A series of novel chromophores based on same bis (N,N-diethyl) aniline donor have been synthesized and systematically characterized. Chromophores with rigid steric hindrance groups showed superb thermal stabilities with high thermal decomposition temperatures above 260 °C. Besides, compared with the chromophore (y2) without isolation group, these new chromophores show better intramolecular charge-transfer absorption. Most importantly, the introduction of rigid steric hindrance groups can effectively reduce dipole–dipole interactions to translate their relatively β values into bulk large electro-optic activities. The electro-optic coefficient of poled films containing 25 wt % of these new chromophores doped in amorphous polycarbonate afforded values of 163, 129, 183 and 196 pm V⁻¹ at 1310 nm for chromophores y1-y4 respectively. These results indicated that introducing rigid isolation group to control the shape of chromophores can efficiently reduce intermolecular electrostatic interactions, thus enhancing the macroscopic electro-optic activity. These properties, together with good solubility, suggest the potential use of these chromophores as advanced material devices.

合成了一系列基于相同的双（N，N-二乙基）苯胺供体的新型生色团，并对其进行了系统表征。具有刚性位阻基团的发色团在热分解温度高于260°C时显示出极好的热稳定性。另外，与没有分离基团的发色团（y2）相比，这些新发色团显示出更好的分子内电荷转移吸收。最重要的是，引入刚性位阻基团可以有效减少偶极-偶极相互作用，从而将其相对的β值转化为大量的大型电光活动。包含25％（重量）这些新发色团的无定形聚碳酸酯中掺杂的极化膜的电光系数值为163、129、183和196 pm V ^-1对于发色团y1-y4分别在1310 nm处。这些结果表明引入刚性隔离基团来控制生色团的形状可以有效地减少分子间的静电相互作用，从而增强宏观电光活性。这些性质以及良好的溶解性表明这些生色团可以用作高级材料设备。