Crystal and Liquid-Crystal Structure of a Disk-like Molecule Triphenylene Hexa-n-Dodecanoate

Abstract

A disk-like molecule triphenylene 2,3,6,7,10,11-hexa-n-dodecanoate is known for its three columnar mesophases D 0 , D 1 , D 2 in the order of ascending temperature. X-ray diagrams obtained from oriented specimens show that the plane of triphenylene core of the molecule is not perpendicular to the columnar axis in both D 0 and D 1 mesophases as well as in the crystalline phase; the hydrocarbon side chains are in a relatively regular array throughout these phases except in the D 2 phase. The two-dimensional lattice parameters determined for the array of the columns are different from those reported previously.