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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/24935


    Title: Discotic mesogens of 1,3,5-TRIS(4-(3,4,5-trialkyloxy-benzoyloxy)benzoyloxy) benzene homologues
    Authors: 余良杰;Yu, Liang-jye;Cho, C. C.
    Contributors: 淡江大學化學學系
    Date: 2007-03
    Issue Date: 2009-12-01
    Publisher: Taylor & Francis
    Abstract: Discotic mesogens were synthesized by esterification of 1,3,5-tris(4-hydroxy- benzoyloxy)benzene with 3,4,5-trialkyloxybenzoic acids in DCC/DMAP/THF. These derivatives were studied by optical microscopy, differential scanning calorimetry and powder X-ray diffractometry. Optically uniaxially negative columnar phases were observed for derivatives having dodecyloxy and hexadecyloxy chains. Hexagonal packing of columns was observed from the results of X-ray diffraction. However, the diameter of the column is less than the molecular dimension indicating the interdigitations of peripheral chains of the neighboring columns.
    Relation: Molecular crystals and liquid crystals 411, pp.313-318
    DOI: 10.1080/15421400490435314
    Appears in Collections:[化學學系暨研究所] 期刊論文

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