| 摘要 |
A chiral dopant of the formula <IMAGE> I +TR <IMAGE> wherein ring A is 1,4-phenylene which is optionally substituted with one or more fluorine atoms, chlorine atoms, bromine atoms, cyano groups, or methyl groups, and in which one or two CH groups can be replaced by nitrogen, or is trans-1,4-cyclohexylene; Z is a single covalent bond, -CH2CH2-, -CH2O- or -OCH2-; X1,X2,X3,X4 each independently are hydrogen or fluorine; R1 is hydrogen, is alkyl with 1 to 12 carbon atoms which is optionally substituted with one or more fluorine or chlorine atoms and in which one or two non-adjacent CH2 groups can be replaced by -O-, is alkenyl with 2 to 12 carbon atoms, which is optionally substituted with one or more fluorine or chlorine atoms and in which one or two non-adjacent CH2 groups can be replaced by -O-, is a group of the formula <IMAGE> (a) and when R1 is bonded to an aromatic ring, can also be fluorine, chlorine, cyano, CF3, OCHF2 or -OCF3; R2,R3,R4,R5 are alkyl with 1 to 8 carbon atoms or alkenyl with 2 to 8 carbon atoms; n is 0 or 1; and * is a center of chirality.
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