| abstract |
The novel esters of a chiral alcohol and a mesogenic carboxylic acid are characterized by the general formula (I) <IMAGE> (I) in which the symbols have the following meanings: n denotes 0 or 1, R1 denotes a straight-chain or branched (C1-C4)alkyl which is unsubstituted or substituted by halogen, in particular fluorine, R2 denotes unsubstituted or substituted (C6-C18)aryl, cyclo(C5-C12)alkyl or mononuclear or binuclear heteroaryl possessing a five-membered and/or six-membered ring, and MC denotes a molecular radical of a mesogenic monocarboxylic acid MC-OH after elimination of an OH group where n=0, and denotes a molecular radical of a mesogenic dicarboxylic acid HO-MC-OH after elimination of two OH groups where n=1, with the exception of compounds in which n denotes 0, R1 denotes CH3, R2 denotes phenyl and MC denotes <IMAGE> These esters are preferably used as admixtures in twistable liquid crystal phases, in which they produce temperature compensation and a large twist. |