Development of photoluminescent liquid-crystalline dimers bearing two fluorinated tolane-based luminous mesogens
Development of photoluminescent liquid-crystalline dimers bearing two fluorinated tolane-based luminous mesogens
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DOI：
10.1016/j.molliq.2022.119884
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发表时间：
2022-07
影响因子：
6
通讯作者：
S. Yamada;Eiji Uto;Keigo Yoshida;T. Sakurai;T. Konno
中科院分区：
文献类型：
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作者：
S. Yamada;Eiji Uto;Keigo Yoshida;T. Sakurai;T. Konno
设计并合成了由不同长度的亚烷基链连接的两个氟化二苯甲烷组成的氟化二苯甲烷二聚体，通过三个反应步骤，包括芳香亲核取代和Mitsunobu型醚化反应。虽然没有观察到中间相的情况下，由相对较短的亚烷基系链连接的二聚体，氟化二苯乙炔二聚体与相对较长的系链在冷却过程中经历了一个过渡到一个非线性液晶（NLC）相。此外，氟化二苯乙炔二聚体表现出光致发光（PL），无论是在溶液中，并在结晶（Cr）相，效率高达0.72。值得注意的是，发现N相分子聚集体的PL行为不同于Cr相。这些发现为开发热响应光致发光液晶（PLLC）和PL材料的热敏应用提供了一条有前途的途径。
Fluorinated tolane dimers consisting of two fluorinated tolanes connected by various lengths of an alkylene tether were designed and synthesized via three reaction steps including an aromatic nucleophilic substitution and a Mitsunobu-type etherification reaction. Although mesophases were not observed in the case of dimers connected by relatively short alkylene tethers, fluorinated tolane dimers with relatively long tethers underwent a transition to a nematic liquid crystalline (N LC) phase during cooling. In addition, the fluorinated tolane dimers exhibited photoluminescence (PL), both in solution and in the crystalline (Cr) phase, with efficiencies of up to 0.72. It is noteworthy that the PL behavior of the N phase molecular aggregates was found to be different from that of the Cr phase. These findings suggest a promising route for the development of thermo-responsive photoluminescent liquid crystals (PLLCs) and thermosensing applications of PL materials.