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Fabrication of dual-emitting dye-encapsulated metal–organic framework as a stable fluorescent sensor for metal ions detection

Abstract

Dye-loaded metal organic frameworks (MOFs) are regarded as one of the most fascinating luminescent materials for selective chemical sensing. Herein, a facile two-step synthesis procedure is reported for successful encapsulation of fluorescein dye into a porous zinc-adenine metal-organic framework (bio-MOF-1) crystals, and thus the aggregation-caused quenching of dye molecules can be eliminated in the confined MOF structure to further create dual emission centers. The as-prepared solid state fluorescein@bio-MOF-1 composite exhibits both the characteristic emissions of the fluorescein dye and bio-MOF-1, and the host-guest energy transfer also occurs. Particularly, depending on the variety of the luminescence intensities of different metal ions incorporated fluorescein@bio-MOF-1, such a host-guest system could be used for high-sensitive sensing of metal cations, especially for the drastic luminescence quenching of Fe3+ ion. The quenching effect coefficient (Ksv) for every metal ion detected is calculated, and the largest Ksv value for Fe3+ ion is determined to be 5072 M-1. Such an encapsulation strategy can be widely adopted to design new dye@MOFs composites with multiple luminescent centers for metal cations sensing.

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Publication details

The article was received on 15 Mar 2019, accepted on 16 Apr 2019 and first published on 16 Apr 2019


Article type: Paper
DOI: 10.1039/C9DT01125K
Citation: Dalton Trans., 2019, Accepted Manuscript

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    Fabrication of dual-emitting dye-encapsulated metal–organic framework as a stable fluorescent sensor for metal ions detection

    N. Zhang, D. Zhang, J. Zhao and Z. Xia, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT01125K

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