申请人:Secretary of State for Defence in her Britannic Majesty's Government of
公开号:US05891358A1
公开(公告)日:1999-04-06
The invention describes liquid crystal compounds of formula (I) which are suitable for use in liquid crystal devices including those devices which exploit the electroclinic effect, ##STR1## where X may be CN, NO.sub.2, CF.sub.3, CF.sub.2 H, CFH.sub.2, halogen, hydrogen, alkyl or alkoxy; X.sub.2 may be CN, NO.sub.2, CF.sub.3, CF.sub.2 H, CFH.sub.2, halogen, hydrogen, alkyl or alkoxy; X.sub.3 may be CN, NO.sub.2, CF.sub.3, CF.sub.2 H, CFH.sub.2, halogen, alkyl, alkoxy or hydrogen; X.sub.4 may be CN, NO.sub.2, CF.sub.3, CF.sub.2 H, CFH.sub.2, halogen, alkyl, alkoxy or hydrogen; provided that at lease one of X or X.sub.2 is CF.sub.3, CF.sub.2 H, CFH.sub.2, CN, NO.sub.2 or halogen; A and B are independently phenyl, mono-fluorinated phenyl, di-fluorinated phenyl or cyclohexyl; Y may be single bond, COO, OOC, C.dbd.C; q may be 0 or 1; R.sub.1 may be an end group of formula (II) wherein Z may be a single bond, O, CO.sub.2, (CH.sub.2).sub.n or (CH.sub.2).sub.n O where n may be 1 or 2; J and M may be independently H, C.sub.1-4 alkyl; W may be C.sub.1 -C.sub.12 straight or branched alkyl chain; R.sub.2 may contain 1-14 carbon atoms wherein one or more non-adjacent CH.sub.2 groups may be replaced by CO.sub.2 or O. X or X.sub.2 may give rise to steric hindrance with the nearest terminal group. The materials of the current invention may be mixed together and/or with other liquid crystal compounds. Suitable devices which the materials of the present invention may be incorporated in include beam steerers, piezoelectric actuators or sensors and pyroelectric sensors and displays in general. The materials of the present invention may also be useful as dopants in ferroelectrics and as second order non-linear optic materials for second harmonic conversion of light.
本发明描述了公式(I)的液晶化合物,适用于液晶装置,包括利用电致伸缩效应的装置,其中X可以是CN,NO.sub.2,CF.sub.3,CF.sub.2H,CFH.sub.2,卤素,氢,烷基或烷氧基; X.sub.2可以是CN,NO.sub.2,CF.sub.3,CF.sub.2H,CFH.sub.2,卤素,氢,烷基或烷氧基; X.sub.3可以是CN,NO.sub.2,CF.sub.3,CF.sub.2H,CFH.sub.2,卤素,烷基,烷氧基或氢; X.sub.4可以是CN,NO.sub.2,CF.sub.3,CF.sub.2H,CFH.sub.2,卤素,烷基,烷氧基或氢; 前提是X或X.sub.2中至少有一个是CF.sub.3,CF.sub.2H,CFH.sub.2,CN,NO.sub.2或卤素; A和B分别是苯基,单氟苯基,双氟苯基或环己基; Y可以是单键,COO,OOC,C.dbd.C; q可以是0或1; R.sub.1可以是公式(II)的末端基团,其中Z可以是单键,O,CO.sub.2,(CH.sub.2).sub.n或(CH.sub.2).sub.nO,其中n可以是1或2; J和M可以独立地是H,C.sub.1-4烷基; W可以是C.sub.1-C.sub.12直链或支链烷基链; R.sub.2可以包含1-14个碳原子,其中一个或多个非相邻的CH.sub.2基团可以被CO.sub.2或O所替换。 X或X.sub.2可能会导致与最近的端基产生空间位阻。本发明的材料可以混合在一起和/或与其他液晶化合物混合。适用于本发明材料的装置包括光束偏转器,压电致动器或传感器,热释电传感器和显示器。本发明的材料还可以用作铁电体的掺杂剂,以及用于光的二次谐波转换的二阶非线性光学材料。