Pressure-induced oversaturation and phase transition in zeolitic imidazolate frameworks with remarkable mechanical stability

Zhao, Pu and Bennett, Thomas D. and Casati, Nicola P. M. and Lampronti, Giulio I. and Moggach, Stephen A. and Redfern, Simon A. T. (2015) Pressure-induced oversaturation and phase transition in zeolitic imidazolate frameworks with remarkable mechanical stability. Dalton Transactions, 44 (10). pp. 4498-4503. ISSN 1477-9226 1477-9234 DOI 10.1039/C4DT02680B

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Abstract

Zeolitic imidazolate frameworks (ZIFs) 7 and 9 are excellent candidates for CO2 adsorption and storage. Here, high-pressure X-ray diffraction is used to further understand their potential in realistic industrial applications. ZIF-7 and ZIF-9 are shown be able to withstand high hydrostatic pressures whilst retaining their porosity and structural integrity through a new ferroelastic phase transition. This stability is attributed to the presence of sterically large organic ligands. Results confirm the notable influence of guest occupancy on the response of ZIFs to pressure; oversaturation of ZIFs with solvent molecules greatly decreases their compressibility and increases their resistance to amorphisation. By comparing the behaviours of both ZIFs under high pressure, it is demonstrated that their mechanical stability is not affected by metal substitution. The evacuated ZIF-7 phase, ZIF-7-II, is shown to be able to recover to the ZIF-7 structure with excellent resistance to pressure. Examining the pressure-related structural behaviours of ZIF-7 and ZIF-9, we have assessed the great industrial potential of ZIFs.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA68;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Dalton Transactions
Volume: 44
Page Range: pp. 4498-4503
Identification Number: 10.1039/C4DT02680B
Depositing User: Sarah Humbert
Date Deposited: 27 Mar 2015 18:33
Last Modified: 04 Jun 2015 16:22
URI: http://eprints.esc.cam.ac.uk/id/eprint/3270

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