| 摘要 |
<p>"NEMATIC COMPOUNDS CONTAINING CYCLOHEXYL GROUPS" Nematic compounds with a negative DC anisotropy, characterised by the formula I I in which m = 1 or 2, r is zero or 1 and m + r = 1 or 2, and R1 and R2 are identical or different and are selected from alkyl and alkoxy groups each having 1 - 12 carbon atoms in a straight or branched chain, which may be chiral, Z is a bridge member selected from a single bond and the groups of the formulae -CH2CH2-, -OCH2-, -O-CO- or -CO-O-, one of the groups X and Y is selected from fluorine, chlorine, bromine and cyano and the other of the groups X and Y is selected from hydrogen, fluorine, chlorine, bromine and cyano, with the proviso that m = r = 1 if X and Y are both cyano, are suitable as components for liquid crystal mixtures having an overall negative DC anisotropy, such as are required in particular for electro-optical displays of the type of guest/host displays or homotropic-nematic displays.</p> |
