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DNA-promoted electrochemical assembly of [Ru(bpy)2IP] at an ITO electrode |
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| Authors: | Hong Li Zheng-He Xu Jian-Zhong Wu Zhong-Hua Lin |
| Affiliation: | a Department of Chemistry, South China Normal University, Guangzhou 510631, China b Department of Chemistry, Wuhan University, Wuhan 430072, China c Department of Chemistry, Zhongshan University, Guangzhou 510275, China d State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, PR China |
| Abstract: | A controllable assembly technique of Ru(bpy)2IP]3+/2+ (where bpy = 2,2′-bipyridine and IP = imidazo4,5,f]1,10]phenanthroline) promoted by calf thymus DNA at an ITO electrode is proposed. The stable assembled layer containing Ru(bpy)2IP]3+/2+ and double stranded DNA is obtained on the ITO electrode using repetitive voltammetric sweeping, confirmed by ex situ voltammetry, X-ray photoelectron spectroscopy (XPS) and the inverted fluorescence microscopy. There exist two pairs of diffusion-controlled waves and two pairs of prewaves for Ru(bpy)2IP]2+ in the voltammetric sweeping process. The half-wave potentials of the prewaves are far more negative than those of the diffusion-controlled waves. These experimental results suggest that double stranded DNA is enable to accelerate and increase the controllable assembly of Ru(bpy)2IP]3+/2+ by using the ITO surface. The fluorescence microscopy imaging reveals that Ru(bpy)2IP]3+/2+ has the ability to bind with double strand DNA. The fluorescence intensity of Ru(bpy)2IP]3+/2+ with DNA is stronger than that without DNA. |
| Keywords: | Polypyridyl ruthenium(II) complex DNA Assembly ITO Electrochemistry |
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