Chemical modulation of the luminescence of a DNA-bound diruthenium(II) complex by copper(II) ion and EDTA

A method for the chemical modulation of the photoluminescence of a DNA-bound diruthenium(II) complex, [(bipy) 2 Ru(bpib)Ru(bipy) 2 ] 4+ (bipy = 2,2′-bipyridine, bpib = 1,4- bis ([ 1 , 10 ]phenanthroline [5,6- d ]imidazol-2- yl ) benzene) by the introduction of Cu 2+ ion and EDTA has been developed....

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Bibliographic Details
Published in:Transition metal chemistry (Weinheim) 2010-09, Vol.35 (6), p.707-711
Main Authors: Li, Qian, Chao, Hui, Chen, Miao-Jing, Li, Hong, Xu, Zheng-He
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Organometallic Chemistry
Physical Chemistry
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Summary:A method for the chemical modulation of the photoluminescence of a DNA-bound diruthenium(II) complex, [(bipy) 2 Ru(bpib)Ru(bipy) 2 ] 4+ (bipy = 2,2′-bipyridine, bpib = 1,4- bis ([ 1 , 10 ]phenanthroline [5,6- d ]imidazol-2- yl ) benzene) by the introduction of Cu 2+ ion and EDTA has been developed. The diruthenium(II) complex showed strong photoluminescence both in buffer solutions and on an indium-tin oxide (ITO) surface, which was not modulated by Cu 2+ or EDTA. The DNA-bound [(bipy) 2 Ru(bpib)Ru(bipy) 2 ] 4+ with a binding constant of 3.8 × 10 4  M −1 showed an enhancement in the luminescence based on the electrostatic interaction between the complex and DNA. The presence of Cu 2+ was found to quench the luminescence of DNA-bound [(bipy) 2 Ru(bpib)Ru(bipy) 2 ] 4+ , but the quenched luminescence was recovered by addition of an equimolar concentration of EDTA. Hence, the photoluminescence of DNA-bound [(bipy) 2 Ru(bpib)Ru(bipy) 2 ] 4+ depends strongly on the introduction of Cu 2+ and EDTA.
ISSN:0340-4285
1572-901X
DOI:10.1007/s11243-010-9383-9