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Issue 10, 2018
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Highly selective sensing of Fe3+ by an anionic metal–organic framework containing uncoordinated nitrogen and carboxylate oxygen sites

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Abstract

Fast and highly selective detection of trace amounts of metal ions has become one of the most urgent issues concerning public security and living systems. However, developing a highly efficient fluorescent sensor for metal ions still remains a great challenge. Metal–organic frameworks (MOFs) are a promising class of porous fluorescent sensors towards ion detection. Herein, the anionic MOF FJI-C8 based on the π-conjugated aromatic ligand H6TDPAT (2,4,6-tris(3,5-dicarboxylphenylamino)-1,3,5-triazine) containing uncoordinated nitrogen and carboxylate oxygen atoms was chosen as highly efficient sensor for selective detection of Fe3+. Due to the strong interaction between Fe3+ and Lewis base sites (uncoordinated nitrogen and carboxylate oxygen atoms), the high overlap between the emission spectrum of the anionic FJI-C8 and the absorption spectrum of Fe3+, and the good overlap of the excitation spectrum of the host material FJI-C8 with the absorption spectrum of Fe3+, FJI-C8 exhibited a high sensitivity (0.0233 mM of Fe3+) and extra selectivity (Ksv = 8245 M−1) for the rapid detection (less than 30 s) of Fe3+ with low usage (0.04 mg mL−1 of FJI-C8 suspension). To the best of our knowledge, this is the first example of a luminescent MOF chemosensor based on a trefoil ligand with the highest density of uncoordinated N and carboxylate O atoms for the highly selective detection of Fe3+. It is also crucial to note that this is a first time detection of Fe3+ using both FJI-C8 suspension and solid after filtration, and the results indicate that the detection of Fe3+ using the FJI-C8 suspension is better. This study will pave the way for designing luminescent MOF chemosensors for the detection of Fe3+ ion.

Graphical abstract: Highly selective sensing of Fe3+ by an anionic metal–organic framework containing uncoordinated nitrogen and carboxylate oxygen sites

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Publication details

The article was received on 09 Jan 2018, accepted on 28 Jan 2018 and first published on 29 Jan 2018


Article type: Paper
DOI: 10.1039/C8DT00088C
Citation: Dalton Trans., 2018,47, 3452-3458
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    Highly selective sensing of Fe3+ by an anionic metal–organic framework containing uncoordinated nitrogen and carboxylate oxygen sites

    C. Chen, X. Wang, L. Li, Y. Huang and R. Cao, Dalton Trans., 2018, 47, 3452
    DOI: 10.1039/C8DT00088C

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