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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71292

    Title: 含有1,3,4-oxadiazole、isoxazole及pyrazole結構之多雜環桿狀液晶材料
    Authors: 吳冠儀;Wu,Kuan-Yi
    Contributors: 化學學系
    Keywords: 液晶;雜環;heterocyclic;isoxazole;pyrazole;1,3,4-oxadiazole;pyridine
    Date: 2016-07-13
    Issue Date: 2016-10-13 12:40:40 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本篇論文主要在介紹具有雜環之結構液晶。所有化合物經由1H-NMR、13C-NMR與元素分析以鑑定其結構及純度,液晶相性質則是利用偏光顯微鏡(POM)來觀測相種類及熱微差掃描分析儀(DSC) 測量相變化時之溫度與熱焓值,最後以變溫粉末X光繞射儀(XRD) 確認相的種類,並運用單晶結構之討論,來解釋化合物的排列及其作用力。
    ;The 1,3,4-oxadiazoles, isoxazoles and pyrazoles are often considered as one of the most important structures among numerous heterocyclic compounds. These heterocyclic compounds were recently found to exhibit novel mesomorphism due to their varieties in structures and/or known chemistry. Better mesomorphic behavior was attributed to their unsaturation and/or more polarizable nature. All compounds were characterized by 1H, 13C-NMR spectroscopy and elemental analysis. The phase behavior of these mesogenic compounds was characterized and studied by differential scanning calorimeter (DSC) and polarization optical microscope.
    In the first part, two new series of mesogenic bisheterocyclic derivatives containing 1,3,4-oxadiazoles and isoxazoles 1ad were described. A dimeric correlated structure induced by Hbonds was observed in the crystal lattice, which was favorable to the formation of mesophases. All compounds 12 exhibited N/SmC, SmA phases, as expected for linearshaped molecules. All compounds 1 have higher clearing temperatures and wider ranges of mesophases than those of their precursors 2, which might be attributed to have higher dipoles polarized by two heterocyclic rings in 2.
    In the second part, three new series of heterocyclic structures 3ac are prepared, characterized, and their mesomorphic properties investigated. Derivatives 3a exhibited N/ smectic C mesophases; 3b exhibited N/ smectic C mesophases; 3c exhibited smecticA/ C mesophases. The best mesomorphic behavior formed in 3c might be attributed to stronger intermolecular interactions and higher polarization induced in pyrazoles 3c.
    Appears in Collections:[化學研究所] 博碩士論文

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