Liquid Crystals with Polar Substituents Containing Fluorine: Synthesis and Physical Properties

Liquid crystalline compounds with various polar terminal groups containing fluorine have been prepared (see below formula 1 with Z = S‒CHF2, S‒CF3, SO‒CHF2, SO‒CF3, SO2‒CHF2, SO2‒CF3, SO2F, OCH2CF3, CO‒OCH2CF3, CO‒CF3, CO‒CF2Cl, CO‒CF2H, CO‒CF2‒CH3, CO‒CF2‒C3H7). The synthesis of these compounds is outlined here and their physical properties (phase transitions, dielectric anisotropy, birefringence, viscosity) are discussed.