Synthesis and Physical Properties of Novel Terphenyl Type Ferroelectric Liquid Crystals
摘要:
A new series of optically active compounds have been prepared using 4.4 ''-terphenyldicarboxylic acid and S-2-alcoxypropanols-1. These ace Sm*C, SmA and N* chemically stable - especially with regard to racemization and UV-light compounds with a snail P-S value, high twisting power and left handedness of helix.
Ferroelectric liquid crystals (FLC’s) having various cores were synthesized and the effect of the different core structures on the spontaneous polarization (Ps) values was investigated. The results indicate that the core structure has a great influence on the Ps value and introduction of a heterocycles such as pyrimidine and thiadiazole ring in the core increases the Ps value. Moreover, several compounds in this series are interesting as chiral dopants for FLC, because the mixtures containing them showed superior properties as FLC mixture.
Optically active compounds having a plurality of asymmetric carbon atoms
申请人:CHISSO CORPORATION
公开号:EP0281424A1
公开(公告)日:1988-09-07
Optically active compounds for use in chiral liquid crystal compositions have the formula:
in which R¹ is a straight or branched alkyl, alkoxy, alkanoyl, alkanoyloxy, alkoxycarbonyl or alkoxycarbonyloxy group each containing up to 15 carbon atoms, a hydrogen or halogen atom or a cyano group;
R² is an optically active group having from 2 to 20 skeletal atoms in its chain;
(wherein X is hydrogen or halogen atom or a cyano group):
ℓ is an integer of from 1 to 10;
m is o or 1;
and * indicates an asymmetric carbon atom.
2,5-Diphenyl pyrimidine compounds and liquid crystal compositions containing them
申请人:Chisso Corporation
公开号:EP0313284A2
公开(公告)日:1989-04-26
Optically active 2,5-diphenyl pyrimide compounds, for use in liquid crystal composition have the formula:
in which R¹ is a C₁-C₂₀ alkoxy group; R² is an alkyl, acyl or alkoxyacyl group containing up to 20 carbon atoms;
and * indicates an asymmetric carbon atom.