D-π-A 星型分子的合成及非线性光学性质

摘要

以苯基为中心，通过 Suzuki 偶联反应引入两个电子给体（D）单元三苯胺和电子受体（A）单元菲并咪唑，合成了新的 D-π-A 星型分子（Y），其结构通过 NMR、ESI-MS 及元素分析进行了表征；通过紫外可见吸收光谱、荧光光谱、荧光量子产率、理论计算以及 Z 扫描测试技术对该分子的三阶非线性光学性质进行了研究。结果表明，分子Y的荧光量子产率(ϕ)可达0.77，双光子吸收截面(σ2)为120GM，三阶非线性折射率（n2）为9.0×10−7cm2/GW，可见该化合物具有较好的非线性光学性质，为非线性光学材料的分子设计提供了一定的思路。%With phenyl as the center,a new D-π-A star-shaped molecule (Y) was designed and synthesized by introducing two electron-donors,(D) unit triphenylamine and electron-accepting (A) unit phenanthroimidazole with Suzuki coupling,and its structure has been characterized by NMR, ESI-MS and elemental analysis. The third order nonlinear optical properties of the compound Y has been studied systematically through UV-Vis absorption spectroscopy,fluorescence spectroscopy,the fluorescence quantum yield,theoretical calculation and Z-scan technology. The results showed that the fluorescence quantum yield (ϕ) is up to 0.77,the two-photon absorption cross section (σ2) is 120GM, and the third order nonlinear refractive index (n2) is 9.0×10−7cm2/GW,which provides a new idea for the design of molecular with good nonlinear optical properties.