POLYCYCLIC COMPOUND, LIQUID-CRYSTAL MATERIAL COMPOSED OF THE COMPOUND, AND LIQUID-CRYSTAL COMPOSITION AND LIQUID-CRYSTAL DEVICE CONTAINING THE MATERIAL
申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0826659A1
公开(公告)日:1998-03-04
Disclosed is a polycyclic compound represented by the following formula (I):
R1-X1-[A1-X2]-[A2-X3]-R2 (I)
wherein R1 is a (halogenated) alkyl group of 6 to 16 carbon atoms, X1 is -O- group or a single bond, A1 is a biphenylene group, a phenylene group or the like, A2 is 1-fluoro-3,4-dihydronaphthalene or the like, X2 and X3 are each -COO-, a single bond or the like, and R2 is an optically active group of 4 to 20 carbon atoms which has at least one asymmetric carbon atom. Also disclosed are a liquid crystal material consisting of the polycyclic compound, a liquid crystal composition comprising the liquid crystal material, and a liquid crystal element. This novel polycyclic compound is optically active and capable of being in a smectic phase in a wide temperature range including room temperature. The polycyclic compound can be used as a ferroelectric liquid crystal material or an antiferroelectric liquid crystal material. By the use of the liquid crystal material of the invention, a liquid crystal element having a quick response speed in a wide temperature range can be obtained.
本发明公开了一种由下式 (I) 表示的多环化合物:
R1-X1-[A1-X2]-[A2-X3]-R2 (I)
其中 R1 是 6 至 16 个碳原子的(卤代)烷基,X1 是-O-基团或单键,A1 是联苯基团、亚苯基或类似基团,A2 是 1-氟-3,4-二氢萘或类似基团,X2 和 X3 分别是-COO-、单键或类似基团,R2 是 4 至 20 个碳原子的光学活性基团,其中至少有一个不对称碳原子。此外,还公开了一种由该多环化合物组成的液晶材料、一种由该液晶材料组成的液晶组合物和一种液晶元件。这种新型多环化合物具有光学活性,能够在包括室温在内的较宽温度范围内处于熔融相。这种多环化合物可用作铁电液晶材料或反铁电液晶材料。通过使用本发明的液晶材料,可以获得在宽温度范围内具有快速响应速度的液晶元件。