3a04 FT-IR Study on Phase Transition Behavior of Bicontinuous Cubic Liquid Crystalline Compounds

Abstract

Thermotropic hydrogen-bonded cubic mesogens, 4〓31-n-alkoxy-3〓31-nitrobiphenyl-4-carboxylic acid (ANBC-n, where n is the number of carbon atoms in the alkyl chain) and 1,2-bis(4〓31-n-alkoxybenzoyl)hydrazine (BABH-n), supramolecularly organize into two types of bicontinuous cubic (Ia3d and Im3m types) and smectic phases. In the present work, changes in the intermolecular interactions at each portion, i. e. flexible alkyl and rigid core parts, in these compounds at the phase transitions were directly measured using the temperature-variable FT-IR measurement.