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Issue 10, 2015
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Pressure-induced oversaturation and phase transition in zeolitic imidazolate frameworks with remarkable mechanical stability

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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.

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

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Publication details

The article was received on 02 Sep 2014, accepted on 23 Jan 2015 and first published on 23 Jan 2015


Article type: Paper
DOI: 10.1039/C4DT02680B
Citation: Dalton Trans., 2015,44, 4498-4503
  • Open access: Creative Commons BY license
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    Pressure-induced oversaturation and phase transition in zeolitic imidazolate frameworks with remarkable mechanical stability

    P. Zhao, T. D. Bennett, N. P. M. Casati, G. I. Lampronti, S. A. Moggach and S. A. T. Redfern, Dalton Trans., 2015, 44, 4498
    DOI: 10.1039/C4DT02680B

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