DISCOTIC COMPOUNDS FOR USE IN LIQUID CRYSTAL MIXTURES

摘要

PCT No. PCT/GB93/01291 Sec. 371 Date Feb. 28, 1996 Sec. 102(e) Date Feb. 28, 1996 PCT Filed Jun. 16, 1993 PCT Pub. No. WO94/29263 PCT Pub. Date Dec. 22, 1994 (I) (II) Liquid crystal compounds have been synthesized of general formula (I) and may be mixed with other liquid crystal compounds to give useful liquid crystal mixtures which may then be used in liquid crystal devices. Such devices include linear and non-linear electrical, optical and electro-optical devices, magneto-optical devices and devices providing responses to stimuli such as temperature changes and total or partial pressure changes. Formula (I) where each Z1-6 is given by formula (II), where Y for each of Z1-6 is independently COO, OCO, CH2O and OCH2, m defines the number of substituents on each of Z1-6 and is independently 0-5,and X is independently for each substituent on each of Z1-6 alkyl (straight chain, branched and chiral), alkoxy (straight chain, branched or chiral), alkanoyl (straight chain, branched or chiral), alkenyl (straight chain, branched or chiral), halogen, halogenoalkyl (straight chain, branched or chiral) and CN, provided that at least one of Z-61 has at least one substituent X, and excluding where m is 1 for each of Z1-6, Y is COO for each of Z1-6 and X is n-alkyl or n-alkoxy positioned para to Y for each of Z1-6 and also where M is 5 for each of Z1-6, Y is COO for each of Z1-6 and for each Z1-6 X is selected as n-alkoxy positioned para to Y and fluoride for all other substituents.