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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/107633

    Title: Low-Melting Biaxial Nematics from Unsymmetrical Cross-like 1,2,4,5-Tetra-substituted Benzene
    Authors: Hsu, Hsiu-Fu
    Keywords: liquid crystals
    Date: 2016-07-31
    Issue Date: 2016-10-05 02:10:52 (UTC+8)
    Abstract: The theoretical prediction[1] of biaxial nematics (Nb) was proposed more than 20 years ago, which have been suggested promising for significant improvements of liquid crystal displays response time and viewing-angle characteristics.[2] With shape biaxiality, board-like nematogens were originally proposed to lead to the Nb phase and the first biaxial nematic phase from cross-like mesogens was not succeeded until 2012.[3] In that report, the theoretically predicted optimum length-breadth-width ratio for maximizing shape biaxiality has been practiced by the successful synthesis of cross-like 1,2,4,5-tetrasubstituted benzene (1) which achieved enantiomeric nematic phase behaviours. Various measurements were conducted for its biaxiality investigations. Though with a wide-temperature-range enantiomeric nematic phase, compound 1 still suffers from high melting temperatures. Herein, with similar length-breadth-width ratio, newly designed unsymmetrical cross-like compounds (2) are synthesized to afford low melting temperatures for facile biaxiality investigations (Figure 1).
    Relation: Conference abstract book
    Appears in Collections:[化學學系暨研究所] 會議論文

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