Chiral organic compounds in liquid crystal systems with induced helical structure

In this work, some of the most important characteristics of chiral compound s as components of the liquid crystal (LC) systems are discussed. These cha racteristics are the helical twisting power of chiral dopants (CDs) in the induced cholesteric (N*) mesophases, the temperature dependence of the indu ced helical pitch (P) quantified by the dP/dT parameter and the influence o f the CDs on the N* mesophase thermal stability characterized by the dT(iso )/dC parameter. The molecular structure influence on them for several syste matic series of the N-arylidene derivatives of (S)-1-phenyl- and (S)-1-benz ylethylamines as well as the chiral diastereomeric 2-arylidene-p-menthane-3 -ones is considered.