4-Cyanoresorcinol-Based Bent-Core Mesogens with Azobenzene Wings: Emergence of Sterically Stabilized Polar Order in Liquid Crystalline Phases
作者:Mohammed Alaasar、Marko Prehm、Kathrin May、Alexey Eremin、Carsten Tschierske
DOI:10.1002/adfm.201302295
日期:2014.3
compounds, ranging from cybotactic nematic via paraelectric SmC phases, polarization randomized SmCsPR phases to ferroelectric and antiferroelectric SmC phases, associated with increasing size and correlation length of the polar domains. Spontaneous formation of chiral domains is observed in the paraelectric SmC and the SmCsPR phases and discussed in relation with superstructural chirality, bend elastic
合成了一系列新的含偶氮苯的弯曲核分子,这些弯曲核分子以4-氰基间苯二酚为中心核心单元,表现出等向性向列相,矩形,柱状和不同类型的倾斜近晶(SmC)相。使用各种实验技术,可以在块状和自由悬浮的薄膜中表征中间相的行为和相结构。根据链长和温度的不同,在这些化合物中观察到一系列不同的中间相,从顺向向列相到顺电SmC相,到极化随机的SmC s P R。相到铁电和反铁电SmC相,这与极性域的大小和相关长度增加有关。在顺电SmC和SmC s P R相中观察到手性域的自发形成,并讨论了与超结构手性,弯曲弹性常数和表面效应有关的问题。