申请人:Merck Patent Gesellschaft mit beschrankter Haftung
公开号:US04637897A1
公开(公告)日:1987-01-20
Nematic compounds with a negative DC antisotropy, characterized by the formula I ##STR1## in which m=1 or 2, r is zero or 1 and m+r=1 or 2, and R.sup.1 and R.sup.2 are identical or different and are selected from alkyl and alkoxy groups each having 1-12 carbon atoms in a straight or branched chain, which may be chiral, Z is a bridge member selected from a single bond and the groups of the formulae --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --O--CO-- or --CO--O--, one of the groups X and Y is selected from fluorine, chlorine, bromine and cyano and the other of the groups X and Y is selected from hydrogen, fluorine, chlorine, bromine and cyano, with the proviso that m=r=1 if X and Y are both cyano, are suitable as components for liquid crystal mixtures having an overall negative DC anisotropy, such as are required in particular for electro-optical displays of the type of guest/host displays or homotropic-nematic displays.
呈现公式 I 的负直流反各向异性的向列相化合物,其中 m=1 或 2,r 为零或 1,且 m+r=1 或 2,R.sup.1 和 R.sup.2 相同或不同,选择自具有 1-12 个碳原子的直链或支链烷基和烷氧基,可能手性,Z 为从单键和公式 --CH.sub.2 CH.sub.2 --、--OCH.sub.2 --、--O--CO-- 或 --CO--O-- 的基团中选择的桥接成员,X 和 Y 中的一个选择自氟、氯、溴和氰,另一个选择自氢、氟、氯、溴和氰,条件是如果 X 和 Y 都是氰,则 m=r=1,适用作具有整体负直流各向异性的液晶混合物的组分,特别适用于需要这种性质的电光显示,如客体/宿主显示或同向向列相显示。