On–Off Ratiometric Fluorescence Europium(III) Metal–Organic Framework for Quantitative Detection of the Inflammatory Marker Neopterin

Benefiting from the unique photoluminescence behavior of the lanthanide­(III) ions and organic ligands, a lanthanide­(III) metal–organic framework (Ln-MOF) material can simultaneously demonstrate photoluminescence of lanthanide­(III) cations and organic molecules and endow its superior applications...

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Veröffentlicht in:Inorganic chemistry 2024-03, Vol.63 (10), p.4697-4706
Hauptverfasser: Hong, Chao, Li, Ling, Zou, Ji-Yong, You, Sheng-Yong, Wang, Er−Li, Zhang, Li, Liu, Yue-Wei, Huang, You-Lin
Format: Artikel
Sprache:eng
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Zusammenfassung:Benefiting from the unique photoluminescence behavior of the lanthanide­(III) ions and organic ligands, a lanthanide­(III) metal–organic framework (Ln-MOF) material can simultaneously demonstrate photoluminescence of lanthanide­(III) cations and organic molecules and endow its superior applications of fluorescence sensing behaviors. Herein, we present a europium­(III) MOF material {[Eu2(BPTA)·(CH3COO)2·3DMA]·0.5DMA·3H2O} n (1) (where H4BPTA is 3,3′,5,5′-biphenyltetracarboxylic acid) for photoluminescence performance of quantitatively sensing the inflammatory marker neopterin (Neo). The obtained 1 comprises Eu2(COO)4 paddlewheel secondary building units, which could be bridged by BPTA4– ligands to extend a 2D framework. The fluorescence titration indicates 1 can achieve simultaneous fluorescence behavior of Eu3+ ions and Neo via on–off ratiometric effects and thus could be exploited as the ratiometric fluorescence sensor matrix. Such a fluorescence phenomenon of 1 as a ratiometric sensor for quantitative detection of Neo via an on–off ratiometric effect is never observed in MOF chemistry. Moreover, naked-eye visible color variations of the fluorescence for 1 could be observed from red to blue with increasing concentrations of Neo, confirmed by fluorescent test strips as well as portable fluorescent hydrogels. And 1 also shows a low detection limit of 15.11 nM. A synergetic contribution of the competitive absorption, fluorescence resonance energy-transfer, and photoinduced electron-transfer mechanisms between Neo and the framework of 1 realizes the on–off ratiometric fluorescence behavior for Neo detection, supported by the UV–vis spectral overlap experiment and DFT calculations.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.3c04357