Fluoro-substituted alkenyl compounds, liquid crystal compositions, and liquid crystal display elements
申请人:——
公开号:US20020015805A1
公开(公告)日:2002-02-07
The invention relates to a fluoro-substituted alkenyl compound represented by formula (1)
1
wherein Y
1
, Y
2
, Y
3
and Y
4
are each independently H or F, provided that at least one of Y
1
and Y
2
is F; Q
1
is a single bond or an alkylene group of 1-20 carbon atoms, at least one —CH
2
— being optionally substituted by —O—, provided that two or more —O— are not adjacent to each other; Q
2
is a single bond or —C≡C—; Rings A
1
, A
2
and A
3
are each independently a cyclohexane ring, a dioxane ring, a cyclohexene ring, a pyrimidine ring, a pyridine ring, or a benzene ring, or a benzene ring having at least one hydrogen atom substituted by F; Z
1
, Z
2
and Z
3
are each independently a single bond, —CH
2
CH
2
—, —CH
2
O—, —OCH
2
—, —COO—, —OCO—, —CH═CH—, —C≡C—, —CF
2
O—, or —OCF
2
; and m and n are each independently 0 or 1; provided that Y
3
is F when Ring A
3
is a cyclohexane ring and Z
3
is a single bond. The liquid crystal composition comprising the compound, when used in liquid crystal display elements for various modes, excels in driving voltage and contrast.
该发明涉及一种由式(1)表示的含氟取代烯基化合物
1
其中Y
1
,Y
2
,Y
3
和Y
4
分别独立地为H或F,但至少其中之一为F;Q
1
为1-20个碳原子的单键或烷基基团,至少一个—CH
2
—可选择地被—O—取代,但两个或更多个—O—不相邻;Q
2
为单键或—C≡C—;环A
1
,A
2
和A
3
分别独立地为环己烷环,二氧六环,环己烯环,嘧啶环,吡啶环或苯环,或至少有一个氢原子被F取代的苯环;Z
1
,Z
2
和Z
3
分别独立地为单键,—CH
2
CH
2
—,—CH
2
O—,—OCH
2
—,—COO—,—OCO—,—CH═CH—,—C≡C—,—CF
2
O—或—OCF
2
;m和n分别独立地为0或1;但当环A
3
为环己烷环且Z
3
为单键时,Y
3
为F。包括该化合物的液晶组合物,在用于各种模式的液晶显示元件时,具有出色的驱动电压和对比度。