Synthesis and mesomorphic properties of new homological series of the thiobenzoates

Abstract

The synthesis of 4-n-chlorophenyl-4'-n-alkoxythiobenzoates (in short nOSC1) and 4-chlorophenyl-4'-na&oxybenzoylthiobenzoates (in short nOOSC1), where n denoted number of carbon atoms in the alkoxy chain ofthe nOSC1 and nOOSC1 liquid crystalline compounds have been presented. The substances from nOSCi series show existence of liquid crystals phases in convenient temperature range from uses point ofview. The lower homologues possess nematic or nematic and smectic A phases and higher possesses enantiotropic smectic A phase only. The range of smectic A phase changes distinctly upon the elongation of the alkoxy chain. The liquid crystals from the second series, nOOSCl , possess high temperatures of the phase transitions. The temperature ranges of the liquid crystalline phases are distinctly wider for nOOSCi than for nOSCl.