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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2015
Author Zhao Pu, Bennet Thomas, Casati Nicola, Lampronti Giulio, Moggach Stephen, Redfern Simon,
Project Chemical bonding and reactions in molecular crystals at high pressure
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Original article (peer-reviewed)

Journal Dalton Transactions
Volume (Issue) 44
Page(s) 4498 - 4503
Title of proceedings Dalton Transactions
DOI 10.1039/c4dt02680b

Open Access

URL http://pubs.rsc.org/en/content/articlepdf/2015/dt/c4dt02680b
Type of Open Access Publisher (Gold Open Access)

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.
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