Liquid crystals with rod-disc compatibility: Influence of the methylene spacer length on the LC phase for linked with ether groups azobenzene-triphenylene derivative.

Abstract

A novel mesogen, a triphenylene derivative possessing six alkoxyazobenzenes at the periphery linked by ester groups exhibits bimesomorphism of calamitic and discotic mesophism with its shape change in anisotropy. The linkage group between triphenylene and azobenzene would take an important role in the occurrence of such a bimesomorphism. In this communication, a few derivatives of which linkage group is ether one instead of ester were studied on their mesomorphis to reveal the linkage groups take an critical role for such a bimesomorphism. Also the ether linkage leads to a drastic decrease of clearing point.