Thermotropic liquid crystals from planar chiral compounds: [2.2]Paracyclophane as a mesogen core

被引：0
|
作者：
Rozenberg, VI
Popova, EL
Hopf, H
机构：
[1] Russian Acad Sci, AN Nesmeyanov Organoelement Cpds Inst, Moscow 117813, Russia
[2] Tech Univ Carolo Wilhelmina Braunschweig, Dept Organ Chem, D-38106 Braunschweig, Germany
来源：
HELVETICA CHIMICA ACTA | 2002年 / 85卷 / 02期
关键词：
D O I：
10.1002/1522-2675(200202)85:2<431::AID-HLCA431>3.0.CO;2-H
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
New thermotropic mesomorphic compounds containing a [2.2]paracyclophane (PC) unit were synthesized and investigated (Scheme). Carboxylic acids were selected as the starting PC building blocks. The influence of structural features on the stability of the mesomorphic phases was studied (Figs. 1 and 2): for this purpose. the structures of the PC-carboxylate unit and the organic fragment of the aryl-ester moiety were varied systematically. Esters derived from PC-monocarboxylic acid did not exhibit liquid-crystalline (LC) properties, while diaryl PC-dicarboxylates favored mesomorphism. Dicarboxylate substituents arranged in the paraposition provided LC phases in a broad temperature range and considerably increased the mesomorphic interval in comparison with that of the structurally related pseudo-para PC derivatives.
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页码：431 / 441
页数：11
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