- Liquid crystalline compounds containing the bicyclo[2,2,2]-octane ring and the phenylisothiocyanate group, their manufacturing and liquid crystalline mixtures containing same
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New liquid crystalline compounds containing the bicyclo[2,2,2]octane ring and the phenylisothiocyanato group in their molecules of the general formula 1: wherein: R is a normal or branched alkyl H2n+1Cn- or alkenyl H2n-1Cn- group containing up to 15 carbon atoms, some of the hydrogen atoms in the alkyl chain being sometimes substituted by a fluorine atom, Z is a single bond or -COO-, -OOC-, -CH2O- or -C≡C- group, the ring A is a 1,4-disubstituted benzene ring or 2,5-disubstituted pyrimidine ring or a 2,5-disubstituted pyridine ring or a 2,5-disubstituted 1,3-dioxane ring, m stands an integer 0 or 1, X1, X2 and X3 are identical or different and each of them denotes a hydrogen atom or a fluorine atom or a chlorine atom or a bromine atom or a cyano group, however, if m=1 and the ring A is not a benzene ring then Z is also a -CH2CO-, -CO-CH2-, -CH=CH-, CHYCH2-, -CH2-CHY-, -C6H4-CH2-CHY-, -C6H4-CHY-CH2-, or C6H4-C≡C- group where Y is a hydrogen atom or a fluorine atom or a chlorine atom or a cyano group or a methoxy group or a hydroxy group are prepared and used as component of liquid crystal mixture. Method manufacturing of compounds 1, the liquid crystal mixture containing compounds 1 and their use for electrooptical devices are described.
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- Liquid crystal 2,3-dicyano-hydroquinone derivatives
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Liquid crystal materials for liquid crystal display, having a large negative dielectric anisotropy and maintaining a liquid crystal state at a broad temperature range including room temperature are provided. These materials contain novel compounds expressed by the general formula (I) STR1 wherein X represents STR2 Y represents STR3 R1 and R3 each represent an alkyl group or an alkyloxy group of 1-10 carbon atoms; R2 and R4 each represent an alkyl group of 1-10 carbon atoms; but compounds wherein STR4 are excluded.
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