科研之友
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摘要
A microporous europium metal-organic framework (Eu-MOF), namely, {[Eu-3(bpydb)(3)(HCOO)(OH)(2)-( DMF)]center dot 3DMF center dot 2H(2)O}(n) (1) with asymmetric trinuclear metal clusters extended by 4,4'-(4,4'-bipyridine-2,6-diyl) dibenzoic acid has been synthesized via the solvothermal method. PXRD of 1 confirms that it possesses excellent water stability and pH stability. The photo-luminescence properties of 1 exhibit effective recognition of Cr2O72-, MnO4-, and Cr3+ ions and SDBS. Furthermore, a wide linear range, high quenching constant and a low detection limit reveal that 1 can potentially act as a luminescence-based sensor for quantitative and highly sensitive detection of Cr2O72-, MnO4-, and Cr3+ ions as well as SDBS in aqueous solutions. To the best of our knowledge, the detection limit of 1 is the lowest value reported for Ln-MOF-based luminescent sensors to detect Cr2O72- ions (0.5 mu M) in aqueous solutions. The use of a rare earth fluorescent probe for detecting MnO4- ions is not common. It is the first time that Ln-MOF as a fluorescence probe is used for detecting SDBS. Moreover, fluorescent-based test papers of 1 have also been prepared, which can be helpful to develop visual detection for Cr2O72-, MnO4-, and Cr3+ ions as well as SDBS in daily applications.
