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

• 来源期刊: 中国科学G辑（英文版）
• 年，卷（期）: 2008,（2）
• 页码范围: 133-139
• 页数: 7页
• 语种: 英文
• DOI: 10.1007/s 11433-007-0080-4

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 radla-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.