博碩士論文 109223058 詳細資訊



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姓名 羅威智(Wei-Chih Lo)  查詢紙本館藏   畢業系所 化學學系
論文名稱 藉由改變imine連接基合成對稱與不對稱桿狀液晶及其性質探討
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摘要(中) 系列一是由含ketone-aldehyde及茶環2號位置有OH的結構與不同 amine之化合物進行schiff base反應成功合成出一系列配未基 1a-c ，並與 boron difluoride (BF2) 形成錯合物 1a-c BF2。由實驗結果發現，化合物 1a 因層與層間存有作用力但由於距離偏長，導至其作用力變小，導致層與層間排列不夠緊密，故化合物 1a皆形成 N 相，而1b (n = 8) 形成 SmA 相其餘皆為SmC；1c 短碳數 (n = 8~12) 皆表現出桿狀液晶 SmC，而1c 長碳數 (n = 14、16) 皆不具有液晶性質。
系列二同樣是是由含ketone-aldehyde結構為核心，與不同對稱的 amine 進行schiff base反應，成功合成出一系列配位基 2a，希望藉由改變中間連接碳數長短，誘導出不同的液晶性質。以由實驗結果發現，隨者中間連接基碳數的不同有 SmA 及SmC 相，並具有奇偶效應化合物 2a (m = 3~7) 皆表現出層狀液晶相，其中連接基為奇數時為單向液晶 SmA；當連接基為偶數時為雙向液晶 SmC。
摘要(英) Two series of mesogenic compounds were prepared and studied in this thesis. All compounds described were characterized via 1H-NMR, 13C-NMR, MS and elemental analysis. The mesophases were studied and investigated by POM, DSC, and the structures of the mesophases were also confirmed by variable temperature X-ray diffraction experiments. In the first series, we succeed to synthesize the ligand 1a-c and their complexes 1a-c BF2. The compound 1a are N phase; compound 1b have SmA and SmC phase; compound 1c is Smc phase, then the compound 1a-c coordination with boron difluoride (BF2) for the metal ligand complexes are formed 1a-c BF2 were nonmesogenic
The second series is also based on the ketone-aldehyde-containing structure as the core, and the schiff base reaction with different symmetrical amines has successfully synthesized a series of ligands 2a. It is hoped that by changing the length of the carbon number of the intermediate connection, different liquid crystal properties can be induced. . According to the experimental results, it is found that there are SmA and SmC phases depending on the carbon number of the intermediate linker, and the compound 2a (m = 3~7) with an odd-even effect all exhibits a lamellar liquid crystal phase, in which the linker is an odd number. Directional liquid crystal SmA; when the connecting group is even, it is bidirectional liquid crystal SmC.
關鍵字(中) ★ 疊圖觀察 關鍵字(英) ★ BF3‧Et2O
論文目次 中文摘要 i
Abstract i
謝誌 iii
第一章 緒論 1
1-1 液晶簡介 2
1-2 液晶分子之基礎架構 3
1-3-1 桿狀液晶 11
1-3-2 盤狀液晶 12
1-4 無機液晶材料之特性 6
1-5 Boron difluoride complex 簡介 14
1-6 研究動機 16
1-6-1 系列一研究動機 16
1-6-2 系列二研究動機 18
第二章 模型分子的設計與合成 19
2-3 實驗流程 19
2-3-1系列一之實驗流程 19
2-3-2系列一之分子設計概念 20
2-4-1系列二之實驗流程 22
2-4-2系列二之之分子設計概念 24
第三章 結果與討論 24
3-1系列一之結構與代號 25
3-1-1 系列一化合物之合成探討 26
3-1-2 系列一化合物 1H NMR 探討 28
3-1-3系列一化合物之偏光紋理圖 31
3-1-4系列一化合物之熱微差掃描分析儀(DSC) 36
3-1-5系列一化合物之熱重量分析結果 41
3-1-6系列一化合物之 Powder X-ray 分析與分子模擬排列 43
3-1-7系列一化合物 1c 之單晶探討 43
3-1-8系列一化合物 1a (n=12) 分子排列探討 51
3-1-9系列一化合物 1a-c 及 1a-c BF2 之光學性質探討 52
3-1-10系列一結論 52
3-2 系列二化合物性質探討 55
3-2-1 系列二之結構與代號 55
3-2-2系列二化合物1H NMR探討 56
3-2-3 系列二化合物之偏光紋理圖 (POM) 57
3-2-4系列二化合物之熱微差掃描分析儀 (DSC) 59
3-2-5系列二化合物之熱重量分析結果 63
3-2-7 系列二化合物之Powder X-ray 分析與分子模擬排列 64
3-2-8系列二化合物之光學性質探討 67
3-2-9系列二結論 68
第四章 實驗部分 69
4-1 實驗藥品 70
4-2 儀器設備 72
4-3 合成詳細步驟 75_Toc74422224
參考文獻 97
附圖 102
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指導教授 林子超 賴重光(Zi-Chao Lin Chong Kuang Lai) 審核日期 2022-8-11
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