The novel compounds are aryl-2,3-epoxyalkyl ethers or thioethers or the corresponding thiirane compounds having a mesogenic aromatic component and a chiral component having a three-membered heterocyclic ring, wherein, in the general formula (1), ##STR1## the symbols have the following meaning: R.sup.1 =straight-chain or branched (C.sub.1 -C.sub.12) alkyl, where one or two non-neighboring CH.sub.2 groups may be replaced by O or S atoms. A=diazine-2,5-diyl or diazine-3,6-diyl, X and Y=O and/or S, and R.sup.2, R.sup.3 and R.sup.4, independently of one another=H, straight-chain (C.sub.1 -C.sub.10) alkyl or branched (C.sub.3 -C.sub.10) alkyl, where R.sup.2, R.sup.3 and R.sup.4 are not simultaneously H. The compounds are preferably employed in tilted smectic liquid-crystal phases which they convert into ferroelectric liquid-crystal phases; they have high values for spontaneous polarization or they induce high values for spontaneous polarization.
这些新化合物是含有介向芳香组分和手性组分的芳基-2,3-环
氧烷基醚或
硫醚,或者是相应的含有三元杂环环的
硫杂环化合物。在通式(1)中,##
STR1## 符号的含义如下:R1=直链或支链(C1-C12)烷基,其中一个或两个非相邻的
CH2基团可以被O或S原子替换。A=二嗪-2,5-二基或二嗪-3,6-二基,X和Y=O和/或S,R2、R3和R4独立地=H、直链(C1-C10)烷基或支链(C3-C10)烷基,其中R2、R3和R4不同时为H。这些化合物通常用于倾斜的
液晶相中,将其转化为
铁电
液晶相;它们具有高的自发极化值或者能够诱导高的自发极化值。