Hydrogen-bonding stabilized columnar mesophases in hexasubstituted triphenylene 2,3-Dicarboxamides

•Mesogenic triphenylene 2,3-dicarboxamides were synthesized and characterized.•Having excellent thermally stability.•Having high clearing temperatures over 150 °C and exhibiting wide mesophase ranges.•Dependence of the mesomorphic behaviors on the lengths of peripheral alkoxy and N-alkyl chains.•One dicarboxamide exhibits good gelation property in toluene.