含氮氧以及雙氧原子之硼錯合物之液晶性質探討

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題名:	含氮氧以及雙氧原子之硼錯合物之液晶性質探討
作者:	蔡逸宏;CAI, Yi-Hong
貢獻者:	化學學系
關鍵詞:	桿狀液晶;盤狀液晶;硼氟化合物
日期:	2020-07-23
上傳時間:	2020-09-02 15:10:49 (UTC+8)
出版者:	國立中央大學
摘要:	在系列一中使用過去實驗室所合成過之烯胺結構 (enamine) 作為配位基2a 和 2b，並與boron difluoride (BF2)形成硼錯合物1a 和 1b，而其中1a 和 1b 皆有成功誘導出桿狀液晶的性質，並且由化合物1a (n = 8)的單晶結構可得知，中心的硼原子為四面體，兩側苯環與硼的配位結構環之兩面角分別為5.750和3.298，分子較趨近於平面，利於液晶相之生成。化合物1b的最大吸收波長以及最大放光波長皆比1a紅位移，而1a 和 1b系列之硼錯合物皆有AIE (Aggregation induced emission)之性質，在液晶領域的應用上，期望此類化合物在未來可做為一良好的發光材料。第二系列中，成功合成並以tetraketonates作為配位基的2c-2e，將之與boron difluoride (BF2)形成硼錯合物1c-1e，其中1c並不具有液晶之性質，但是藉由增加兩側苯環上的烷氧鏈數目，化合物1d 和 1e皆有成功誘導出盤狀液晶相，而在紫外/可見光光譜以及螢光光譜的測定結果中，可發現硼錯合物的放光波長皆比配位基的放光波長來得紅位移，硼錯合物的螢光放光波長範圍在溶液態為λmax = 527-628 nm，而固態螢光放光範圍為λmax = 668-690 nm，在固態螢光光譜中化合物1d 和 1e之放光波長皆比在溶液中紅位移，此為J-aggregate堆疊所致。 ;In the first part, two new families of borondifluoride complexes 1a and 1b derived from eneamines 2a and 2b were reported, and their mesomorphic and optical properties were also investigated. One single crystal and molecular structure of nonmesogenic BF2 complex 1a (n = 8) was resolved and the geometry of the central boron atom was tetrahedron. The dihedral angles of the benzene ring and the boron coordination ring on both sides are 5.750 and 3.298 respectively. The molecules tend to be closer to the plane, which is conducive to the formation of liquid crystal phase. The optical property of the boron complexes was dependent on their molecular structures, The maximum absorption and the maximum luminescent emission of the compound 1b were red-shifted compared to the compound 1a. The 1a and 1b have the property of AIE (Aggregation-induced emission), and it can be a protential material of luminescence in the future. In the second part, three new series of bis-(boron difluoride) complexes 1c-1e derived from substituted tetraketonates 2c-2e were reported, and their mesomorphic and optical properties were also investigated. Results appeared that bis(BF2) complexes 1c were nonmesogenic. The 1d and 1e exhibited enantiotropic columnar mesophases. Bis(BF2) complexes 1c-1e (n = 12) possess a pronounced yellow－orange emission in solution at room temperature and possess a pronounced red emission in solid at room temperature. in the solid state (λmax = 668-690 nm) were red-shifted compared to in the solution (λmax = 527-628 nm) because of the J-aggregate.
顯示於類別:	[化學研究所] 博碩士論文

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