Issue 40, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
18 mar 2018
Accepted
15 maj 2018
First published
16 maj 2018

Dalton Trans., 2018,47, 14227-14232

Author version available

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, 47, 14227 DOI: 10.1039/C8DT01044G

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