Thermotropic P, P'-Disubstituted Phenyl Benzamide

Abstract

Abstract A numerous number of aromatic thermotropic liquid crystals have been reported in the literature, and also reviewed by Brown and others1. These liquid crystals are generally composed of two or more p-substituted aromatic rings which are connected by a central group such as CO2, multiple bonds (C˭C, C˭C, C˭N, N=N, etc.), or hydrogen bonding of dimeric acid. A class of nematic liquid crystalline p, p'-disubstituted phenyl thiolbenzoates2 has recently been disclosed. We now wish to report microscopic observations relating to the thermotropic behavior of 4-n-cetyloxy-N-4′-cyanophenyl benzamide (1) and bis(p-cyanophenyl) terephthalamide (2).