DNA-promoted electrochemical assembly of [Ru(bpy)2dpp] on the ITO electrode by introducing copper(II) ion |
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Authors: | Su Yao Qingyu Guo Liangnian Ji |
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Affiliation: | a School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China b Department of Chemistry, Zhongshan University, Guangzhou 510275, PR China |
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Abstract: | The electrochemical assembly of Ru(bpy)2dpp]3+/2+ (where bpy = 2,2′-bipyridine, dpp = 2,3-bis (2-pyridyl) pyrazine) promoted by calf thymus DNA on an ITO electrode based on the introduction of copper(II) ion has been investigated. There exists a diffusion-controlled wave and two prewaves for the complex in the differential pulse voltammetric sweeping process. The formal potential of the high prewave shift ca. 0.530 V negatively compared with that of the diffusion-controlled wave. Dpp ligand with two vacant chelating N sites in the complex can bite Cu2+ and the resultant heterometallic complex shows a weakened assembly in contrast to that of Ru(bpy)2dpp]3+/2+ alone. Furthermore, double stranded DNA is able to accelerate the assembly of the ruthenium complex and heterometallic complex generated by chelating with Cu2+ by using the ITO surface, the prompted strength of the latter is far stronger than the former. Their assembled mechanism enhanced by DNA is proposed. |
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Keywords: | Polypyridyl ruthenium(II) complex DNA Assembly ITO Electrochemistry |
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