小分子離子型液晶性質探討及其應用在動態散射之結果

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/73955

Title:	小分子離子型液晶性質探討及其應用在動態散射之結果
Authors:	吳肇軒;Wu, Chao-Hsuan
Contributors:	化學學系
Keywords:	液晶
Date:	2017-07-12
Issue Date:	2017-10-27 12:56:21 (UTC+8)
Publisher:	國立中央大學
Abstract:	近年來，離子液體廣泛被發展，但大部分仍使用imidazolium作為陽離子，因此我們嘗試合成出新結構的陽離子，使用benzenaminium作為陽離子，並探討其液晶行為的表現。在系列一中，探討不同陰離子(Cl-、BF4-、PF6-)及不同數量的側鏈基對液晶相所造成的影響，其中1a 比 1b 及1c具有更廣的桿狀液晶相，化合物 2a、2b、2c及3a 可以觀察到盤狀液晶的性質，而3b及3c因為其陰離子立體障礙過大而沒有液晶相，4a 因為缺乏適當軟端而沒有液晶相的產生。在系列二中，藉由改變不同側鏈基數目以及不同陰離子的碳數來對其液晶性質作探討，其中1d及4d具有SmA液晶相，並藉由XRD來模擬出其排列，而2d及3d具有Col液晶相，並以1e作為動態散射(dynamic scattering) 之中的離子雜質來對比其他離子雜質之散射態維持成果探討。所有化合物經由1H-NMR、13C-NMR、元素分析以及質譜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)來觀測相種類及熱差式掃描分析儀(DSC)測量相變化時之溫度與熱焓值。 ;In recent years, a number of cation types for ionic liquids have been developed, but still by far the most commonly used are imidazolium cations. As a consequence, most of the ionic liquid crystals studied so far are based on imidazolium as well. For those reasons, we try to design a series of new structures, containing benzenaminium, which exhibit the mesomorphic properties In this two series , new compounds were prepared and their mesomorphic properties were investigated. All compounds were characterized by 1H and 13C-NMR spectroscopy. The phase behaviors of these mesogenic compounds were characterized and studied by polarized optical microscope (POM) and differential scanning calorimeter (DSC). In series I, ten new series of the structures containing benzenaminium with different types of anions (chloride ,tetrafluoroborate , hexafluorophosphate ). Compounds 1a exhibits wider range of calamitic phases than compound 1b and 1c . Compounds 2a, 2b, 2c and 3a exhibit columnar mesogen behaviour. Compounds 3b and 3c did not exhibit liquid crystal behaviour due to their bulkier counterions. Compounds 4a did not exhibit liquid crystal behaviour due to the bulkier cation. In series II, eleven new series of the structures containing benzenaminium were prepared. Compounds 1d and 4d exhibits calamitic phases. Compounds 2d and 3d (n = 8 、12) exhibit columnar mesogen behaviour. Compounds 1e can be used for ionic dopant in the dynamic scattering experiment.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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