理论运用密度泛函(DFT)方法,计算四个取代基型钌(II)多吡啶配合物[Ru(phen)2(6-R—dppz)]^2+(R—OH,-NO2)和[Ru(phen)2(7-R—dppz)]^2+(R=-F,-CH3).合理解释了在主配体(dppz)上引入强拉电子的取代基(-F,-NO2),比引入推电子取代基(-OH,-CH3)有利于提高配合物与DNA键合的能力.这是通过降低最低空轨道LUMO及相近的最低空轨道(LUMO+X)的能量及其插入配体的布居调控的.
Theoretical studies on the four Ru (II) polypyridyl-type complexes as [Ru (phen)2 (6-R- dppz)]^2+ (R=-OH,-NOz) and [Ru(phen)2 (7-R-dppz)]^2+(R=-F, -CH3 ) have been carried out using the Density Function Theory (DFT). Some strong electron-withdrawing substituents (-F, -NOz) introduced into the intercalative ligand (dppz) is sure much more advantageous to the interaction between the complex and DNA than some electron-pushing substituents (-OH, -CH3). This could be explained by the decrease of energies of the LUMO and/or the nearby unoccupied orbitals (LUMO+X) and their populations on the intercalative ligand.