Formation of columnar liquid crystals on the basis of unconventional triazine-based dendrimers by the C3-symmetric approach.

Abstract

Two series of unconventional triazine-based dendrimers with C(2) symmetry and C(3) symmetry were prepared. The newly prepared C(3)-symmetrical dendrimers were characterized by (1)H and (13)C NMR spectroscopy, mass spectrometry, and elemental analysis. Differential scanning calorimetry, polarizing microscopy, and powder XRD showed that the C(3)-symmetrical dendrimers display columnar liquid-crystalline phases during thermal treatment, but the C(2)-symmetrical dendrimers were not observed to behave correspondingly. The molecular conformations of C(3)- and C(2)-symmetrical dendrimers were obtained by computer simulation with the MM2 model of the CaChe program in the gas phase. The simulation results reasonably explain the different mesogenicities of C(3)- and C(2)-symmetric dendrimers. This new strategy should be applicable to other types of unconventional dendrimers with rigid frameworks for displaying columnar liquid-crystalline behavior.

DOI: 10.1002/chem.201103423

Cite this paper

@article{Lai2012FormationOC, title={Formation of columnar liquid crystals on the basis of unconventional triazine-based dendrimers by the C3-symmetric approach.}, author={Long-Li Lai and S. J. Hsu and Hui-Chu Hsu and Sheng-Wei Wang and Kung-Lung Cheng and Chun-Jung Chen and T Wang and H F Hsu}, journal={Chemistry}, year={2012}, volume={18 21}, pages={6542-7} }