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The zeolitic imidazolate framework ZIF-4 under low hydrostatic pressures

DOI: 10.1002/zaac.201900046 DOI Help

Authors: Pia Vervoorts (Technical University of Munich) , Claire L. Hobday (The University of Edinburgh) , Michael G. Ehrenreich (Technical University of Munich) , Dominik Daisenberger (Diamond Light Source) , Gregor Kieslich (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Zeitschrift Für Anorganische Und Allgemeine Chemie , VOL 4

State: Published (Approved)
Published: July 2019
Diamond Proposal Number(s): 19187

Abstract: The zeolitic imidazolate framework ZIF‐4 has recently been shown to exhibit large structural flexibility as a response to hydrostatic pressures, going from an open pore phase (ZIF‐4(Zn)‐op) to a closed pore phase (ZIF‐4(Zn)‐cp). The use of diamond anvil cell (DAC) setups has so far restricted thorough experimental insight into the evolution of lattice parameters at pressures below p < 0.1 GPa. Here we revisit the high‐pressure properties of ZIF‐4(Zn) by applying a new high‐pressure powder X‐ray diffraction setup that allows for tracking the evolution of lattice parameters in pressure increments as small as Δp = 0.005 GPa in the pressure range p = ambient – 0.4 GPa; a pressure resolution that cannot be achieved by using traditional DACs. We find ZIF‐4(Zn) has a bulk modulus of K(ZIF‐4(Zn)‐op) = 2.01 ± 0.05 GPa and K(ZIF‐4(Zn)‐cp) = 4.39 ± 0.20 GPa, clarifying and confirming some ambiguous results that have been reported previously.

Journal Keywords: Flexible metal-organic frameworks; Zinc; Flexibility; Bulk modulus; High pressure

Subject Areas: Materials, Chemistry


Instruments: I15-Extreme Conditions