South African Journal of Chemistry
On-line version ISSN 1996-840X
Print version ISSN 0379-4350
FAN, Jie-Ping; ZHANG, Xiao-Min and YING, Min. Electrocatalytic activity of electropolymerized cobalt tetraaminophthalocyanine film modified electrode towards 6-mercaptopurine and 2-mercaptobenzimidazole. S.Afr.j.chem. (Online) [online]. 2010, vol.63, pp.145-151. ISSN 1996-840X.
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.