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South African Journal of Chemistry
On-line version ISSN 1996-840X
Print version ISSN 0379-4350
S.Afr.j.chem. (Online) vol.63 Durban 2010
RESEARCH ARTICLE
Electrocatalytic activity of electropolymerized cobalt tetraaminophthalocyanine film modified electrode towards 6-mercaptopurine and 2-mercaptobenzimidazole
Jie-Ping FanI,III, *; Xiao-Min ZhangIII; MinYingII,III
ISchool of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, P. R. China
IIZhejiang Wanli University, Ningbo 315100, P. R. China
IIIEast China Institute of Technology, Fuzhou 344100, P. R. China
ABSTRACT
The electrocatalytic activity of electropolymerized cobalt tetraaminophthalocyanine (poly-CoTAPc) film modified on the glassy carbon electrode (GCE) towards 6-mercaptopurine (6MP) and 2-Mercaptobenzimidazole (MBI) was studied. Comparing with the case at the unmodified GCE, the poly-CoTAPc film decreased the overpotential of oxidation of 6MP (1.0 x 10-3 mol L-1) and MBI (1.0 x 10-3 mol L-1) by 335 and 189 mV, respectively, and increased the peak current by about 3 and 2 times, respectively, while the reduction potential of the disulphide product of previous oxidation of 6MP shifted positively by 312 mV and the peak current increased by 40 times in 0.1 mol L-1 phosphate buffer solution (PBS, pH = 2.0). The poly-CoTAPc film exhibited efficiently electrocatalytic activity for 6MP and MBI with relatively high sensitivity, stability and long-life.
Keywords: Electrocatalysis, 6-mercaptopurine, 2-mercaptobenzimidazole, cobalt tetraaminophthalocyanine, electropolymeric film
Full text available only in PDF format.
Acknowledgements
We thank Professor Tebello Nyokong and Isaac Adebayo Akinbulu for useful discussion.The kind assistance of Professor Jean-Michel Savéant is gratefully acknowledged.
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Received 2 August 2010
Revised 20 September 2010
Accepted 26 September 2010
* To whom correspondence should be addressed. E-mail: jasperfan@163.com