The influence of the liquid crystalline core geometry on the mesogenicity of novel chiral 2-(4-substituted-phenoxy)propanonitriles
作者:
ChristopherJ. Booth,
JohnW. Goodby,
JudithP. Hardy,
OlwenC. Lettington,
KennethJ. Toyne,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 16,
issue 6
页码: 925-940
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408027864
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The synthesis and characterization of seven novel (R)-2-(4-substituted-phenoxy)propanonitriles are described. The propanonitriles were prepared to evaluate their potential use as thermochromics and ferroelectric dopants, as well as to determine their twist sense properties. The materials exhibit smectic and chiral nematic phases of high thermal stability; the mesogenic behaviour of the nitriles is directly related to the type of two-ring core unit employed. The effects of the different molecular geometries and polarizabilities of the liquid crystalline cores on mesophase stability are discussed, particularly in relation to other members of this series. The chiral nematic phase of the propanonitriles is assigned as having a left-handed twist sense from contact preparation studies, and this is in agreement with rules relating absolute configuration and molecular structure to helical twist sense.
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