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Formation of Columnar Liquid Crystals on the Basis of Unconventional Triazine-Based Dendrimers by the C3-Symmetric Approach

  1. Prof. Dr. Long-Li Lai1,*,
  2. Shun-Ju Hsu1,
  3. Hui-Chu Hsu1,
  4. Sheng-Wei Wang1,
  5. Dr. Kung-Lung Cheng2,
  6. Chun-Jung Chen3,
  7. Tsai-Hui Wang4,
  8. Prof. Dr. Hsiu-Fu Hsu4,*

Article first published online: 4 APR 2012

DOI: 10.1002/chem.201103423

Issue

Chemistry - A European Journal

Chemistry - A European Journal

Volume 18, Issue 21, pages 6542–6547, May 21, 2012

Additional Information

How to Cite

Lai, L.-L., Hsu, S.-J., Hsu, H.-C., Wang, S.-W., Cheng, K.-L., Chen, C.-J., Wang, T.-H. and Hsu, H.-F. (2012), Formation of Columnar Liquid Crystals on the Basis of Unconventional Triazine-Based Dendrimers by the C3-Symmetric Approach. Chem. Eur. J., 18: 6542–6547. doi: 10.1002/chem.201103423

Author Information

  1. 1

    Department of Applied Chemistry, National Chi Nan University, No.1 University Rd., Puli, Nantou (Taiwan), Fax: (+886) 49-2917956

  2. 2

    Material and Chemical Research Laboratories, Industrial Research Institute, Hsinchu (Taiwan)

  3. 3

    Department of Chemistry, National Central University, Jhongli (Taiwan)

  4. 4

    Department of Chemistry, Tamkang University, Tamsui (Taiwan)

*Department of Applied Chemistry, National Chi Nan University, No.1 University Rd., Puli, Nantou (Taiwan), Fax: (+886) 49-2917956

Publication History

  1. Issue published online: 15 MAY 2012
  2. Article first published online: 4 APR 2012
  3. Manuscript Received: 31 OCT 2011

Funded by

  • National Science Council. Grant Numbers: NSC 98-2119-M-260-003, NSC 100-2113-M-260-006-MY2

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Keywords:

  • dendrimers;
  • liquid crystals;
  • molecular mechanics calculations;
  • nitrogen heterocycles

Abstract

Two series of unconventional triazine-based dendrimers with C2 symmetry and C3 symmetry were prepared. The newly prepared C3-symmetrical dendrimers were characterized by 1H and 13C NMR spectroscopy, mass spectrometry, and elemental analysis. Differential scanning calorimetry, polarizing microscopy, and powder XRD showed that the C3-symmetrical dendrimers display columnar liquid-crystalline phases during thermal treatment, but the C2-symmetrical dendrimers were not observed to behave correspondingly. The molecular conformations of C3- and C2-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 C3- and C2-symmetric dendrimers. This new strategy should be applicable to other types of unconventional dendrimers with rigid frameworks for displaying columnar liquid-crystalline behavior.

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