Second-Order Optical Nonlinearities of Substituted Stilbenes and the Related Compounds Containing a Trifluoromethyl as the Electron-Withdrawing Group
作者:Yoshio Sugiyama、Yasushi Suzuki、Shuichi Mitamura、Tatsuo Nishiyama
DOI:10.1246/bcsj.66.687
日期:1993.3
The second-order optical nonlinearities and transparencies of seventeen 4,4′-disubstituted stilbenes and ten related compounds containing a trifluoromethyl group at the para position, as the electron-withdrawing group, were examined. The introduction of a trifluoromethyl group produces a shorter-wavelength shift of the UV-vis absorption spectra without any decrease in the magnitude of the second-order
研究了 17 个 4,4'-二取代的二苯乙烯和 10 个在对位含有三氟甲基作为吸电子基团的相关化合物的二阶光学非线性和透明度。与相应的硝基衍生物相比,三氟甲基的引入会产生更短波长的紫外-可见吸收光谱,而不会降低二级分子超极化率 (β) 的大小。在 375 nm 处观察到 4-甲氧基-4'-三氟甲基二苯乙烯 (1) 的吸收截止值 (λcutoff),大约为 375 nm。比对硝基苯胺 (p-NA) (463 nm) 短 90 nm;然而,1 的 β 值 (12.2 × 10−30 esu) 几乎等于 p-NA 的 (12.6 × 10−30 esu)。在中心双键上带有氰基的溴代或甲硫基取代的芪(12 和 16)显示出 SHG 活性。SHG的相对强度分别为3.0和1.5。