Liquid Crystals with a Thiomethyl End Group: Lateral Fluoro Substituted 4-(trans-4-(n-Propyl) Cyclohexylethyl-4′-Thiomethylbiphenyls and 4-n-Alkyl-4″-Thiomethylterphenyls
作者:
Mark Goulding,
Simon Greenfield,
Owain Parri,
David Coates,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 265,
issue 1
页码: 27-40
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508041675
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The synthesis and mesogenic properties of some lateral fluoro substituted 4-(trans-4-(n-propyl)cyclohexylethyl)-4′-thiomethylbiphenyls and 4-n-alkyl-4″-thiomethylterphenyls are described. Birefringence (Δn) and dielectric anisotropy (Δϵ) measurements for these compounds are also given and compared with analogous terminal chloro, cyano and methoxy compounds. It is found that the use of a terminal thiomethyl group produces compounds of intermediate Δn, Δϵ and clearing point than analogous terminal chloro, methoxy and cyano compounds. The terminal thiomethyl group is also more smectogenic than any of the other three terminal endgroups. In most cases, however, the melting points of the compounds are too high to be of practical use.
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