Luminescence properties of a di-ruthenium(II) complex with an intramolecular hydrogen bond modulated by DNA and copper(II) ion |
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| Authors: | Pei-Liang Chen Hui Chao Juan Xu Li Wang Hong Li |
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| Institution: | (1) Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment, South China Normal University, 510006 Guangzhou, People’s Republic of China;(2) Department of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, People’s Republic of China; |
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| Abstract: | Modulation of the luminescence properties of a di-ruthenium(II) complex (bpy)2Ru(BL)Ru(bpy)2]4+ (bpy = 2,2′-bipyridine, BL = 2-hydroxyl-5-methyl-1,3-bis(1,10]phenanthroline-5,6-d]imidazol-2-yl)benzene) by DNA and/or
Cu2+ ion has been investigated. It is found that the ruthenium(II) complex can coordinate to the Cu2+ ion in both the absence and presence of DNA. Binding to DNA is through electrostatic interactions and the intramolecular
hydrogen bond in the complex is located outside of the DNA. The binding constant is 1.6 × 104 M−1. Moreover, it is demonstrated that DNA has the ability to enhance the luminescence intensities of both the di-ruthenium(II)
complex and the tri-metallic system generated by chelating with Cu2+. Conversely, Cu2+ ion can quench the luminescence of both the free ruthenium(II) complex and the DNA-bound ruthenium(II) complex. |
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