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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/80012

    Title: Formation of Columnar Liquid Crystals on the Basis of Unconventional Triazine-Based Dendrimers by the C3-Symmetric Approach
    Authors: Lai, Long-Li;Hsu, Shun-Ju;Hsu, Hui-Chu;Wang, Sheng-Wei;Cheng, Kung-Lung;Chen, Chun-Jung;Wang, Tsai-Hui;Hsu, Hsiu-Fu
    Contributors: 淡江大學化學學系
    Keywords: dendrimers;liquid crystals;molecular mechanics calculations;nitrogen heterocycles
    Date: 2012-05
    Issue Date: 2013-01-16 15:48:05 (UTC+8)
    Publisher: Weinheim: Wiley - V C H Verlag GmbH & Co. KGaA
    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.
    Relation: Chemistry - A European Journal 18(21), pp.6542-6547
    DOI: 10.1002/chem.201103423
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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