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Cucurbit[6]uril-based multifunctional supramolecular assemblies: synthesis, removal of Ba(II) and fluorescence sensing of Fe(III)

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Abstract

A novel cucurbit[6]uril-based (Q[6]) supramolecular assembly {(NH4)2·Q[6]·(HDTNB)2·2H2O} (1) with a three-dimensional (3D) framework structure was successfully constructed via outer-surface interactions between Q[6] and a flexible aromatic compound, 5,5′-dithiobis-(2-nitrobenzoic acid) (H2DTNB), as a structure-directing agent. It is interesting to find that assembly 1 can selectively capture Ba(II) cations among the common alkaline-earth metal ions of Mg(II), Ca(II), Sr(II) and Ba(II), resulting in the formation of an isomorphic 3D assembly {Ba(H2O)2Q[6]}·(HDTNB)2 (2). Furthermore, both assemblies 1 and 2 exhibit the selective sensing of Fe(III) ions through fluorescence quenching, which has rarely been reported for Q[n]-based supramolecular assemblies.

Graphical abstract: Cucurbit[6]uril-based multifunctional supramolecular assemblies: synthesis, removal of Ba(ii) and fluorescence sensing of Fe(iii)

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Publication details

The article was received on 16 Jan 2018, accepted on 12 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C8DT00182K
Citation: Dalton Trans., 2018, Advance Article
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    Cucurbit[6]uril-based multifunctional supramolecular assemblies: synthesis, removal of Ba(II) and fluorescence sensing of Fe(III)

    X. Zhang, Y. Zhao, K. Chen, P. Wang, Y. Kang, H. Wu and W. Sun, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT00182K

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