Liquid Crystal Formation in Binary Systems. V. Liquid Crystals Induced in N-[4-(Dimethylamino)benzylidene]-4-ethoxyaniline-N-(4-Nitrobenzylidene)-4-nitroaniline and Related Mixtures

Abstract

Abstract The induction of liquid crystals was demonstrated with binary mixtures comprising N-(4-nitrobenzylidene)-4-nitroaniline and N-[4-(dimethylamino)benzylidene]-4-alkoxyaniline or N-(4-alkoxybenzylidene)-4-(dimethylamino)aniline. Both nematic and smectic phases were observed with the ethoxy derivatives, but only a smectic A phase with the propoxy derivatives. The mesophases appear in the region centered around 30 mol% of the dinitro compound. Similarly, liquid crystals could be induced in several mixtures of N-[4-(dialkylamino)benzylidene]-4-(dialkylamino)aniline with N-(4-nitrobenzylidene)-4-alkoxyaniline or N-(4-alkoxybenzylidene)-4-nitroaniline. The bis(dialkylamino) and dinitro derivatives of azoxybenzene were also shown to be efficient as one of the component compounds in producing binary liquid crystals.