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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/25229

    Title: Star-Shaped Mesogens of Triazine-Based Dendrons and Dendrimers as Unconventional Columnar Liquid Crystals
    Authors: 徐秀福;Hsu, Hsiu-fu;Lai, Long-li;Lee, Cheng-hua;Wang, Ling-yung;Cheng, Kung-lung
    Contributors: 淡江大學化學學系
    Date: 2008-01-18
    Issue Date: 2009-12-01
    Publisher: Washington: American Chemical Society
    Abstract: Dendrons G(n)-Cl and G(n)-NH (n = 2-4) and novel dendrimers G(n)-N similar to N-G(n) (n = 2-4) based on triazine and piperazine units were efficiently prepared in good yields without employing the protection and deprotection processes and are fully characterized by H-1 NMR and C-13 NMR spectroscopies, elemental analysis, and mass spectroscopy. These compounds are transparent and possess good thermal stability. G(4)-Cl shows a monotropic columnar phase in a narrow range with a coexisting crystalline phase. Dendron G(4)-NH shows a rectangular column-phase, and dendrimer G(4)-N similar to N-G(4) exhibits a monotropic hexagonal columnar phase. These identifications were supported by the polarizing optical scope and powder XRD studies.
    Relation: Journal of Organic Chemistry 73(2), pp.485-490
    DOI: 10.1021/jo701990w
    Appears in Collections:[化學學系暨研究所] 期刊論文

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