Liquid crystalline properties of some compounds having a perfluoroalkyl group

被引:33
作者
Okamoto, H [1 ]
Yamada, N [1 ]
Takenaka, S [1 ]
机构
[1] Yamaguchi Univ, Dept Adv Mat Sci & Engn, Fac Engn, Ube, Yamaguchi 7558611, Japan
关键词
liquid crystals; smectic properties; substituent effect; perfluoroalkyl group;
D O I
10.1016/S0022-1139(98)00189-4
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The paper describes the liquid crystalline properties of 2-(n-perfluoroalkyl) ethyl para-, meta-, and/or ortho-substituted benzoates, and some related compounds. Most of the ortho and/or meta-substituted derivatives show a smectic B phase, while the para-substituted ones are non-mesogenic. When the substituent is a nitro or a cyano group, many derivatives show a smectic A, as well as a B phase. The corresponding 4-trans-alkylcyclohexanecarboxylates are non-mesogenic. Meta- or para-substituted phenyl omega-hydroperfluoroalkanoates are also non-mesogenic. From these results, we conclude that in order to show Liquid crystalline properties for the present systems, the substituents at meta and/or ortho positions, orientation of the ester group, and the rigid perfluoroalkyl group are very important. X-ray study indicated that the smectic A and B phases for polar liquid crystals have a partially bilayer and bilayer arrangements, respectively. The smectic B phase for non-polar liquid crystals have a monolayer arrangement. Thermal motion around the perfluoroalkyl group is assumed to be almost frozen in both phases. (C) 1998 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:125 / 132
页数:8
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