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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Synthesis of novel nonlinear optical chromophores: achieving excellent electro-optic activity by introducing benzene derivative isolation groups into the bridge
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Synthesis of novel nonlinear optical chromophores: achieving excellent electro-optic activity by introducing benzene derivative isolation groups into the bridge

机译：新型非线性光学发色团的合成：通过将苯衍生物隔离基团引入桥中来实现出色的电光活性

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摘要

Three novel second order nonlinear optical (NLO) chromophores based on julolidinyl donors and tricyanofuran (TCF) acceptors linked together via modified polyene p-conjugation with rigid benzene derivative steric hindrance groups (chromophore CL1 and CL2) or unmodified polyene p-conjugation (chromophores CL) moieties as the bridges have been synthesized in good overall yields and systematically characterized. Density functional theory (DFT) was used to calculate the HOMO-LUMO energy gaps and first-order hyperpolarizability (beta) of these chromophores. Besides, to determine the redox properties of these chromophores, cyclic voltammetry (CV) experiments were performed. Compared with CL, after introducing benzene derivative steric hindrance groups into the bridge, chromophores CL1 and CL2 had good thermal stabilities with high thermal decomposition temperatures which were 32 degrees C and 24 degrees C higher than chromophore CL, respectively. Most importantly, the introduction of rigid steric hindrance groups can effectively reduce dipole-dipole interactions to translate their relatively small b values into bulk high EO activities. By doping chromophores CL, CL1 and CL2 with a high loading of 45 wt% in APC, EO coefficients (r(33)) of up to 121, 197 and 202 pm V-1 at 1310 nm can be achieved, respectively. The r(33) values of new chromophores CL1 and CL2 were about 1.6 times of chromophore CL. The high r(33) value, good thermal stability and high yield suggest the potential use of the new chromophores in an nonlinear optical area.
机译：三个基于三氯呋喃基供体和三氰呋喃（TCF）受体的新型二阶非线性光学（NLO）发色团，它们通过带有刚性苯衍生物空间位阻基团（发色团CL1和CL2）或未修饰的多烯p共轭的修饰多烯p-共轭连接在一起（发色团CL ）部分作为桥已经以良好的总产率合成并系统地表征。密度泛函理论（DFT）用于计算这些生色团的HOMO-LUMO能隙和一阶超极化率（beta）。此外，为了确定这些生色团的氧化还原性质，进行了循环伏安法（CV）实验。与CL相比，发色团CL1和CL2在桥中引入苯衍生物的位阻基团后，具有良好的热稳定性，并且具有较高的热分解温度，分别比发色团CL高32摄氏度和24摄氏度。最重要的是，引入刚性位阻基团可以有效降低偶极-偶极相互作用，从而将其相对较小的b值转化为大量的高EO活性。通过在APC中以45 wt％的高负载掺杂发色团CL，CL1和CL2，可以分别在1310 nm处获得高达121、197和202 pm V-1的EO系数（r（33））。新发色团CL1和CL2的r（33）值约为发色团CL的1.6倍。较高的r（33）值，良好的热稳定性和高产率表明，新发色团在非线性光学领域的潜在用途。

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