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  • Title: A water-stable EuIII-based MOF as a dual-emission luminescent sensor for discriminative detection of nitroaromatic pollutants.
    Author: Zhang XJ, Su FZ, Chen DM, Peng Y, Guo WY, Liu CS, Du M.
    Journal: Dalton Trans; 2019 Feb 07; 48(5):1843-1849. PubMed ID: 30648716.
    Abstract:
    A water-stable EuIII-based metal-organic framework (MOF) with dual-emission luminescence behavior, namely {[Eu4(INO)5(μ3-OH)2Cl4(H2O)]·(NO3)·(H2O)5}n (Eu-MOF; HINO = isonicotinic acid N-oxide), was successfully constructed by the solvothermal reaction of Eu3+ ions with the organic ligand HINO. The cationic 3D framework contains microporous channels with accessible Lewis-base sites and NO3- ions as balanced anions, which all contribute to the selective detection of multifarious analytes. This MOF shows ratiometric detection of acetone, Cr2O72- ions, and nitroaromatic compounds (NACs). In particular, it shows great recognition of four NACs in water, representing the first LnIII-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.
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