Ruthenium(II) mixed-ligand complexes containing 2-(6-methyl-3-chromonyl)imidazo[4,5-f][1,10]-phenanthroline: Synthesis, DNA-binding and photocleavage studies
                                
                                    
                                        作者:Yun-Jun Liu、Hui Chao、Yi-Xian Yuan、Hui-Juan Yu、Liang-Nian Ji                                    
                                    
                                        DOI:10.1016/j.ica.2006.05.015
                                    
                                    
                                        日期:2006.9
                                    
                                    Two novel Ru(II) complexes [Ru(bpy),(MCMIP)](2+) (1) and [Ru(phen)(2)(MCMIP)](2+) (2) (bpy = 2,2'-bipyridine; phen = 1, 10-phenanthroline; MCMIP = 2-(6-methyl-3-chromonyl)imidazo[4,5-f][1,10]-phenanthroline) have been synthesized and characterized by elemental analysis, mass spectra and H-1 NMR. The DNA-binding properties of the complexes were investigated by absorption, emission, melting temperature and viscosity measurements. Experimental results indicate that the two complexes can intercalate into DNA base pairs. Upon irradiation at 365 nm, two Ru(11) complexes were found to promote the cleavage of plasmid pBR 322 DNA from super-coiled form I to nicked form II, and the mechanisms for DNA cleavage by the complexes were also investigated. (c) 2006 Elsevier B.V. All rights reserved.