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A robust Zn(II)/Na(I)-MOF decorated with [(OAc)2(H2O)2]n2n− anions for luminescent sensing of copper ion based on the inner filter effect

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 fluorescent detection of Cu2+ ion. 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 of ligand-to-metal, result in a good luminescent peak at 412 nm and efficient fluorescence quenching of MOF 1 in the presence of Cu2+ ion, due to the inner filter effect. The interactions between Cu2+ ion and OAc− anion in the channel endow Cu2+ ion with a facile access to be adsorbed and afforded the selective quenching of the fluorescence. The MOF particles are well dispersed in water and Cu2+ ion are pre-concentrated by the adsorption, thus facilitating the determination of Cu2+ ion with a detection limit down to 0.65 mM. Our work thus paves a way for developing MOFs as an appealing platform to construct materials for environmental applications.

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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, Accepted Manuscript
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    A robust Zn(II)/Na(I)-MOF decorated with [(OAc)2(H2O)2]n2n− anions for luminescent sensing of copper ion 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, Accepted Manuscript , DOI: 10.1039/C8DT00908B

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