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Terpyridine-based metallo-organic cages and supramolecular gelation by coordination-driven self-assembly and host–guest interaction

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Abstract

Host–guest complexation based on terpyridine (tpy) three-dimensional (3D) metallo-cages has received less attention due to the complicated structure and solubility issues. Herein, a three-armed metallo-organic ligand (L) was synthesized via three 120°-bent bis-tpy groups as a rigid tetrakis-tpy core, which possesses one benzo-21-crown-7 (B21C7) for further host–guest interaction. The metallo-organic cages [M3L2] with molecular weights up to 13 000 Da and giant cavities were prepared in near-quantitative yield by self-assembly of L with metal ions, such as Zn2+ and Fe2+. The 3D metallo-supramolecules were characterized and their formation was supported by NMR, DOSY, ESI-MS and TEM. Hosts [M3L2] were threaded through a difunctional alkylammonium salt by host–guest interactions to polymerize, and subsequently generate novel metallo-gels between [Zn3L2] and bis-ammonium salt (N2).

Graphical abstract: Terpyridine-based metallo-organic cages and supramolecular gelation by coordination-driven self-assembly and host–guest interaction

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Publication details

The article was received on 18 Mar 2018, accepted on 15 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8DT01044G
Citation: Dalton Trans., 2018, Advance Article
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    Terpyridine-based metallo-organic cages and supramolecular gelation by coordination-driven self-assembly and host–guest interaction

    D. Liu, H. Liu, B. Song, M. Chen, J. Huang, J. Wang, X. Yang, W. Sun, X. Li and P. Wang, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT01044G

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