Study of the nonlinear optical properties of ruthenium(Ⅱ) complexes
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摘要: 报导对一组[Ru(bpy)2L]2+络合物的光谱特性和非线性光学性质的研究。其中bpy=2,2-bipirdine,l=imidazo[f]1.10-phenanthroline(IP),or2-pheny-limidazo[f]1,10-phenanthline (PIP)or PIP的衍生物。采用时间分辨的ns激光对这组Ru络合物在含水溶液中和与DNA结合的发光特性进行研究。实验结果表明,当在L上结合不同电子施主或受主基时,对[Ru(bpy)2L]2+的MLCT的发光强度和寿命都有很大的影响,同样DNA的插入也对此有影响。采用四波混频方法对其非线性光学特性进行了测量,由此推算出三阶极化系数和分子的三阶超极化系数。并讨论了不同配体对三阶非线性光学系数的影响。Abstract: 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.
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