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首页> 外文期刊>Journal of inorganic and organometallic polymers and materials >Targeted Highly-Thermostable Metal-Organic Frameworks Directed by Imidazole: Syntheses, Structures, Thermal Behaviors and Luminescent Properties
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Targeted Highly-Thermostable Metal-Organic Frameworks Directed by Imidazole: Syntheses, Structures, Thermal Behaviors and Luminescent Properties

机译：咪唑定向的高度可靶向的金属有机骨架：合成，结构，热行为和发光性能

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摘要

Three new isostructural 3D lanthanide MOFs (Ln(HBPTC)(H_2O)) (Ln = Tb (1), Pr (2), Nd (3); H_4BPTC = 3,3',4,4'-biphenyltetracarboxylic acid) have been synthesized under hydrothermal conditions using imidazole as a structure-directing agent, and characterized by elemental analyses, IR, thermogravimetric analyses (TGA) and powder X-ray diffraction (PXRD) analyses. Topologically, compounds 1-3 demonstrate an intriguing 3D (6, 6)-connected network with the Schlafli symbol of (4~(10)·6~5)(4~9·6~6); and if the dinuclear (Ln_2) clusters are considered as the single 8-connected nodes, they can be described as a scarcely reported (4, 8)-connected alb net constructed from two intertwining sqp-4 nets. TGA and PXRD analyses reveal that compounds 1-3 exhibit high thermal stability, at least being stable up to 410 ℃. Furthermore, the luminescence studies were performed on compound 1 and its dehydrated phase in the solid state at room temperature. The results demonstrate that compound 1 displays intense green emission, implying its potential application as fluorescence material. And the luminescence of 1 is quenched when removing the coordinated water molecules.
机译：三个新的同构3D镧系元素MOF（Ln（HBPTC）（H_2O））（Ln = Tb（1），Pr（2），Nd（3）; H_4BPTC = 3,3'，4,4'-联苯四甲酸）在水热条件下使用咪唑作为结构导向剂合成，并通过元素分析，红外，热重分析（TGA）和粉末X射线衍射（PXRD）分析进行表征。拓扑上，化合物1-3显示了一个有趣的3D（6，6）连接网络，其Schlafli符号为（4〜（10）·6〜5）（4〜9·6〜6）；如果将双核（Ln_2）群集视为单个8个连接的节点，则可以将它们描述为由两个相互缠绕的sqp-4网络构成的几乎没有报道的（4、8）连接的alb网络。 TGA和PXRD分析表明，化合物1-3具有很高的热稳定性，至少在410℃时是稳定的。此外，在室温下以固态对化合物1及其脱水相进行了发光研究。结果表明，化合物1显示出强烈的绿色发射光，这暗示了其作为荧光材料的潜在应用。当去除配位的水分子时，1的发光被淬灭。

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