Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China.
Dalton Trans. 2019 Feb 7;48(5):1843-1849. doi: 10.1039/c8dt04397c. Epub 2019 Jan 16.
A water-stable Eu-based metal-organic framework (MOF) with dual-emission luminescence behavior, namely {[Eu(INO)(μ-OH)Cl(HO)]·(NO)·(HO)} (Eu-MOF; HINO = isonicotinic acid N-oxide), was successfully constructed by the solvothermal reaction of Eu ions with the organic ligand HINO. The cationic 3D framework contains microporous channels with accessible Lewis-base sites and NO ions as balanced anions, which all contribute to the selective detection of multifarious analytes. This MOF shows ratiometric detection of acetone, CrO ions, and nitroaromatic compounds (NACs). In particular, it shows great recognition of four NACs in water, representing the first Ln-MOF which can display distinguishing fluorescence phenomena on NACs rather than relying on the quenching effect. Furthermore, this is also the first example of a MOF-sensor for detecting these explosives discriminatively by ratiometric methods. Additionally, the mechanisms for luminescent responses towards different analytes have been discussed in detail.
一种具有双通道发光行为的水稳定的基于铕的金属-有机骨架（MOF），即{[Eu(INO)(μ-OH)Cl(HO)]·(NO)·(HO)}（Eu-MOF；HINO = 异烟酸 N-氧化物），通过 Eu 离子与有机配体 HINO 的溶剂热反应成功构建。阳离子 3D 骨架包含微孔通道，具有可及的路易斯碱位和 NO 离子作为平衡阴离子，这都有助于对各种分析物的选择性检测。该 MOF 对丙酮、CrO 离子和硝基芳香族化合物（NACs）进行了比率检测。特别是，它对水中的四种 NACs 表现出很好的识别能力，这是第一个可以对 NACs 显示出区别荧光现象的 Ln-MOF，而不是依赖于猝灭效应。此外，这也是第一个通过比率方法对这些爆炸物进行区分检测的 MOF 传感器的例子。此外，还详细讨论了对不同分析物的发光响应机制。
