Novel liquid crystals with a bent molecular shape containing a 1,5-disubstituted 2,3,4-trifluorophenyl unit. Banana-shaped liquid crystals - synthesis and properties
Novel liquid crystals with a bent molecular shape containing a 1,5-disubstituted 2,3,4-trifluorophenyl unit. Banana-shaped liquid crystals - synthesis and properties
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DOI：
10.1039/b102988f
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发表时间：
2001-01-01
影响因子：
--
通讯作者：
Toyne, KJ
中科院分区：
文献类型：
--
作者：
Hird, M;Goodby, JW;Toyne, KJ
本文以香蕉型液晶为研究对象，详细介绍了一系列具有弯曲分子形状的新型非手性和外消旋液晶的合成、相变温度和手性性质，这些液晶含有1，5-二取代的2，3，4-三氟苯基结构。这项工作代表了一个推测性的延伸研究铁电主体材料具有高介电双轴性，并讨论了一些有趣的结果。值得注意的是，一些非手性材料产生柱状中间相，其中分子在柱内倾斜，允许手性的产生，其他非手性材料以近晶C相的形式表现出“常规”介晶性，但产生相等数量的相反手性区域。外消旋材料产生未鉴定的近晶相，尽管具有外消旋性质，但其表现出单手性的手性性质。
The synthesis, transition temperatures and chiral properties of a range of novel achiral and racemic liquid crystals with a bent molecular shape containing a 1,5-disubstituted 2,3,4-trifluorophenyl moiety are detailed in the context of the recently popular research topic of banana-shaped liquid crystals. The work represents a speculative extension of research into ferroelectric host materials with high dielectric biaxiality, and some interesting results are discussed. Notably, some achiral materials generate a columnar mesophase where the molecules are tilted within the columns, allowing the generation of chirality, other achiral materials exhibit a 'conventional' mesomorphism in the form of a smectic C phase, but an equal number of oppositely handed regions are generated. A racemic material generates an unidentified smectic phase, which exhibits chiral properties of single handedness despite the racemic nature.