-127.

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Hexacyan oferrate as the Electrochemical Probe for 2-Mercaptobenzothiazole Modified Gold Electrode

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