[Ru(bpy)_2tpphz]~(2+)与Zn~(2+)形成的双核配合物的荧光性质研究

近年来,钌多吡啶配合物与DNA的作用得到了比较广泛的研究,并且发展了一系列具有特定功能的钌配合物犤1犦。如传统的DNA分子光开关犤Ru(bpy)2dppz犦2+和犤Ru(phen)2dppz犦2+犤2,3犦(bpy=2,2'-联吡啶,phen=1,10-菲咯啉,dppz=二吡啶犤3,2-a:2',3'-c犦吩嗪)。这些配合物与DNA具有较强的结合力,在水溶液中几乎不发光,但在DNA存在下则有强烈荧光发出。这是由于配合物插入DNA的碱基对之后,保护了dppz的吡嗪环上的N原子,使其免受水分子的进攻从而导致配合物荧光的恢复。但是对于大多数的多吡啶钌配合物来讲,由于其自身较强的背景荧光或与DN…

Studies on the Luminescence Properties of Heterobimetallic Complex Formed by [Ru(bpy)_2tpphz]~(2+)and Zn~(2+)

The formation of heterobimetallic ruthenium?complex was investigated by absorption and emission spectra. As an intercalator of DNA, the luminescent monometallic ruthenium?complex Ru(bpy)2tpphz]2+could coordinate with Zn2+to form the nonluminescent heterobimetallic complex Ru(bpy)2(tpphz)Zn]4+. The emission intensity of complex decreased as increasing the amounts of Zn2+and the luminescence was almost lost at the ratio of / of 1. After binding to DNA, the peripheral coordination site on the tpphz ligand remained accessible for Zn2+, the coordination occurred from the oppsite side of helix with respect to intercalated Ru(bpy)2tpphz]2+and the nonluminescent heterobimetallic complex was formed. On the other hand, the Ru(bpy)2(tpphz)Zn]4+also bound to DNA by intercalation and situated the region of the intercalated Ru(bpy)2tpphz]2+between the base pairs of DNA. The complex looked like a molecular nut (the Zn2+) and bolt (the Ru(bpy)2tpphz]2+).