1,2,3,4-四氢喹啉-4-酮衍生物的线性及非线性光学性质

合成了一系列具有刚性结构的推拉型1,2,3,4-四氢喹啉-4-酮衍生物: 1-苄基-1,2,3,4-四氢喹啉-4-酮(BTHQ)、2-(1,2,3,4-四氢喹啉-4-叶立德)丙二腈(THQM)、1,6-二羰基久洛尼定(DOJ)和1,6-二(二氰甲烯基叶立德)久洛尼定(BDCJ).测定了其吸收光谱、单光子荧光光谱和双光子上转换荧光光谱. 这类化合物的单双光子荧光参数都存在着很强的、规则的溶剂效应, 表明分子激发态可能存在较大的极性. 它们的二氯甲烷溶液在800 nm飞秒激光(150 fs)照射下, 能够发射出很强的双光子上转换荧光. 采用非线性透过率法测得四个化合物的双光子吸收截面在0.83～23.95×10－50 cm4•s•photon－1之间. 这类化合物的激发态存在有效的分子内电荷转移, 对双光子吸收和双光子荧光发射有较大贡献.

Linear and Nonlinear Optical Properties of 1,2,3,4-Tetrahydroquinolin-4-one Derivatives

A series of 4-dihydroquinolinone derivatives with planar push-pull structure were synthesized including 1-benzyl-2,3-dihydroquinolin-4-one (BDHQ), 2-(2,3-dihydroquinolin-4(1H)-ylidene)malononitrile (DHQM), 1, 6-diketojulolidine (DKJ) and 1, 6-bisdicyanomethylene julolidine (BDCJ). The absorption spectra, one-photon excited fluorescence and two-photon excited fluorescence spectra have been recorded. The derivatives show strong solvatochromism in both their one-photon and two-photon excited fluorescence, sug-gesting great polarity of their excited states. Pumped by femtosecond laser at 800 nm, strong up-conversion emissions in the solution of CH2Cl2 have been observed. Their two-photon absorption cross-sections ob-tained by nonlinear transmission method are in the range of 0.83~23.95×10-50 cm4•s•photon-1. The in-tramolecular charge state upon excited state makes the dominant contribution to the two-photon absorption and two-photon excited fluorescence of theses compounds.