Liquid Crystalline Compounds Consisting of Two Mesogens in Twisted Parallel (2)

Abstract

Two mesogens were connected with O=C-N(R)-C-O to give a twisted arrangement of the mesogens because of the electrostatic repulsion between the two carbonyl-oxygen atoms. In this structure, the excluded volume effect must become the minimum to give the liquid crystallinity. (RO-C6H4-COO-C6H4-CC-C6H4-CO)2NR' and (RO-C6H4'COO-C6H4-C2C2-C6H4-CO)2NR' (R=n-alkyl) were synthesized and those liquid crystal phases were obtained. We report the molecular structures and the properties.