Dynamic Structural Flexibility of Fe-MOF-5 Evidenced by ⁵⁷Fe Mössbauer Spectroscopy
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Dynamic structural flexibility.pdf
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Author(s)
Ozarowski, A.
Stoian, S. A.
Brozek, Carl Kavanaugh
Dinca, Mircea
Date Issued
January 2017
Journal
Inorganic Chemistry Frontiers
Publisher
Royal Society of Chemistry
Citation
Brozek, C. K., A. Ozarowski, S. A. Stoian, and M. Dincă. “Dynamic Structural Flexibility of Fe-MOF-5 Evidenced by ⁵⁷Fe Mössbauer Spectroscopy.” Inorganic Chemistry Frontiers 4, 5 (2017): 782–788 © 2017 Royal Society of Chemistry
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Author's final manuscript
Abstract
Temperature-dependent ⁵⁷Fe Mössbauer spectra were collected on Fe[subscript x]Zn[subscript 4−x](1,4-benzenedicarboxylate)₃ (Fe-MOF-5). When measured under an Ar atmosphere, the data at higher temperatures reveal thermal population of the lowest-lying electronic excited state, as expected for low symmetry tetrahedral ferrous ions. In the presence of N₂, however, the temperature dependence becomes exaggerated and the spectra cannot be fitted to a single species. A fluctuating electric field gradient at the Fe nuclei best explains these data and suggests dynamic structural distortions induced by weak interactions with N₂. This direct evidence of dynamic behaviour at MOF open metal sites is relevant for the use of MOF SBUs in catalysis, gas separation, and other applications that invoke similar phenomena.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1039/C6QI00584E
