New mixed tail triphenylene discotic liquid crystals

Abstract

Some new mixed tail triphenylene discotic liquid crystals having three alkoxy and three alkanoyloxy chains have been prepared and characterized. Effects of unsymmetrical substitution by virtue of different alkyl chains in the periphery and their attachment to the core were studied. The synthesis was carried out by esterification of the symmetrical and unsymmetrical trihydroxy-tripentyloxytriphenylenes with various acid chlorides. All the mixed tail triphenylene derivatives stabilize the mesophase range compared to the hexaether or hcxaester derivatives of triphenylene. Nonsymmetric isomers have a broader mesophase range than the symmetric isomers.