| abstract |
Compounds with the general formula have a pronounced tendency to form liquid-crystalline S (smectic) phases. Thus, in addition to a nematic phase, optically inactive compounds of the formula I also have a tilted-smectic phase, in particular an S C phase. In contrast to this, many optically active compounds of the formula I have, in addition to a cholesteric phase, also a tilted-smectic chiral phase, in particular a chiral SC phase. The compounds mentioned are therefore particularly suitable as components or as dopants for producing a wide variety of liquid crystal mixtures. The class of compounds with compounds of the general formula I offers a wide range of new components and mixtures for optimizing and modifying liquid crystal mixtures. |