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Title: | 金屬有機骨架材料之單晶結構利用共軛焦顯微鏡在螢光上的研究與應用 Confocal Luminescence Microscopy of Metal-Organic Framework Single Crystals |
Authors: | Ya-Chien Yu 余雅倩 |
Advisor: | 周必泰(Pi-Tai Chou) |
Keyword: | 金屬有機骨架材料,單晶,共軛焦顯微鏡,檢測器,光激發螢光,螢光, Metal-Organic Framework,Single crystal,Confocal,Sensor,Photoluminescence,Fluorescence, |
Publication Year : | 2009 |
Degree: | 碩士 |
Abstract: | 金屬有機骨架材料(簡稱MOFs)在近年來有顯著的發展,以金屬當中心,然後用共價鍵連接有機配位基團 (主要是O-linker 、N-linker),空間上可無限延伸到1維、二維、三維,不同維度下又可產生多樣的結構,藉由分子內及分子間不同的交互作用改變分子骨架。利用晶體工程 (crystal engineering),在奈米維度下運用多樣的連接器(connector)和鍵結 (linkers)建構出不一樣孔洞材料的骨架。孔洞材料的特性可應用在不同的應用下,例如:小分子的儲備、交換,以及分離等,晶體上的孔洞結構,使得吸附在孔洞的分子和晶體發生動力學轉換,吸脫附的過程,可能會造成晶體構形上的改變以及物理、化學上的變化。
我們主要利用共軛焦顯微鏡研究單晶的金屬有機骨架材料因結構特異性與受光激發後產生的螢光現象。這三個化合物都是以Zn當中心,選用有機發光團當配位基,由於分子間的弱作用力,π–π 作用力和氫鍵等穩定3D結構。利用XRD和TG測量獲得結構和熱穩定的資訊,分子加熱過後發現螢光效率顯著增加,再者,化合物1有很好的吸水性,其特性有保濕應用的潛力,化合物3因為其配位基含有硫原子,對鉛、汞金屬離子等有較好的鍵結能力,且在有機溶液上,也發現己烷會增加螢光效率,故有應用在檢測器上的潛力。 The metal-organic frameworks (MOFs) materials has in recent years advanced extensively, so the materials can afford many and various architectures, which are constructed from a variety of molecular building blocks with different interactions between them. Compounds with backbones constructed from metal ions as connectors and ligands as linkers. Metal–ligand compounds that extend “infinitely” into one, two or three dimensions (1D, 2D or 3D, respectively) via some covalent metal–ligand bondings. Because the porous materials have various properties and potential, contain there are many applications, such as separation, heterogeneous catalysis, and gas storage. The adsorption and desorption of guest molecules onto the solid surface also plays an essential role in determining the properties of porous compounds, for instance photophysics, conformation, and even stability. Our studying is based on the luminescence using confocal microscope owing to transforming the architectures. Some weaker non-covalent interactions, such as hydrogen bonding or π–π stacking are very important for the packing structures of the one- dimensional chains, two-dimensional nets and three-dimensional frameworks. X-ray powder diffraction (XRPD) and thermogravimetric (TG) measurements are commonly used to analyze the stability of structure. These compounds which we study have specific properties of photoluminescence, the enhancement of quantum efficiency after heating. Compound 1 may thus find their potential application in water sensor. Moreover, the water adsorption property may find their potential application in moisturizing. These results exemplify a unique model that the structural constraints acting on the orientation of water by its surrounding and vice versa can be very significant. Compound 3 has functionalized groups that may have potential on organic solvents and metal ions. We found out that cyclohexane or lead ions exist in the structure, the quantum efficiency of fluorescence will be enhanced. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/26010 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 化學系 |
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