Elucidating Lewis acidity of metal sites in MFU-4l metal-organic frameworks: N2
O and CO2 adsorption in MFU-4l, CuI-MFU-4l and Li-MFU-4l

Denysenko, Dmytro; Jelic, Jelena; Magdysyuk, Oxana V.; Reuter, Karsten; Volkmer, Dirk

doi:/10.1016/j.micromeso.2015.03.014

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Elucidating Lewis acidity of metal sites in MFU-4l metal-organic frameworks: N₂O and CO₂ adsorption in MFU-4l, Cu^I-MFU-4l and Li-MFU-4l

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Denysenko, D., Jelic, J., Magdysyuk, O. V., Reuter, K., & Volkmer, D. (2015). Elucidating Lewis acidity of metal sites in MFU-4l metal-organic frameworks: N₂O and CO₂ adsorption in MFU-4l, Cu^I-MFU-4l and Li-MFU-4l. Microporous and Mesoporous Materials, 216, 146-150. doi:/10.1016/j.micromeso.2015.03.014.

Cite as: https://hdl.handle.net/21.11116/0000-000A-C152-F

Abstract

The interaction strength of N₂O and CO₂ molecules with different Lewis-acidic sites within MFU-4l–type metal-organic frameworks was studied via gas sorption measurements and density-functional theory calculations. MFU-4l comprising Zn–Cl units shows only physisorption of both gases. Introduction of Li into the parent MFU-4l framework leads to a remarkable increase of binding strength of both N₂O and CO₂ showing considerable Lewis acidity of Li^I centers. Cu^I-MFU-4l shows even stronger binding of N₂O, as compared to Li-MFU-4l, whereas CO₂ doesn't bind to Cu^I centers. Preferential binding of N₂O to Cu^I centers was also confirmed by in situ synchrotron X-ray powder diffraction measurements. These results show that Cu^I-MFU-4l can be considered as a material for selective N₂O adsorption.