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Issue 23, 2018
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A robust Zn(II)/Na(I)-MOF decorated with [(OAc)2(H2O)2]n2n anions for the luminescence sensing of copper ions based on the inner filter effect

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Abstract

Based on the inner filter effect, a luminescent Zn(II)/Na(I) metal–organic framework (MOF) {[Zn2Na(L)(HL)2(H2O)2][OAc]·2H2O}n (1, H2L = 5-methyl-1,3-benzenedicarboxylic acid) with excellent stability was constructed for the fluorescence detection of Cu2+ ions. MOF 1 holds a 3D cationic framework in which [(OAc)2(H2O)2]n2n anions are embedded into its 1D channels. Abundant hydrogen-bonding and π–π interactions in the MOF facilitate electron transfer from ligand-to-metal, resulting in a good luminescence peak at 412 nm and an efficient fluorescence quenching of MOF 1 in the presence of Cu2+ ions, due to the inner filter effect. The interactions between the Cu2+ ions and the OAc anion in the channel endowed the Cu2+ ions with facile access to be adsorbed, and afforded the selective quenching of fluorescence. The MOF particles are well dispersed in water and the Cu2+ ions are pre-concentrated by adsorption, thus facilitating the determination of Cu2+ ions with a detection limit down to 0.65 μM. Our work thus paves a way for developing MOFs as an appealing platform to construct materials for environmental applications.

Graphical abstract: A robust Zn(ii)/Na(i)-MOF decorated with [(OAc)2(H2O)2]n2n− anions for the luminescence sensing of copper ions based on the inner filter effect

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Publication details

The article was received on 09 Mar 2018, accepted on 15 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8DT00908B
Citation: Dalton Trans., 2018,47, 7787-7794
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    A robust Zn(II)/Na(I)-MOF decorated with [(OAc)2(H2O)2]n2n anions for the luminescence sensing of copper ions based on the inner filter effect

    L. Liu, Y. Yu, X. Zhao, Y. Wang, F. Cheng, M. Zhang, J. Shu and L. Liu, Dalton Trans., 2018, 47, 7787
    DOI: 10.1039/C8DT00908B

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