In this paper, Janus molecules J1 and J2, based on the second-order nonlinear optical (NLO) chromophore of FTC (Fang's thermally stable chromophore), were designed and synthesized, in which the arrangement of chromophore moieties was different on the two sides of the core. Especially, in J2, each FTC piece had similar direction and a more similar spherical structure realized. Janus molecule J2 exhibited good thermal stability and excellent nonlinear optical performance. Thanks to the unique molecular topology, an ultrahigh d₃₃ value of 529 pm V⁻¹ at the wavelength of 1950 nm has been achieved, with 80% of its value retained at the high temperature of 161 °C. Coupled with the good thermal stability and very simple structure, the obtained results are valuable for the further development of NLO materials.

中文翻译：

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Janus分子：较大的二阶非线性光学性能，良好的时间稳定性，出色的热稳定性和具有优化的树枝状分子结构的球形结构†

本文基于FTC（Fang的热稳定发色团）的二阶非线性光学发色团，设计并合成了Janus分子J1和J2，其中发色团部分的排列不同核心。特别是，在J2中，每个FTC零件都具有相似的方向和更相似的球形结构。Janus分子J2表现出良好的热稳定性和出色的非线性光学性能。得益于独特的分子拓扑结构，d ₃₃的超高值为529 pm V ^-1在161°C的高温下，其1950 nm的波长已获得80％的保留值。加上良好的热稳定性和非常简单的结构，所获得的结果对于NLO材料的进一步开发具有宝贵的价值。