Study of the nonlinear optical properties of ruthenium(Ⅱ) complexes

We report the spectroscopic study and nonlinear optical properties for a series of novel mixed ligand [Ru(bpy)2L]2+ complexes.Herebpy=2,2-bipyridine,Lisimidazo[f]1,10 phenanthroline(IP)-2-phenylimidazo1,10-phenanthroline(PIP) and the derivatives and their complexes [Ru(bpy)2L]2+.The effects of different electron donor and acceptor groups on the absorption and emission spectra are studied with nanosecond resolution.Time resolved luminescence studies reveal that the addition of calf thymus DNA into the complex solution results in increases both the emissive intensities and excited state lifetimes and indicates that the electron group on L has no significant effect on the intercalation binding mode between DNA and the complexes.The nonlinear optical of ruthenium complexes with good charge transfer properties were studied by degenerate four wave mixing(DFWM) at 450nm.The third order nonlinear optical susceptibilities and the third order hyperpolarizabilities of molecules,and the in fluence on the nonlineal optical coefficents of compounds were discussed.