119464-94-7Relevant academic research and scientific papers
67. Ferroelectric Liquid Crystals. Laterally Substituted Phenyl Benzoates Incorporating a trans-1,4-Disubstituted Cyclohexane Ring.
Kelly, Stephen M.
, p. 594 - 607 (2007/10/02)
About 65 diverse phenyl benzoates incorporating a trans-1,4-disubstituted cyclohexane ring and at least one lateral substituent have been synthesised.The dependence of the liquid-crystal transition temperatures of these materials on various lateral substituents (F, Cl, CN, and Br) in different positions of the esters has been investigated systematically.The influence of up to four F-atoms in various positions of a standard ester has been thoroughly studied and the optimum combination for a broad smectic C mesomorphic range established.In consequence, three homologous series incorporating the 4-alkoxy-2,3-difluorobenzoic-acid moiety were prepared.An additional C=C bond was introduced into the alkyl chain attached to the cyclohexane ring of some of these esters and the resulting modifications of the transition temperatures determined.Three ester series incorporating a lateral substituent and the optically active (+)-(S)-(1-methylphenyl)oxy substituent have also been synthesised, and similar effects have been observed.These materials can be used as important components of commercial chiral smectic C mixtures for electro-optic display device applications.
Synthesis and Liquid Crystalline Properties of 1-(trans-4-Alkylcyclohexylethyl)-4-Alkyl- and -4-Alkoxy-Benzenes, Their Ketone Precursors, and Some Lateral Fluoro-Derivatives
Gray, George W.,Lacey, David,Scrowston, Richard M.,Shenouda, Ibrahim G.,Toyne, Kenneth J.
, p. 101 - 116 (2007/10/02)
The preparation of some 1-(trans-4-alkylcyclohexylethyl)-4-alkyl- and -4-alkoxy-benzenes, their methylenecarbonyl linked analogues and their laterally fluoro- and bromo-substituted derivatives is reported.Twenty-four inter-related compounds have been prepared and the trends in their transition temperatures are discussed.Both the melting points and clearing points for these compounds are relatively low and, in general, SB and SA phases predominate.The suitability of these compounds as additives to SC materials has been assessed using two SC hosts.Keywords: Mesogenic cyclohexylethanes, mesogenic ketones, fuoro-substitution of mesogens
