Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (4): 649-655.

• Articles • Previous Articles     Next Articles

Fabrication and Photoelectrochemical Properties of [Ru(bpy)2dppz]2+ on ITO Electrode Associated with the Oxidation of Guanine

GUO Qing-yu, LI Hong*, YANG Hui-yi and SHAO Jiang-yang   

  1. Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China
  • Received:2009-07-26 Revised:2009-11-13 Online:2010-07-25 Published:2010-10-01
  • Contact: LI Hong, E-mail: lihong@scnu.edu.cn
  • Supported by:

    Supported by the Natural Science Foundation of Guangdong Province, China(Nos.2004J1-C0091 and Z03020).

Abstract: Electrochemical assembly of [Ru(bpy)2dppz]2+{bpy=2,2′-bipyridine, dppz=dipyrido[3,2-a:2′,3′-c]phena- zine} on an ITO electrode in the presence of guanine and photoelectrochemical properties of the assembled layer were investigated. It has been found that [Ru(bpy)2dppz]3+/2+ can be assembled onto the ITO electrode by the method of repetitive voltammetric sweeping, and the assembly is enhanced by guanine. The peak currents of prewaves increase linearly up to a guanine concentration of 0.25 mmol/L. More importantly, upon illumination with 470 nm light source and at an applied potential of 0.2 V, cathodic current for the fabricated layer on the ITO electrode indicate a linear enhancement with the rise of guanine concentration. Meanwhile, [Ru(bpy)2dppz]2+ can be served as an excellent mediator to prompt the oxidation of guanine, and the mediated peak current increases linearly with added guanine concentration from 0.01 to 0.25 mmol/L. In addition, the assembly mechanism of [Ru(bpy)2dppz]2+ on the ITO electrode associated with the oxidation of guanine and the assistance of light irradiation were discussed.

Key words: Polypyridyl ruthenium(II) complex, Guanine, ITO, Assembly, Photoelectrochemistry