A study of the effect of a lateral methoxy group on the transition temperature of the liquid crystalline phases of the 4-(4-n-heptyloxybenzoyloxy)benzylidene-4-n-alkoxyaniline series

Abstract

Transition temperatures of the liquid crystalline phases for the two homologous series 4-(4-n-heptyloxybenzoyloxy)benzylidene-4-n-alkoxyanilines and 4-(4-n-heptyloxybenzoyloxy)-3-methoxybenzylidene-4-n-alkoxyanilines were measured. A comparison of results between the two series shows that the lateral group lowers the temperature of the nematic–isotropic transition and eliminates a smectic phase.