Investigating the mechanical stability of flexible metal-organic frameworks.

Autor: Son FA; Department of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL, 60208, USA., Fahy KM; Department of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL, 60208, USA., Gaidimas MA; Department of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL, 60208, USA., Smoljan CS; Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, 60208, USA., Wasson MC; Department of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL, 60208, USA., Farha OK; Department of Chemistry and International Institute for Nanotechnology, Northwestern University, Evanston, IL, 60208, USA. o-farha@northwestern.edu.; Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, 60208, USA. o-farha@northwestern.edu.
Jazyk: angličtina
Zdroj: Communications chemistry [Commun Chem] 2023 Sep 05; Vol. 6 (1), pp. 185. Date of Electronic Publication: 2023 Sep 05.
DOI: 10.1038/s42004-023-00981-8
Abstrakt: As we continue to develop metal-organic frameworks (MOFs) for potential industrial applications, it becomes increasingly imperative to understand their mechanical stability. Notably, amongst flexible MOFs, structure-property relationships regarding their compressibility under pressure remain unclear. In this work, we conducted in situ variable pressure powder X-ray diffraction (PXRD) measurements up to moderate pressures (<1 GPa) using a synchrotron source on two families of flexible MOFs: (i) NU-1400 and NU-1401, and (ii) MIL-88B, MIL-88B-(CH 3 ) 2 , and MIL-88B-(CH 3 ) 4 . In this project scope, we found a positive correlation between bulk moduli and degree of flexibility, where increased rigidity (e.g., smaller swelling or breathing amplitude) arising from steric hindrance was deleterious, and observed reversibility in the unit cell compression of these MOFs. This study serves as a primer for the community to begin to untangle the factors that engender flexible frameworks with mechanical resilience.
(© 2023. Springer Nature Limited.)
Databáze: MEDLINE
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