Mediated oxidation of guanine by [Ru(bpy)2dpp] and their electrochemical assembly on the ITO electrode |
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Authors: | Wei Hong Su Yao Feng Sun Zhenghe Xu |
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Affiliation: | 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, PR China |
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Abstract: | Electrochemical oxidation of guanine mediated by Ru(bpy)2dpp]2+ (where bpy = 2,2′-bipyridine, dpp = 2,3-bis (2-pyridyl) pyrazine) and their electrochemical assembly at an ITO electrode prompted by guanine have been investigated with cyclic voltammetry and differential pulse voltammetry. It is found that Ru(bpy)2dpp]2+ can serve as an excellent mediator to induce the oxidation of guanine, and the mediated peak currents increase linearly with the rise of guanine concentration in the range from 0.01 to 0.20 mmol L−1. Interestingly, with the increase of repetitive voltammetric sweeping numbers, Ru(bpy)2dpp]3+/2+ can be assembled onto the ITO electrode and guanine has the ability to enhance the peak currents of prewaves. Also, with the rise of guanine concentration from 0.01 to 0.15 mmol L−1, the peak currents of prewaves increase gradually. Meanwhile, the mediated mechanism of guanine oxidation by Ru(bpy)2dpp]2+ and the assembled process of Ru(bpy)2dpp]3+/2+ on the ITO surface in the presence of guanine are discussed in detail. |
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Keywords: | Polypyridyl ruthenium(II) complex Guanine ITO Oxidation Assembly |
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