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Highly thermostable lanthanide metal-organic frameworks exhibiting unique selectivity for nitro explosives

机译:高稳定性的镧系金属有机骨架对硝基炸药具有独特的选择性

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摘要

Three isostructural 3D metal-organic frameworks [Ln(L)(1.5)(DEF)](n) (Ln = Gd (1), Eu (2), Tb (3), H2L = 9,9-diethylfluorene-2,7-dicarboxylic acid) have been solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction. The main framework of compounds 1-3 show high thermal stability to 400 degrees C but with a distortion or shrinking of the crystal lattice between 200 degrees C and 250 degrees C. The high red emission intensity and the microporous instinct of the solvent-free [Eu(L)(1.5)](n) (2a) indicate that it can be potentially used as luminescent sensor. It was then applied in the detection of organic solvent molecules. Notably, it exhibits high sensitivity for 2,4,6-trinitrophenol (TNP) with K-sv constant 6.24 x 10(4) M-1 through luminescence quenching experiments.
机译:三个同构3D金属-有机骨架[Ln(L)(1.5)(DEF)](n)(Ln = Gd(1),Eu(2),Tb(3),H2L = 9,9-diethylfluorene-2,溶剂热合成并通过单晶X射线衍射对其结构进行表征。化合物1-3的主要骨架在400摄氏度下显示出高热稳定性,但在200摄氏度至250摄氏度之间晶格发生扭曲或收缩。红色发光强度高且无溶剂的微孔本能[ Eu(L)(1.5)](n)(2a)表示它可以潜在地用作发光传感器。然后将其应用于有机溶剂分子的检测。值得注意的是,它通过发光猝灭实验对K-sv常数为6.24 x 10(4)M-1的2,4,6-三硝基苯酚(TNP)表现出很高的敏感性。

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