We take the electron deficient heterocyclic hexaazatriphenylene (HAT) as our central core and readily synthesized by the condensation of hexaketo- cyclohexane with the respective 1,2-bis-alk-oxy-4,5-diaminobenzene. We use the polarised optical microscopy (POM) and differential scanning calorimetry (DSC) to study the mesophase range.These mesophases are identified as columnar phases by diffraction (XRD).

The dibenzo[a,c]phenazine dimers with the branched alkoxy chain of disc were synthesized simplely. We now show on the synthesis of this series of compounds which were found to exhibit mesomorphism as determined by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). These materials showed polymeso- morphism and glass formation. In our investigations, we also observed that the effects of branched chains on dibenzo[a,c]phenazine enhanced columnar liquid crystal phase stability indeed.