Synthesis of New Nondisk-Shaped Thermotropic Liquid Crystalline Compounds Showing a Rectangular Columnar Mesophase

Abstract

Linear- and polycatenar-type compounds possessing a cabazole moiety as a head group, linked to the trialkoxy terminal tails via a linear aromatic chain have been designed and synthesized. These compounds exhibit a liquid crystalline rectangular columnar phase. The mesomorphic nature was determined by polarizing optical microscopy (POM) and differential scanning calorimetry (DSC) in combination with powder XRD.

Keywords:

• Carbazole
• differential scanning calorimetry
• polarizing optical microscopy
• rectangular columnar phase
• Schiff's base
• X-ray diffraction

Acknowledgments

We thank the Department of Science and Technology (DST, New Delhi) for financial assistance. Nirupam De is thankful to the University Grants Commission (UGC, New Delhi) for his fellowship.