Structure of optically active compounds and ferroelectric properties of liquid crystals

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Abstract
A new series of optically active dipole dopants - diesters of 4,4″-terphenyl dicarboxylic acid - have been prepared. Most of the components are high melting substances. Some of 2-chlorine substituted compounds show a chiral smectic C* phase. The Ps value induced by optically active dipole dopants depends on several factors such as the magnitude of the dipole moment and the length of the alkyl tail at the C*-atom, the degree to which rotations of the molecule and the chiral center are hindered. In some cases the experimental PS value of the FLC-mixture induced by a pair of dopants with same Ps sign and opposite helix handedness is higher than the sum of the PS values induced by each dopant independently.