| 摘要 |
A ferroelectric liquid crystalline mixture containing at least one optically active compound of the general formula <IMAGE> I wherein X1 denotes a single covalent bond, -COO-, -OOC-, -CH2CH2-, -OCH2- or -CH2O-; one of rings A1, A2 and A3 represents trans-m-dioxan-2,5-diyl and the other two of rings A1, A2 and A3 each independently represent unsubstituted 1,4-phenylene or 1,4-phenylene substituted with cyano, halogen or lower alkyl; R1 and R2 each independently signify an optionally halogen-substituted alkyl group with up to 18 carbon atoms in which optionally 1 CH2 group or 2 non-adjacent CH2 groups is/are replaced by -O-, -CO-, -COO- and/or -OOC-, as well as novel compounds falling under formula I and ferroelectric electrode-optical indicating devices including same.
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