DNA-enhanced assembly of [Ru(bpy)2ITATP] on an ITO electrode |
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Authors: | Hong Li Yun-Jun Liu Juan Xu Liang-Nian Ji Hong-Yu Chen |
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Affiliation: | a School of Chemistry and Environment, South China Normal University, Guangzhou 510631, PR China b School of Chemistry & Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China c Department of pharmacy, Guangdong College of Pharmacy, Guangzhou 510240, PR China |
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Abstract: | A novel technique for controllable assembly of [Ru(bpy)2ITATP]3+/2+ (where bpy = 2,2′-bipyridine, ITATP = isatino[1,2-b]-1,4,8,9-tetraazatriphenylene) on an ITO electrode in the absence and presence of calf thymus DNA is proposed. The [Ru(bpy)2ITATP]3+/2+ and double stranded DNA is assembled onto the ITO electrode using repetitive voltammetric sweeping. The assembly is confirmed by ex situ cyclic voltammetry and the fluorescence microscopy. A pair of diffusion-controlled waves and prewaves for [Ru(bpy)2ITATP]3+/2+ is observed in the voltammetric sweeping process. The formal potential of the prewaves is found to be much negative than that of the diffusion-controlled waves. The controllable assembly of [Ru(bpy)2ITATP]3+/2+ on the ITO surface is accelerated by DNA and affected by ionic strength. With this DNA-prompted electrochemical technique, a multifunctional biomolecular film containing surface-confined redox center of controllable thickness is fabricated. |
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Keywords: | Polypyridyl ruthenium(II) complex DNA Assembly ITO Electrochemistry |
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