Yukari Sato, K. Uosaki
Mar 7, 1995
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Journal
Journal of Electroanalytical Chemistry
Abstract
Abstract The electrochemical and electrogenerated chemiluminescence (ECL) properties of gold and indium tin oxide (ITO) electrodes modified by a tris(2,2′-bipyridine)ruthenium(II) (Ru(bpy)2+3) derivative with two tridecanethiol groups were studied. Although the electrochemical response of the gold electrode modified by the Ru(bpy)2+3-tridecanethiol derivative was irreversible and unstable because oxidation of the gold surface and the thiolate monolayer itself started before oxidation of the Ru(bpy)2+3 head group, the modified ITO electrode showed the stable redox of Ru(bpy)2+3 head group. Both the modified gold and modified ITO electrodes showed ECL properties in solution containing C2O2−4. We also found that a monolayer of the Ru(bpy)2+3-tridecanethiol derivative on ITO acts as a mediator for the oxidation of C2O2−4 in solution. Transient responses of current and ECL intensity of ITO and gold electrodes modified with the Ru(bpy)2+3-tridecanethiol derivative were also studied to elucidate the ECL mechanism.