We report the synthesis and physico-chemical characterization, including molecular second order nonlinear optical properties by the EFISH technique, of three new heterocycle based push–pull chromophores. Two chromophores contain the five membered 1,3,4-oxadiazole ring, the third a thiophene ring. The chromophores also contain azo or stilbene bridges between conjugated aromatic rings and are functionalized for covalent incorporation into polymer chains. The maximum observed μgβ is 1350 × 10−48 esu for the thiophene chromophore in conditions far from resonance enhancement (fundamental laser wavelength 1.907 µm). The crystal structure of one oxadiazole chromophore is also discussed.
我们报告了三种基于杂环的推拉色素的新合成及物理
化学特性表征,这包括通过EFISH技术获得的分子二次非线性光学特性。两种色素含有五元的
1,3,4-噁二唑环,第三种则含有
噻吩环。这些色素还包含
联苯或偶氮桥接在共轭芳香环之间,并进行了功能化以便于共价结合到聚合物链中。在远离共振增强条件下(基础激光波长1.907 µm),
噻吩色素的最大观察到的μgβ为1350 × 10−48 esu。同时也讨论了一种噁二唑色素的晶体结构。