Mesomorphism of the homologues of the symmetrical and asymmetrical triphenylene compounds substituted by side fluoroalkylated chains

Abstract

Two types of the homologues (symmetrical and asymmetrical in the rotational symmetry) as novel triphenylene compounds possessing fluoroalkyl and alkyl side chains in an alternative way were synthesized. X-ray diffraction and DSC measurements with texture observations by polarized microscope revealed that these homologues show a hexagonal columnar (Colh) mesophase with a different manner of the intracolumnar order from each other. The thermal stability of these Colh phases is higher than that of the corresponding fluoroalkyloxytriphenylenes and alkyloxytriphenylenes.