Study of transient luminescence of three kinds of Ru complexes bound to DNA  

作　　者：ZHU WeiLing LIU XueWen WANG Hui YU HuiJuan LI AiZheng CHAO Hui ZHENG KangCheng JI LiangNian 

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies,Sun Yat-sen University,Guangzhou 510275,China [2]College of Chemistry and Chemical Engineering,Sun Yat-sen University,Guangzhou 510275,China [3]Department of Technical Physics,Maoming College,Maoming 525000,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2008年第2期133-139,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：the National Natural Science Foundation of China (Grant Nos. 60478013 and 20571089);The Key Program of Natural Science Foundation of Guangdong Province of China (Grant No. 05101819);the Doctoral Program Foundation of Institutions of Higher Education of China (Grant No. 20040558031);the Scientific Research Foundation of Maoming College (Grant No. 203346)

摘　　要：The transient luminescence of three kinds of ruthenium complexes [Ru(bpy)2(7-CH3-dppz)]2+, [Ru(bpy)2(7-F-dppz)]2+ and [Ru(phen)2(7-F-dppz)]2+ bound to calf thy-mus DNA (ctDNA) has been studied by using the time-resolved spectroscopy. The results show that the luminescence is due to the radiative decay from the charge-transfer states to the ground state. By the interaction with DNA, the radia-tiveless rate of the photoexcited Ru complex molecules decreases, which results in the increase of luminescence lifetime and efficiency. The structure of the Ru com-plex has an important impact on the interaction with DNA. The [Ru(bpy)2(7-CH3-dppz)]2+ shows the longest luminescence lifetime (about 382 ns), while the [Ru(bpy)2(7-F-dppz)]2+ shows the shortest lifetime (about 65 ns). The possible origin of the luminescence dynamics is discussed.The transient luminescence of three kinds of ruthenium complexes [Ru(bpy)2(7-CH3-dppz)]2+, [Ru(bpy)2(7-F-dppz)]2+ and [Ru(phen)2(7-F-dppz)]2+ bound to calf thymus DNA (ctDNA) has been studied by using the time-resolved spectroscopy. The results show that the luminescence is due to the radiative decay from the charge-transfer states to the ground state. By the interaction with DNA, the radiativeless rate of the photoexcited Ru complex molecules decreases, which results in the increase of luminescence lifetime and efficiency. The structure of the Ru complex has an important impact on the interaction with DNA. The [Ru(bpy)2(7-CH3-dppz)]2+ shows the longest luminescence lifetime (about 382 ns), while the [Ru(bpy)2(7-F-dppz)]2+ shows the shortest lifetime (about 65 ns). The possible origin of the luminescence dynamics is discussed.

关 键 词：ULTRAFAST photoelectronics TRANSIENT LUMINESCENCE DNA and Ru complex ULTRAFAST SPECTROSCOPIC technology 

分 类 号：Q523[生物学—生物化学]