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|Title: ||以1,3,4-thiadiazole為架構之無機盤狀液晶材料;A novel discotic liquid crystal based on 1,3,4-thiadiazole|
|Authors: ||黃啟舜;Chi-Shuen Huang|
|Keywords: ||盤狀液晶;discotic liquid crystal|
|Issue Date: ||2009-09-22 10:15:31 (UTC+8)|
|Abstract: ||系列一：設計並合成以bis-(1,3,4-thiadiazole)為主結構之配位基，再接上 PdCl2 或 PdBr2 成為金屬液晶錯合物。利用熱差式分析儀(DSC)、偏光顯微鏡(POM)及粉末 X 光繞射(XRD)鑑定其結構，發現液晶相與側鏈基數目、碳數、金屬鍵結方式與立體障礙都會影響液晶相之範圍。由於 Thiadiazole 的配位基發藍光，有潛力成為發光材料，因此除了液晶行為的探討，我們更進一步利用 UV-Vis 可見光譜、 PL 放射光譜研究其光譜及量子產率。 系列二：系列一之延伸，在配位基中加入 OH 官能基，試圖利用OH官能基與金屬的不同配位方式，產生新的液晶相。由 FT-IR及 NMR 實驗確認配位基中存在著氫鍵，並一步研究 ligand中氫鍵對液晶相之影響，與 PL 光譜的 excited state intramolecular proton transfer(ESIPT) 現象。此系列的金屬鍵結方式與系列一不同，但同樣皆為Colh的盤狀排列，因此我們希望藉由體積量測方法找出鍵結方式對液晶分子排列的影響，並試圖找出其排列方式與規則度。 In the first series, the preparation, characterization and mesomorphic properties of palladium chloride and palladium bromide complexes derived from bis-(1,3,4-thiadiazole) derivatives are described. These compounds with a different number of alkoxy side chain exhibited various mesophases, which were studied and investigated by differential scanning calorimeter (DSC), polarized optical microscopy (POM) and powder X-ray diffraction (XRD). The formation of mesophases was found to be sensitive to the number of the alkoxy side chain, carbon length of the side chains, stereo geometry, and the coordination of metal centers. As light emittng materials, the physical properties by UV-Vis spectrophotometer, and photoluminescence (PL) were also studied and discussed. In the second series, a new type of metallomesogenic complexes structurally similar to the first series with a OH group added was prepared ane studied. Theses metal complexes were coordinated in different geometries from the first series. All compounds in the series existing intramolecular hydrogen bond and an ESIPT behavior, were investigated by FT-IR and UV-PL. In addition, in order to better understand the molecular arrangement in columnar mesophases, the molecular volume dilatomery and other parameters were also measured and discussed.|
|Appears in Collections:||[化學研究所] 博碩士論文|
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