Issue 20, 2019

Fabrication of a dual-emitting dye-encapsulated metal–organic framework as a stable fluorescent sensor for metal ion 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 the successful encapsulation of fluorescein dye into 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 host–guest energy transfer also occurs. Particularly, depending on the variety of the luminescence intensities of different metal ions incorporated in 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+ ions. The quenching effect coefficient (Ksv) for every metal ion detected is calculated, and the largest Ksv value for Fe3+ ions is determined to be 5072 M−1. Such an encapsulation strategy can be widely adopted to design new dye@MOF composites with multiple luminescent centers for metal cation sensing.

Graphical abstract: Fabrication of a dual-emitting dye-encapsulated metal–organic framework as a stable fluorescent sensor for metal ion detection

Supplementary files

Article information

Article type
Paper
Submitted
15 Mar 2019
Accepted
16 Apr 2019
First published
16 Apr 2019

Dalton Trans., 2019,48, 6794-6799

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

N. Zhang, D. Zhang, J. Zhao and Z. Xia, Dalton Trans., 2019, 48, 6794 DOI: 10.1039/C9DT01125K

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