Effect of Heteroatoms in the Side Chains of Disklike Molecules on the Formation of Discotic Liquid Crystalline Phases

Article abstract of DOI:10.1021/jo00021a020

Incorporation of oxygen and sulfur atoms into the side chains of discotic liquid crystals generally results in a depression of both the crystal to discotic and discotic to isotropic transition temperatures relative to the n-alkyl analogue.In contrast, replacement of the methylenes in side-chain positions 4 of 2,3,6,7,10,11-hexakis(alkanoyloxy)triphenylenes increases the clearing (M-I) temperature from 120 to 200 deg C.This effect is specific for sulfur substitution, to the triphenylene series, and to the 4-position.It is not expected, based on a simple model for discotic-phase formation.