Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentska 573, Pardubice 53210, Czech Republic.
J Phys Chem A. 2010 Sep 9;114(35):9440-6. doi: 10.1021/jp1047634.
We have studied photoinduced absorption, birefringence, and optical second-harmonic generation in poly(methyl methacrylate) (PMMA) films doped by organic chromophores featuring 4,5-dicyanoimidazole in the weight content equal to 5%. The chromophores indicated as IM1-IM6 were synthesized from 2-bromo-1-methylimidazole-4,5-dicarbonitrile by either nucleophilic substitution or Suzuki-Miyaura cross-coupling reaction. The samples were obtained as films of several micrometers thickness by the spin-coating method on a quartz substrate. Measurements of the optically induced birefringence were done by the Senarmont method at wavelength 1150 nm, and photoinduced absorption was studied in the spectral range 250-700 nm under optical treatment by 300 mW cw 532 nm laser. Photoinduced optical effects were studied by bicolor 1064 and 532 nm coherent laser pulses. The maximal changes were observed for the ratio between fundamental and writing beam intensities equal to about 7:1. To interpret the observed experimental measurements, theoretical simulations of photoinduced optical properties were performed by quantum chemical computational methods.
我们研究了在重量含量为 5%的有机发色团掺杂的聚甲基丙烯酸甲酯（PMMA）薄膜中的光致吸收、双折射和光二次谐波产生。所研究的发色团表示为 IM1-IM6，是由 2-溴-1-甲基咪唑-4,5-二氰基通过亲核取代或Suzuki-Miyaura 交叉偶联反应合成的。样品通过旋涂法在石英衬底上制成几微米厚的薄膜。在 1150nm 波长下通过 Senarmont 法测量光致双折射，在 250-700nm 光谱范围内通过 300mW 连续 532nm 激光光处理研究光致吸收。双色 1064nm 和 532nm 相干激光脉冲研究光致光学效应。在基频光和写入光束强度比约为 7:1 时观察到最大变化。为了解释观察到的实验测量结果，通过量子化学计算方法对光致光学性质进行了理论模拟。
