摘要：Two structurally related polypyridyl ligands ODHIP(3,4-dihydroxyl-imidazophenanthroline), MDHIP(2,4-dihydroxyl-imidazo phenanthroline) and their ruthenium(II) complexes [Ru(phen) 2ODHIP] 2+ and [Ru(phen) 2MDHIP] 2+ were prepared and characterized. Their DNA-binding properties were studied by spectroscopic methods and viscosity measurements. The results indicated that the two complexes are bound to DNA by different modes due to the different planarities of ligands. For the complex [Ru(phen) 2MDHIP] 2+, the 2- position ortho group of MDHIP could form an intramolecular hydrogen bond with the nitrogen atom of the imidazole ring to extend the planarity and strengthen the binding affinity. On the other hand, the 4- position ortho group hindered the complex from intercalating into the base pairs of DNA, and finally, making the complex bind to DNA by a partial intercalative mode. However, for the complex [Ru(phen) 2ODHIP] 2+, there was no intramolecular hydrogen bond formed and the two ortho groups further increased the steric effect and decreased the binding affinity, thus making the complex bind to DNA by groove binding mode.

摘要：应用循环伏安法、微分脉冲伏安法、电子吸收光谱和溴化乙锭 (EB)荧光分析法研究了[Cu(phen) (H2 O) (L Leu) + ](phen=1 ,1 0 邻菲咯啉 ,L Leu =L 亮氨酸 )与小牛胸腺DNA的相互作用。结果发现中心铜离子在循环伏安图上呈现一对明显的准可逆氧化还原波。当加入一定量的DNA时 ,配合物的氧化还原峰电流明显降低 ,配位阳离子的扩散系数减小 ,电子光谱的最大吸收峰明显红移 ,产生明显的减色效应。同时 ,配合物也能较大程度地猝灭EB DNA体系的荧光 ,证明配合物与DNA存在插入结合。

摘要：设计合成一个铁(Ⅱ)配合物[Fe(LA)2Br2](LA=鹅掌楸碱),以ct-DNA为靶点,通过紫外-可见光谱、荧光光谱和DNA粘度实验研究了配合物与ct-DNA的键合方式。研究表明所合成的配合物与DNA之间存在插入作用和静电作用。