The mesophase behaviour of 9-phenylcarbazole derivatives with five, six and seven alkyl chains attached to the aromatic core is described. The compound with seven alkyl chains displays liquid crystalline behaviour at room temparature, while those with five and six nine-carbon alkyl chains present a columnar liquid crystal phase at room temperature when doped with TNF, as confirmed by optical polarizing microscopy, differential scanning calorimetry and X-ray diffraction.