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Issue 37, 2017
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An ultrastable zinc(II)–organic framework as a recyclable multi-responsive luminescent sensor for Cr(III), Cr(VI) and 4-nitrophenol in the aqueous phase with high selectivity and sensitivity

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Abstract

A 2D zinc(II) metal–organic framework (Zn-MOF-1) formulated as [Zn(L)(H2O)]·H2O (1) (H2L = 5-(2-methylpyridin-4-yl)isophthalic acid) with blue fluorescence has been successfully obtained under hydrothermal conditions. Zn-MOF-1 contains microporous parallelogram channels with accessible Lewis-base sites, coordinated water molecules and uncoordinated carboxylates, which are easy to anchor and recognise various analytes. The fluorescence investigations demonstrated that the blue-light-emitting behaviour of Zn-MOF-1 possesses excellent water and pH stability. More importantly, this is the first reported recyclable multi-responsive Zn-MOF fluorescence sensor for Cr(III), Cr(VI) (CrO42−/Cr2O72− ions) and 4-NP (4-nitrophenol) simultaneously with high selectivity and sensitivity and low detection limits in aqueous solution through fluorescence quenching. Furthermore, the mechanism for the selective sensing of Cr3+, CrO42−, Cr2O72− or 4-NP can mainly be explained by the competition between the absorption of the analytes and the excitation/emission of Zn-MOF-1, and the electronic interactions between Zn-MOF-1 and the analytes.

Graphical abstract: An ultrastable zinc(ii)–organic framework as a recyclable multi-responsive luminescent sensor for Cr(iii), Cr(vi) and 4-nitrophenol in the aqueous phase with high selectivity and sensitivity

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Publication details

The article was received on 07 Jul 2017, accepted on 29 Aug 2017 and first published on 29 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA05896A
Citation: J. Mater. Chem. A, 2017,5, 20035-20043
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    An ultrastable zinc(II)–organic framework as a recyclable multi-responsive luminescent sensor for Cr(III), Cr(VI) and 4-nitrophenol in the aqueous phase with high selectivity and sensitivity

    X. Guo, F. Zhao, J. Liu, Z. Liu and Y. Wang, J. Mater. Chem. A, 2017, 5, 20035
    DOI: 10.1039/C7TA05896A

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