噻唑类生色分子的电子光谱和非线性光学性质

Electronic Spectra and Nonlinear Optical Properties of Thiazole Chromophores

在B3LYP/6-31+G*水平上对八种噻唑类生色分子的电子光谱与二阶非线性光学性质β进行计算研究.结果表明,含羟乙基、烷氧乙基、氟乙基和氨乙基活性基团的噻唑类分子具有大的β值,为1.6×10-28esu左右,与实验结果基本一致.气相中的最大吸收波长λmax位于480-488nm范围内.含羟乙基活性基团的噻唑分子,随溶剂极性增大,λmax有红移趋势.

Electronic spectra and second-order nonlinear optical （NLO） properties of eight thiazole chromophores were calculated by density functional theory （DFT） at B3LYP/6-31＋G^＊ level. Results showed that thiazole chromophore molecules with active hydroxy-ethyl, alkoxy-ethyl, fluoro-ethyl, and amino-ethyl groups have high β values of about 1.6×10^28 esu which are in good agreement with the available experimental results. Maximum absorption wavelengths λmax of the compounds in the gas phase ranged from 480 to 488 nm. The λmax was red-shifted as the solvent polarity increased for the thiazole chromophore molecules with an active hydroxy-ethyl group.