Cyclohexane derivatives, liquid crystal compositions comprising the same and liquid crystal display devices
申请人:——
公开号:US20020066888A1
公开(公告)日:2002-06-06
Liquid crystalline compounds are disclosed which have large dielectric anisotropy and relatively low viscosity, and which are represented by formula (1)
1
wherein R
1
represents hydrogen or C
1
-C
15
alkyl in which one or more non-adjacent methylene may be replaced by oxygen, sulfur or —CH═CH— and one or more hydrogen may be replaced by halogen; R
2
represents hydrogen, cyano, halogen or C
1
-C
15
alkyl in which one or more non-adjacent methylene may be replaced by oxygen, sulfur or —CH═CH— and one or more hydrogen may be replaced by halogen; L represents halogen or hydrogen; A
1
, A
2
, A
4
and A
5
each independently represent trans-1,4-cyclohexylene or 1,4-phenylene, one or more —CH
2
— in the trans-1,4-cyclohexylene may be replaced by oxygen or sulfur, one or more ═CH— in the 1,4-phenylene may be replaced by nitrogen, and one or more hydrogen in the 1,4-phenylene ring may be replaced by halogen; A
3
represents trans-1,4-cyclohexylene in which one or more —CH
2
— may be replaced by oxygen or sulfur; Z
1
, Z
2
, Z
3
and Z
4
each independently represent —COO—, —OCO—, —CH
2
CH
2
—, —(CH
2
)
4
—, —CH
2
O—, —OCH
2
—, —CF
2
O—, —OCF
2
— or a single bond; Q represents —CF
2
CH
2
— or —CH
2
CF
2
—; and k, l, m and n each independently represent 0 or 1 with the condition of k+l+m+n≦2. Further, liquid crystal compositions comprising at least one liquid crystalline compound of formula (1) and liquid crystal display devices composed of the compositions are disclosed.
公开了具有大的介电各向异性和相对较低粘度的液晶化合物,其由式(1)表示,其中R1表示氢或C1-C15烷基,其中一个或多个非相邻的亚甲基可以被氧、硫或—CH═CH—所替代,一个或多个氢可以被卤素所替代;R2表示氢、氰基、卤素或C1-C15烷基,其中一个或多个非相邻的亚甲基可以被氧、硫或—CH═CH—所替代,一个或多个氢可以被卤素所替代;L表示卤素或氢;A1、A2、A4和A5分别独立地表示反式1,4-环己烷基或1,4-苯基,反式1,4-环己烷基中的一个或多个—CH2—可以被氧或硫所替代,1,4-苯基中的一个或多个═CH—可以被氮所替代,1,4-苯环中的一个或多个氢可以被卤素所替代;A3表示反式1,4-环己烷基,其中一个或多个—CH2—可以被氧或硫所替代;Z1、Z2、Z3和Z4分别独立地表示—COO—、—OCO—、—CH2CH2—、—(CH2)4—、—CH2O—、—OCH2—、—CF2O—、—OCF2—或单键;Q表示—CF2CH2—或—CH2CF2—;k、l、m和n分别独立地表示0或1,其中k+l+m+n≦2。此外,还公开了包含至少一种式(1)液晶化合物的液晶组合物和由该组合物组成的液晶显示装置。