Mixed ligand ruthenium(II) complexes of 5,6-dimethyl-1,10-phenanthroline: The role of ligand hydrophobicity on DNA binding of the complexes
作者:Palanisamy Uma Maheswari、Venugopal Rajendiran、Mallayan Palaniandavar、Reji Thomas、G.U. Kulkarni
DOI:10.1016/j.ica.2006.07.053
日期:2006.11
Abstract A series of mixed ligand Ru(II) complexes of 5,6-dimethyl-1,10-phenanthroline (5,6-dmp) as primary ligand and 1,10-phenanthroline (phen), 2,2′-bipyridine (bpy), pyridine (py) and NH3 as co-ligands have been prepared and characterized by X-ray crystallography, elemental analysis and 1H NMR and electronic absorption spectroscopy. The X-ray crystal structure of the complex [Ru(phen)2(bpy)]Cl2
摘要以5,6-二甲基-1,10-菲咯啉(5,6-dmp)为主要配体和1,10-菲咯啉(phen),2,2'-联吡啶的一系列混合配体Ru(II)配合物( bpy),吡啶(py)和NH3的共配体已经制备并通过X射线晶体学,元素分析,1H NMR和电子吸收光谱进行了表征。复杂的[Ru(phen)2(bpy)] Cl2的X射线晶体结构揭示了RuN6配位球的扭曲的八面体配位几何形状。从吸收光谱滴定获得的DNA结合常数按以下顺序递减:tris(5,6-dmp)Ru(II)> bis(5,6-dmp)Ru(II)> mono(5,6-dmp)Ru (II),这与复合物与DNA结合时表观发射增强的趋势一致。这些观察结果表明,复合物的DNA结合亲和力取决于5,6-dmp配体的数量,因此取决于DNA表面5,6-二甲基基团的疏水相互作用,这对于确定DNA结合亲和力和DNA亲和力至关重要。激基复合物的溶剂可及性。在双(5