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Intrinsic flexibility of the zeolitic imidazolate framework ZIF-7 unveiled by CO2 adsorption and Hg intrusion

Pera-Titus, Marc 2014. Intrinsic flexibility of the zeolitic imidazolate framework ZIF-7 unveiled by CO2 adsorption and Hg intrusion. ChemPhysChem 15 (8) , pp. 1581-1586. 10.1002/cphc.201400084

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Abstract

ZIF‐7, built as an assembly of ZnII centers and benzimidazolate ligands, shows prominent S‐shaped isotherms upon CO2 adsorption that can be attributed to sorbate‐induced gate‐opening phenomena involving a narrow‐to‐large pore phase transition. This peculiar sorption pattern can be captured via the formulation of thermodynamic isotherms, providing a direct enthalpic and entropic view of the gate‐opening process. Relying on such an approach, an energy barrier with preferential enthalpic nature for CO2 adsorption/desorption in the gate‐opening region could be unveiled. Moreover, the elastic energy involved during the gate‐opening process was revisited to 1.4–2.8 kJ mol−1 of solid in the temperature range 273–323 K, matching the value measured by isostatic compression of a ZIF‐7_lp sample filled with DMF and showing a dominant entropic contribution.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Wiley-VCH Verlag
ISSN: 1439-4235
Last Modified: 11 Jan 2021 16:15
URI: http://orca.cardiff.ac.uk/id/eprint/137426

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