Ferroelectric Liquid Crystals with Chiral Groups on Each Side of the Core
The syntheses and properties of a series of ferroelectric liquid crystals with two chiral groups, one on each side of the core, are described.One of the chiral groups is an optically active alkanoyl group and the other is a group derived from one of three kinds of optically active carboxylic acids.The mesomorphic properties and spontaneous polarization of these chiral compounds are compared with those of monochiral compounds having one of the two chiral groups.These properties and polarization values are discussed in terms of the core and the chiral structure.Thedichiral compounds all exhibit very large spontaneous polarization and the maximum value (11.3 mC/m2)was obtained for a compound with a hydroxyl group in the core.
Kobayashi, S.,Ishibashi, S.
p. 1 - 17
(2007/10/02)
Optically active compounds and liquid crystal compositions containing such compounds
An optically active compound of the formula: STR1 wherein R is alkyl or alkoxy, R* is an optically active alkyl group, X is alkyl or halogen, Y is a single bond STR2 and C* is an asymmetric carbon, is chemically stable and shows or induces large spontaneous polarization and is useful in a chiral liquid crystal composition.
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(2008/06/13)
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