申请人:Merck Patent Gesellschaft mit beschrankter Haftung
公开号:US05236618A1
公开(公告)日:1993-08-17
Liquid crystal phases containing at least one optically active compound of the formula I ##STR1## 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 0 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 0, 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 0 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.
含有至少一种光学活性化合物的液晶相,该化合物的化学式为I,其中X^1和X^2各自独立地为--CO--O--或--O--CO--,X^1和X^2中的一个也可以为--O--,R^1和R^2各自独立地为--(A^1-Z)m-(A^2)n-Y基团,其中A^1和A^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、1,3-二噁烷-2,5-二基、1,3-二硫杂环戊烷-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/或最多12个碳原子的烷基单元进行单取代或多取代,其中烷基单元中的1或2个非相邻的CH2基团可以被0原子替换,Z为--CO--O--、--O--CO--、--CH2CH2--、--OCH2--、--CHO--、--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各自独立地为最多12个碳原子的直链或支链烷基,其中烷基中的1或2个非相邻的CH2基团可以被0原子替换,或者如果n为1或2,则还可以为F、Cl、Br或CN,R^0为最多5个碳原子的烷基、苯基或环己基,显示基本上温度独立的电光参数。