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Dual-emissive metal–organic framework: a novel turn-on and ratiometric fluorescent sensor for highly efficient and specific detection of hypochlorite

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Abstract

Hypochlorite (ClO) is widely used as a disinfectant, whose residue content in water should be strictly controlled due to the potential threat to human health in an inappropriate concentration. Herein, dual-emissive metal–organic frameworks with a UiO-66 prototype structure, PDA/Eu/PDA-UiO-66-NH2(x), were elegantly designed and prepared by a mixed ligand assembly and sequential post-synthesis strategy. Since blue emission is sensitive to ClO, PDA/Eu/PDA-UiO-66-NH2(40) was selected as a model nanosensor for ratiometric and turn-on sensing of ClO while red emission acts as a reference signal. Remarkably, PDA/Eu/PDA-UiO-66-NH2(40) shows high efficiency and specificity toward ClO detection, as verified by a very short response time of 15 s, a wide linear range of 0.1–60 μM, a low detection limit of 0.10 μM, and excellent selectivity toward common competing ions. The recovery experiments show that the recoveries of spiking ClO in tap water range from 96 to 103%. The rigidification of the coordinated H2N–BDC2− ligands should be responsible for the turn-on fluorescence of PDA/Eu/PDA-UiO-66-NH2(40). This work not only shows a highly efficient and specific fluorescent nanosensor for ClO detection but also presents the first MOF-based fluorescent probe for turn-on and ratiometric sensing of ClO.

Graphical abstract: Dual-emissive metal–organic framework: a novel turn-on and ratiometric fluorescent sensor for highly efficient and specific detection of hypochlorite

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Supplementary files

Article information


Submitted
08 Jun 2020
Accepted
24 Jun 2020
First published
25 Jun 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Dual-emissive metal–organic framework: a novel turn-on and ratiometric fluorescent sensor for highly efficient and specific detection of hypochlorite

Y. Zeng, H. Zheng, X. He, G. Cao, B. Wang, K. Wu and Z. Lin, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT02041A

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