A chiral induced ferroelectric liquid crystal phase transition with a vanishingly small enthalpy
A chiral induced ferroelectric liquid crystal phase transition with a vanishingly small enthalpy
复制标题
手性诱导的铁电液晶相变，具有极小的焓
DOI：
10.1080/02678298808086581
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发表时间：
1988
期刊：
影响因子：
2.2
通讯作者：
E. Chin
中科院分区：
文献类型：
--
作者：
J. Goodby;E. Chin
摘要 关于导致各种铁电液晶中间相稳定的分子相互作用的信息对于实现它们在各种光学器件中的潜在用途非常重要。因此，了解光学活性和光学纯度在各种近晶相的形成和性质中所起的作用特别令人感兴趣。为了研究这种关系，制备了三种新的液晶材料，一种为外消旋混合物，另两种为光学活性类似物。光学活性异构体似乎表现出与外消旋体不同的中间相形态。与外消旋混合物相比，手性化合物显然具有两个额外的铁电中间相。进出这些相的转变具有极小的焓。尝试根据手性铁电相中的不同偶极耦合来解释手性化合物的结果。在外消旋混合物中...
Abstract Information on molecular interactions that give rise to the stabilization of various ferroelectric, liquid-crystalline mesophases is important to the realization of their potential utility in a wide variety of optical devices. Understanding the roles that optical activity and optical purity play in the formation and properties of the various smectic phases is therefore of particular interest. In order to study this relationship three new liquid-crystalline materials were prepared, one as a racemic mixture, the other two as the optically active analogues. The optically active isomers appear to exhibit a different mesophase morphology from the racemate. The chiral compounds apparently possess two extra ferroelectric mesophases in comparison to the racemic mixture. The transitions to and from these phases have extremely small enthalpies. An attempt is made to explain the results for the chiral compounds in terms of differing dipolar couplings in the chiral ferroelectric phases. In the racemic mixtur...