The effect of lateral fluoro-substitution on the liquid crystal behaviour of some 4'-alkylphenylethyl- and trans-4'-alkylcyclohexylethyl-4,4'-disubstituted biphenyls
作者:
G.W. Gray,
D. Lacey,
J.E. Stanton,
K.J. Toyne,
期刊:
Liquid Crystals
(Taylor Available online 1986)
卷期:
Volume 1,
issue 5
页码: 407-413
ISSN:0267-8292
年代: 1986
DOI:10.1080/02678298608086265
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The preparation of several 4'-alkylphenylethyl- and trans-4'-alkylcyclohexyl-ethyl-4,4'-disubstituted biphenyls and their 2-fiuoro derivatives is described and their transition temperatures are reported. The effect on the transition temperatures caused by the replacement of a cyclohexane ring by a benzene ring and the effect of fluoro-substitution on nematic, smectic A and smectic B thermal stabilities is discussed. In these systems, and in others, when the lateral fluoro-substituent points towards the longer terminal aliphatic unit (alkyl or alkylcyclo-hexylethyl) it causes a greater depression of smectic properties.
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