Liquid crystal compounds having bis(trifluoromethyl)phenyl rings, liquid crystal compositions and liquid crystal display devices
申请人:CHISSO CORPORATION
公开号:EP1245660A2
公开(公告)日:2002-10-02
The compound (1) having 2,3-bis(trifluoromethyl)-1,4-phenylene is stable chemically and has excellent miscibility with other liquid crystal compounds, large and negative dielectric anisotropy and proper optical anisotropy. A liquid crystal composition comprising the compound has large specific resistance and a large voltage holding ratio, and that the composition is useful for a liquid crystal display element. The compound (1) is represented by formula (1):
wherein Ra and Rb independently are alkyl having 1 to 20 carbons, any -CH2- in the alkyl may be replaced by -O-, -S-, -CH=CH-, or -C≡C-, and any hydrogen may be replaced by halogen; A1, A2, A3, and A4 independently are 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,3-dioxane-2,5-diyl, 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, pyridazine-3,6-diyl, or 2,3-bis(trifluoromethyl)-1,4-phenylene, any hydrogen in these rings may be replaced by halogen, and at least one of A1, A2, A3, and A4 is 2,3-bis (trifluoromethyl)-1,4-phenylene; Z1, Z2 and Z3 independently are a single bond, -(CH2)2-, -(CF2)2-, -COO-, -OCO-, -CH2O-, -OCH2-, -CF2O-, -OCF2-, -CH=CH-, -CF=CF-, -C≡C-, -(CH2)4-, -(CH2)3O-, or -O(CH2)3-; m and n independently are 0 or 1.
具有 2,3-双(三
氟甲基)-1,4-亚苯基的化合物 (1)
化学性质稳定,与其他液晶化合物的混溶性极佳,具有较大的负介电各向异性和适当的光学各向异性。由该化合物组成的液晶组合物具有较大的比电阻和较大的电压保持比,该组合物可用于液晶显示元件。化合物(1)由式(1)表示:
其中 Ra 和 Rb 独立地为具有 1 至 20 个碳原子的烷基,烷基中的任何 -
CH2- 可被 -O-、-S-、-CH=CH- 或 -C≡C- 取代,任何氢可被卤素取代;A1、A2、A3 和 A4 分别独立地为 1,4-
环己烯、1,4-
环己烯、
1,3-二氧六环-2,5-二基、1,4-亚苯基、
吡啶-2,5-二基、
嘧啶-2,5-二基、
哒嗪-3,6-二基或 2、3-双(三
氟甲基)-1,4-亚苯基,这些环中的任何氢均可被卤素取代,且 A1、A2、A3 和 A4 中至少有一个是 2,3-双(三
氟甲基)-1,4-亚苯基;Z1、Z2 和 Z3 分别为单键、-( )2-、-(
CF2)2-、-COO-、-OCO-、- O-、-O -、-
CF2O-、-O
CF2-、-CH=CH-、-CF=CF-、-C≡C-、-( )4-、-( )3O- 或 -O( )3-;m 和 n 分别为 0 或 1。