申请人:Hoffmann-La Roche Inc.
公开号:US05013476A1
公开(公告)日:1991-05-07
A ferroelectric liquid crystal mixture containing at least one compound of the formula ##STR1## wherein n stands for the number 0 or 1; X.sup.1 represents a single covalent bond, --COO-- or --OOC-- and X.sup.2 represents a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 -- or --CH.sub.2 O--; rings A.sup.1, A.sup.2 and A.sup.3 each independently signify 1,4-phenylene optionally substituted with cyano, halogen or lower alkyl or pyrimidin-2,5-diyl, pyrazin-2,5-diyl, when n is 1, trans-1,4-cyclohexylene or trans-m-dioxan-2,5-diyl; with the proviso that one of the rings present stands for pyrimidin-2,5-diyl or pyrazin-2,5-diyl when a further ring signifies trans-1,4-cyclohexylene or when n stands for the number 0 and X.sup.1 stands for a single covalent bond; and R.sup.1 signifies an optionally halogen-substituted alkenyl group with up to 18 carbon atoms in which optionally 1 or 2 non-adjacent CH.sub.2 groups are replaced by --O-- and/or a C.dbd.C double bond; with the proviso that R.sup.1 is different from 3,7-dimethyl-6-octenyloxy; R.sup.2 signifies an optionally halogen-substituted alkyl group with up to 18 carbon atoms in which optionally 1 or 2 non-adjacent CH.sub.2 groups are replaced by --O-- and/or a C.dbd.C double bond; with the proviso that residues R.sup.1 and/or R.sup.2 attached to an aromatic ring have at least 2 chain atoms between the aromatic ring and a C.dbd.C double bond present; as well as novel compounds falling under formula I and novel ferroelectric liquid crystal devices employing the compounds according to the invention.
一种铁电液晶混合物,其中包含至少一种式为##STR1##的化合物,其中n代表数字0或1;X.sup.1表示单一共价键,-COO-或-OOC-,X.sup.2表示单一共价键,-COO-,-OOC-,-CH.sub.2 CH.sub.2-,-OCH.sub.2-或-CH.sub.2 O-;环A.sup.1,A.sup.2和A.sup.3各自独立地表示1,4-苯亚甲基,可选地取代氰基,卤素或低烷基或嘧啶-2,5-二基,吡嗪-2,5-二基,当n为1时,表示反式-1,4-环己亚甲基或反式-m-二氧杂环己烷-2,5-二基;具有以下条件:当进一步的一个环表示反式-1,4-环己亚甲基或n表示数字0且X.sup.1表示单一共价键时,一个存在的环代表嘧啶-2,5-二基或吡嗪-2,5-二基;R.sup.1表示可选地卤代烯基,其中有高达18个碳原子,其中可选地有1或2个非相邻CH.sub.2基被-O-和/或C.dbd.C双键所取代;具有以下条件:R.sup.1与3,7-二甲基-6-辛烯氧基不同;R.sup.2表示可选地卤代烷基,其中有高达18个碳原子,其中可选地有1或2个非相邻CH.sub.2基被-O-和/或C.dbd.C双键所取代;具有以下条件:附加在芳香环上的残基R.sup.1和/或R.sup.2与C.dbd.C双键存在至少2个链原子之间;以及根据公式I的新化合物和采用本发明中化合物的新的铁电液晶器件。