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Phonons and Adsorption-Induced Deformations in ZIFs: Is It Really a Gate Opening?

Abstract : We report a microscopic model of the phonon-adsorption correlations in flexible metal−organic framework materials. We analyze the mechanism of the gate opening deformation using the notion of coupled phonon- and adsorption-induced structural transformation. Using the ZIF-8 structure as an example, we perform an analysis of transformation-related, low-frequency phonon modes of the framework. On the basis of structure-related quantities such as pore limiting diameter, void fraction, and adsorption uptake, we determine the conditions which lead to the gate opening transformation in ZIF-8. Energetic landscape of the deformation process is analyzed using grand thermodynamic potential of adsorption. We generalize our conclusions to other flexible ZIF structures with the same topology.
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https://hal-amu.archives-ouvertes.fr/hal-03226590
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Submitted on : Monday, June 13, 2022 - 5:50:37 PM
Last modification on : Friday, August 5, 2022 - 10:41:54 AM

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Filip Formalik, Bartosz Mazur, Michael Fischer, Lucyna Firlej, Bogdan Kuchta. Phonons and Adsorption-Induced Deformations in ZIFs: Is It Really a Gate Opening?. Journal of Physical Chemistry C, 2021, 125 (14), pp.7999-8005. ⟨10.1021/acs.jpcc.1c01342⟩. ⟨hal-03226590⟩

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