摘要:
Difluorophenylpyrimidylpyridine derivatives of the formula (I) ##STR1## wherein X is N and Y is CH or X is CH and Y is N;R.sup.1 and R.sup.2 are identical or different and area) an unbranched or branched alkyl chain having 1 to 20 carbon atoms, whereaa) one or more non-adjacent and non-terminal CH.sub.2 groups may be replaced by --O--, --CO--O--, --O--CO--, --O--CO--O-- or --Si(CH.sub.3).sub.2 --, and/orab) one or more H atoms may be replaced by F, and/orac) the terminal CH.sub.3 group may be replaced by one of the following chiral groups (optically active or racemic): ##STR2## R.sup.3, R.sup.4 and R.sup.5 are identical or different and are hydrogen or a straight-chain or branched alkyl radical having 1-16 carbon atoms (with or without an asymmetrical carbon atom), where, in addition, one or more non-adjacent non-terminal CH.sub.2 groups may be replaced by --O--, and/or where one or more H atoms of the alkyl radical may be substituted by --F; R.sup.4 and R.sup.5 may alternatively together be --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.5 -- if they are bonded to a dioxolane system,are suitable as components, in particular, of ferroelectric liquid-crystal mixtures.
摘要:
Fluorinated five-membered ring compounds of the formula (I) R1—X—(A1—M1)a—(A2—M2)b—A3—Y—E (I) where E is a radical T—Z—R2 containing a five-membered ring and, for example, T is undirected and is 4-fluorothiophene-2,5-diyl, 3-fluorothiophene-2,5-diyl, 3-fluorothiophene-2,4-diyl, 5-fluorothiophene-2,4-diyl, furan-2,5-diyl, furan-2,4-diyl, isoxazole-3,5-diyl, thiazole-2,5-diyl, thiazole-2,4-diyl, cyclopentane-1,3-diyl or cyclopentene-1,3-diyl, R1 and R2 are hydrogen, X is a single bond, —O—, OC(═O)—, —C(═O)O— or —OC(═O)O—, Y is —OC(═O)—, —OCH2—, —CH2CH2—, Z is a single bond or —O—, A1, A2, A3 are each, independently of one another, phenylene-1,4-diyl, M1, M2 are undirected and are each, independently of one another, —OC(═O)—, —OCH2—, —CH2CH2—, —OC(═O)CH2CH2—, —OCH2CH2CH2—, —C≡C—, —CH2CH2CH2CH2— or a single bond, a, b are each, independently of one another, 0 or 1, are used in FLC mixtures.
摘要:
Liquid crystal mixture comprising one or several compounds of formula (I) (I) wherein R1, R2, R3, R4, R5, R6, M1, M2, X, A, and m are defined herein.
摘要:
In a monostable ferroelectric active matrix display comprising a liquid-crystal layer in the form of a monodomain having an unambiguously defined direction of the layer normals z of the smC* phase, the layer normals z and the preferential direction n of the nematic or cholesteric phase (N* phase) form an angle of more than 5°.
摘要:
Liquid crystal mixture comprising compounds of formula (I) wherein R1: is H or a linear or branched alkyl group or branched alkenyl group R2: stands for a) H or F b) a linear or branched alkyl group or a linear or branched alkenyl group c) a radical wherein R3, R4, R5, R6: are an alkyl group M1, M2: represent independently from another a single bond, —OC(═O), —C(═O)O—, —OCH2—, —NH— A: is a) a linear or branched alkan-α,ω-diylgroup or alkene-α,ω-diyl group b) the group —C(═Y)— wherein Y is CH-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogenatoms, alkyl or alkyloxy groups, c) the group —CHY wherein Y is CH2-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogenatoms, alkyl or alkyloxy groups d) a group wherein p, q are 0, 1 or 2; M3 is a single bond or —OC(═O)—, —C(═O)O—, —OCH2—, —CH2O—, —C≡C—, —CH2CH2—, —CH2CH2CH2CH2— the radicals are phenylen-1,4-diyl, X is H, OH, a linear or branched alkyl or alkyloxy group, m: is 0 or 1 X and M1-(A)m-M2-R2 together can constitute a) a ring of 4 to 16 members, b) a combination of two either directly linked or spiro-linked rings.
摘要:
A ferroelectric liquid crystal mixture having a negative value of &Dgr;e and allowing a high speed response and a low voltage driving, as well as a liquid crystal display devise using the crystal mixture of the invention. The ferroelectric liquid crystal mixture according to the invention comprises two or more compounds from at least two different of the following classes of compounds: A. thiadiazoles, B. phenanthrenes, C. 2-fluoropyridines, D. difluorobenzenes, E. meta-substituted aromatic compounds.
摘要:
In a monostable ferroelectric active matrix display comprising a liquid-crystal layer in the form of a monodomain having an unambiguously defined direction of the layer normal z of the smC* phase, the layer normals z and the preferential direction n of the nematic or cholesteric phase (N* phase) form an angle of more than 5°.
摘要:
A liquid-crystalline medium based on a mixture of polar compounds having at least one compound of the formula I in which R11, R12 and have the meanings indicated in claim 1, is described. Also described is the use thereof for an active-matrix display based on the VA, ECB, PALC, FFS or IPS effect.