| 摘要 |
<p>Compounds are provided of the formula for use in a range of liquid crystal display devices (formula I) wherein n may be 0, 1 or 2, A1, A2, A3 are independently chosen from 1,4-disubstituted benzene, 2,5-disubstituted pyridine, 2,6-disubstituted naphthalene; laterally substituted 1,4-disubstituted benzene, laterally substituted 2,5-disubstituted pyrimidine, laterally substituted 2,5-disubstituted pyridine, laterally substituted 2,5-disubstituted naphthalene wherein the lateral substituents are independently selected from F, CI, Br or CN and may be present in any of the available substitution positions; 1,4-disubstituted bicyclo(2.2.2)octane, trans-1,4-disubstituted cyclohexane, trans-2,5-disubstituted dioxane, 1,4-disubstituted piperidine, Z1, Z2 are independently chosen from a direct bond, COO, OOC, C2H4, CH2O, OCH2, C4H8, C3H6O, (E)-CH=CHC2H4, (Z)-CH2CH=CHCH2, (E)-CH=CHCH2O, -C≡C-, Z3 may be C4H8, OC3H6, (E)-CH=CHC2H4, (Z)-CH2CH=CHCH2, (E)-OCH2CH=CH, -C≡C-, C2H4; R may be alkyl, alkoxy, alkenyl, alkenyloxy, alkanoyloxy, alkenoyloxy or OCmF2m+1, R may contain 1 to 20 carbon atoms and may be branched or a straight chain m is 1-20.</p> |
