| 摘要 |
<p>The present invention provides compounds of formula (I) and liquid-crystal compositions containing the compounds, in which R1 is, for example, a straight-chain or branched alkyl radical having 1 to 22 carbon atoms, in which one -CH¿2?- group may be replaced by -O- or -CO-O-; and the group -(A?1)¿a(-M1)(-A2)b(-M2)(-A3)c(M3)- is any one of following groups : (α), (β), (η), (δ), (ε), (ζ). The compound of the present invention is useful as a component of smectic or ferroelectric liquid-crystal compositions having a broad temperature range of a smectic C phase, particularly having a broad temperature range in a lower temperature region.</p> |
