Cyanostilbene bent-core molecules: a route to functional materials
Cyanostilbene bent-core molecules: a route to functional materials
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DOI：
10.1039/c5tc00201j
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发表时间：
2015-03
影响因子：
6.4
通讯作者：
Marta Martínez‐Abadía;B. Robles-Hernández;B. Villacampa;M. R. D. L. Fuente;R. Giménez;M. Ros
中科院分区：
文献类型：
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作者：
Marta Martínez‐Abadía;B. Robles-Hernández;B. Villacampa;M. R. D. L. Fuente;R. Giménez;M. Ros
报道了新型化合物的合成和表征，这些化合物包含高电流感兴趣的功能性氰基芪单元。衍生自3，4 ′-联亚苯基的四个实例具有促进各种非晶核液晶相（柱状、极性近晶C和暗聚集相）的2D分子形状。介晶性的特点是通过光学显微镜，差示扫描量热法，X-射线衍射，并通过详细的电光和介电研究。液晶性质可以根据CC键上氰基的位置（α-或β-异构体）和分子中氰基芪单元的数量（一个或两个）来调节。极性近晶C中间相具有反铁电基态。此外，氰基芪结构的多响应性质导致了非常有吸引力和多样的光活性，包括发光和二次谐波产生。所获得的结果拓宽的可能性，使用双核液晶设计新型的多响应软材料。
The synthesis and characterization of novel compounds, that incorporate the high current interest functional cyanostilbene unit, are reported. Four examples, derived from 3,4′-biphenylene, have a 2D molecular-shape that promotes a variety of bent-core liquid crystalline phases (columnar, polar smectic C, and dark-conglomerate phases). The mesomorphism has been characterized by optical microscopy, differential scanning calorimetry, X-ray diffraction, and by detailed electrooptic and dielectric studies. The liquid crystalline properties can be modulated depending on the position of the cyano group on the CC bond (α- or β-isomers) and the number of cyanostilbene units in the molecule (one or two). The polar smectic C mesophases have an antiferroelectric ground state. Furthermore, the multiresponsive nature of the cyanostilbene structure has led to very attractive and diverse photoactivity, including luminescence and second harmonic generation. The results obtained broaden the possibilities for the use of bent-core liquid crystals to design novel multiresponsive soft materials.