含雙氧原子之硼錯合物的合成及其液晶性質探討;Board-Like Mesogenic Bis(borondifluoride) Complexes Derived from Tetraketonates

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/83223

Title:	含雙氧原子之硼錯合物的合成及其液晶性質探討;Board-Like Mesogenic Bis(borondifluoride) Complexes Derived from Tetraketonates
Authors:	劉奕辰;Liu, Yi-Chen
Contributors:	化學學系
Keywords:	液晶;硼錯合物;liquid crystal;boron complex
Date:	2020-07-23
Issue Date:	2020-09-02 15:10:59 (UTC+8)
Publisher:	國立中央大學
Abstract:	在本研究中成功合成出以萘環及軟端為中心核連接β-diketonate的為配位基2a-2d，並與boron diflouride (BF2)配位來形成錯合物1a-1d。在本研究中，僅有兩邊各兩條鏈之配位基2b及錯合物1b, 1d具有液晶相，推測是由於兩邊各一條鏈的配位基及錯合物其給予的擾動性不足夠，造成中心核堆疊得太過整齊，使其僅能形成結晶相。再經偏光紋理圖與X光粉末繞射實驗結果判定為六角筒型(Columnar hexagonal, Colh)之盤狀液晶，而藉由從熱微差掃描儀得到精準的相轉移溫度後，發現1b化合物在碳鏈長度為12時有最寬廣的液晶相範圍，而1d化合物則是隨著碳鏈長度的拉長而使液晶相範圍逐漸增寬。再經由紫外/可見光譜儀及螢光放射儀的測量後可以發現，與BF2進行配位後，使donor acceptor charge transfer effect增強，造成錯合物之放光波長均較原先配位基來得紅移，且1b化合物的放光強度相較配位基而言有明顯的增強。;In this resrarch, naphthalene and alkanes linked between two β-diketonate, a new central core, were synthesized and their mesomorphic and optical properties were investigated. Among the compounds, only 1b, 1d and 2b have shown liquid crystal properties, because of their asymmetry and the dispersive force form the four terminal alkyl chains. Then we characterized its mesoproperties by polarizing optical microscopy and powder x-ray diffraction, exhibit columnar hexagonal mesophase. Checked by precise phase transition temperature, 1b(n = 12) showed wide phase transition temperature, and as the terminal alkyl chains more length, complexes 1d phase transition temperature becomes wider. Them we investigated luminescence properties by UV-Vis spectrum and PL spectrum. After coordinated with BF2, the complexes’ em become red shift due to the increase of onor acceptor charge transfer effect. By the way, 1b’s quantum yield are obviously stronger than 2b.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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