申请人:Merck Patent Gesellschaft Mit Beschrankter Haftung
公开号:US04744918A1
公开(公告)日:1988-05-17
Liquid crystal phases containing at least one optically active compound of the formula I R.sup.1 --X.sup.1 --CHR.sup.o (CH.sub.2).sub.p X.sup.2 --R.sup.2 I wherein X.sup.1 and X.sup.2 independently of one another are each --CO--O-- or --O--CO--, one of X.sup.1 and X.sup.2 may also be --O--, R.sup.1 and R.sup.2 independently of one another are each a group --(A.sup.1 --Z).sub.m --(A.sup.2).sub.n -Y, wherein A.sup.1 and A.sup.2 in each case independently of one another are a 1,4-phenylene, pyrimidine-2,5-diyl, pyrazine-2,5-diyl, pyridine-2,5-diyl, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,3-dithiane-2,5-diyl or 1,4-bicyclo(2,2,2)-octylene group, it also being possible for this to be monosubstituted or polysubstituted by F, Cl, Br, CN and/or alkyl groups with up to 12 C atoms, and it being possible for 1 or 2 non-adjacent CH.sub.2 groups in the alkyl groups to be replaced by O atoms, Z is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --CH.dbd.N--, --N.dbd.CH--, --N.dbd.N--, --N(O).dbd.N-- or a single bond, m and n in each case independently of one another are O, 1 or 2, Y is independently of one another a straight-chain or branched alkyl group with up to 12 C atoms, it being possible for 1 or 2 non-adjacent CH.sub.2 groups to be replaced by O atoms, or, if n is 1 or 2, also F, Cl, Br or CN, R.sup.0 is an alkyl group with up to 5 C Atoms or a phenyl group or a cyclohexyl group, display largely temperature-independent electrooptical parameters.
含有至少一个光学活性化合物的液晶相,其化学式为I R.sup.1 --X.sup.1 --CHR.sup.o (CH.sub.2).sub.p X.sup.2 --R.sup.2 I,其中X.sup.1和X.sup.2各自独立地为--CO--O--或--O--CO--,X.sup.1和X.sup.2中的一个也可以是--O--,R.sup.1和R.sup.2各自独立地为--(A.sup.1--Z).sub.m--(A.sup.2).sub.n-Y的基团,其中A.sup.1和A.sup.2各自独立地为1,4-苯撑基、嘧啶-2,5-二基、吡嗪-2,5-二基、吡啶-2,5-二基、1,4-环己撑基、1,3-二氧杂环-2,5-二基、1,3-二硫杂环-2,5-二基或1,4-双环(2,2,2)-辛撑基,也可以通过F、Cl、Br、CN和/或碳链长度不超过12的烷基基团进行单取代或多取代,烷基基团中的1或2个非相邻CH.sub.2基团可以被O原子取代,Z是--CO--O--、--O--CO--、--CH.sub.2 CH.sub.2 --、--OCH.sub.2--、--CH.sub.2 O--、--CH.dbd.N--、--N.dbd.CH--、--N.dbd.N--、--N(O).dbd.N--或单键,m和n各自独立地为0、1或2,Y是独立的直链或支链烷基基团,长度不超过12个碳原子,烷基基团中的1或2个非相邻CH.sub.2基团可以被O原子取代,或者如果n为1或2,则也可以是F、Cl、Br或CN,R.sup.0是长度不超过5个碳原子的烷基基团、苯基或环己基,显示具有大部分温度无关的电光参数。