| 摘要 |
<p>A polycyclic compound of general formula (I): R?1 - X1 - [A1 - X2] - [A2 - X3] - R2¿ (=wherein R1 is C6-C16 (halo)alkyl; X1 is -O- or a single bond; A1 is biphenylene, phenylene or the like; A2 is 1-fluoro-3,4-dihydronaphthalene or the like; X?2 and X3¿ are each -COO-, a single bond or the like; and R2 is an optically active group having at least one asymmetric carbon atom and 4 to 20 carbon atoms); a liquid-crystal material composed of the above polycyclic compound; and a liquid-crystal composition and a liquid-crystal device containing the material. This novel polycyclic compound is optically active, exhibits a smectic phase over a wide temperature range including room temperatures, and can be used as a ferroelectric or antiferroelectric liquid-crystal material. The use of the liquid-crystal material makes it possible to produce a liquid-crystal device exhibiting a rapid response over a wide temperature range.</p> |
