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Article Dans Une Revue J Chem Phys Année : 2024

Reversible solvent interactions with UiO-67 metal-organic frameworks.

Résumé

The utility of UiO-67 Metal-Organic Frameworks (MOFs) for practical applications requires a comprehensive understanding of intermolecular host-guest MOF-analyte interactions. To investigate intermolecular interactions between UiO-67 MOFs and complex molecules, it is useful to evaluate the interactions with simple polar and non-polar analytes. This problem is approached by investigating the interactions of polar (acetone and isopropanol) and non-polar (n-heptane) molecules with functionalized UiO-67 MOFs via temperature programmed desorption mass spectrometry and temperature programmed Fourier transform infrared spectroscopy. We find that isopropanol, acetone, and n-heptane bind reversibly and non-destructively to UiO-67 MOFs, where MOF and analyte functionality influence relative binding strengths (n-heptane ≈ isopropanol > acetone). During heating, all three analytes diffuse into the internal pore environment and directly interact with the μ3-OH groups located within the tetrahedral pores, evidenced by the IR response of ν(μ3-OH). We observe nonlinear changes in the infrared cross sections of the ν(CH) modes of acetone, isopropanol, and n-heptane following diffusion into UiO-67. Similarly, acetone's ν(C=O) infrared cross section increases dramatically when diffused into UiO-67. Ultimately, this in situ investigation provides insights into how individual molecular functional groups interact with UiO MOFs and enables a foundation where MOF interactions with complex molecular systems can be evaluated.
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Dates et versions

hal-04575912 , version 1 (15-05-2024)

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Isabella Goodenough, Mikaela C Boyanich, Ryan P Mcdonnell, Lauren Castellana, Venkata Swaroopa Datta Devulapalli, et al.. Reversible solvent interactions with UiO-67 metal-organic frameworks.. J Chem Phys, 2024, J Chem Phys, 160, ⟨10.1063/5.0180924⟩. ⟨hal-04575912⟩
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