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

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/89175

Title:	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
Authors:	羅威智;Lo, Wei-Chih
Contributors:	化學學系
Keywords:	疊圖觀察;BF3‧Et2O
Date:	2022-08-11
Issue Date:	2022-10-04 11:00:19 (UTC+8)
Publisher:	國立中央大學
Abstract:	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。 ;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.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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