摘要:
Fluorinated naphthalene derivatives of the formula (I) R1(—A1—M1)a(—A2—M2)b—B—(—M3—A3)c—(M4—A4)d—R2 (I) where B is having the meaning and R1(—A1—M1)a(—A2—M2) and (—M3—A3)(M4—A4)R2 are mesogenic radicals, are suitable as components of liquid-crystal mixtures, in particular ferroelectric liquid-crystal mixtures.
摘要:
A ferroelectric liquid crystal mixture, especially useful for operation in the &tgr;Vmin−mode, comprises a 5-Arylindane derivative of the formula (I), wherein Y is CH, CF or N and R1(—A1—M1)a(—A2—M2)b—, (M3—A3—)cR2 are mesogenic groups.
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:
A chiral smectic liquid crystal mixture, especially useful for operation in the .tau.V.sub.min -mode, comprises a substituted 1,2-difluornaphthaline derivatives of the formula (I),R.sup.1 (--A.sup.1 --M.sup.1).sub.a (--A.sup.2 --M.sup.2).sub.b --B--(M.sup.3 --A.sup.3 --).sub.c (M.sup.4 --A.sup.4 --).sub.d R.sup.2 (I)wherein the symbols and indices have the following meanings:B is ##STR1## or ##STR2## X is H or F; Y is H, F or together O, andR.sup.1 (--A.sup.1 --M.sup.1).sub.a (--A.sup.2 --M.sup.2).sub.b --, (M.sup.3 --A.sup.3 --).sub.c (M.sup.4 --A.sup.4 --).sub.d R.sup.2 are mesogenic groups.
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:
A smectic liquid-crystal mixture containing rod-shaped molecules having only one side chain and certain phenylpyrimidine derivatives. The liquid-crystal mixtures according to the invention are distinguished by a low melting point and a high S.sub.C /S.sub.A phase-transition temperature. The use of bisesters of the formula I allows the number of phenylpyrimidine derivatives in the mixtures according to the invention to be significantly reduced. Ferroelectric mixtures according to the invention have, in particular, high contrast, good alignment, a large margin, low flicker and a large angle in the chevron geometry.
摘要:
Smectic liquid-crystal mixture A liquid-crystalline mixture comprises, inter aliaA. at least one compound of the formula I ##STR1## and/or at least one compound of the formula (II) ##STR2## B. at least one compound of the formula (III)R.sup.1 (-A.sup.1).sub.a (-M.sup.1).sub.b (-A.sup.2).sub.c (-M.sup.2).sub.d (-A.sup.3).sub.e (-M.sup.3).sub.f (-A.sup.4)-H (III)C. and at least one compound of the formula (IV) ##STR3##The mixture has a low melting point and a broad S.sub.c phase range.
摘要:
A smectic liquid-crystal mixture comprisingA. at least one compound of the formula (I) ##STR1## B. at least one compound of the formula (III) ##STR2## C. compounds of the formula (IV)R.sup.1 --O--CO--O--(--A.sup.1).sub.a (--M.sup.1).sub.b (--A.sup.2).sub.c (--M.sup.2).sub.d (--A.sup.3).sub.e (--O).sub.f --R.sup.2 (IV)in which:R.sup.1 and R.sup.2 are identical or different and are a straight-chain or branched alkyl group having 1 to 22 or 3 to 22 carbon atoms respectively,A.sup.1, A.sup.2 and A.sup.3 are identical or different and are 1,4-phenylene, where one or two H atoms may also be replaced by F, 2,5-pyrimidinediyl,and further smectogenic compounds and, if desired, dopants. The mixture exhibits a low melting point and a broad S.sub.c phase.
摘要:
5-Fluorophenanthridine derivatives and their use in liquid-crystalline mixtures 6-Fluorophenanthridine derivatives of the formula (I) ##STR1## in which G is --CF.dbd.N--,E.sup.1, E.sup.2, E.sup.3, E.sup.4, E.sup.5 and E.sup.6 are identical or different and are --CH--, --CF-- or --N--and R.sup.1 (--A.sup.1 --M.sup.1).sub.a (--A.sup.2 --M.sup.2).sub.b, (M.sup.3 --A.sup.3 --).sub.c (M.sup.4 --A.sup.4 --).sub.d R.sup.2 denote mesogenic radicalsare suitable as components for liquid-crystalline mixtures, especially ferroelectric mixtures.
摘要:
1,3-Difluoronaphthalene derivatives of the formula (I)R.sup.1 (--A.sup.1 --M.sup.1).sub.a (--A.sup.2 --M.sup.2).sub.b --B(--M.sup.3 --A.sup.3).sub.c (--M.sup.4 --A.sup.4).sub.d --R.sup.2 (I)in whichB is ##STR1## and R.sup.1 (--A.sup.1 --M.sup.1).sub.a (--A.sup.2 --M.sup.2) and (--M.sup.3 --A.sup.3)(--M.sup.4 --A.sup.4)R.sup.2 denote mesogenic radicals are suitable as components for liquid-crystal mixtures, especially ferroelectric mixtures.