Amides Do Not Always Work: Observation of Guest Binding in an Amide-Functionalised Porous Host

Oguarabau Benson, Ivan Da Silva, Stephen P. Argent, Rafel Cabot, Mathew Savage, Harry Godfrey, Yong Yan, Stewart F. Parker, Pascal Manuel, Matthew Lennox , Tamoghna Mitra , Timothy Easun, William Lewis , Alexander Blake, Elena Besley, Sihai Yang, Martin Schroder

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    Abstract

    An amide-functionalised metal organic framework
    (MOF) material, MFM-136, shows a high CO2 uptake of
    12.6 mmol g-1 at 20 bar and 298 K. MFM-136 is the first example
    of acylamide pyrimidyl isophthalate MOF without
    open metal sites, and thus provides a unique platform to
    study guest binding, particularly the role of free amides.
    Neutron diffraction reveals that, surprisingly, there is no
    direct binding between the adsorbed CO2/CH4 molecules
    and the pendant amide group in the pore. This observation
    has been confirmed unambiguously by inelastic neutron
    spectroscopy. This suggests that introduction of functional
    groups solely may not necessarily induce specific guest-host
    binding in porous materials, but it is a combination of pore
    size, geometry, and functional group that leads to enhanced
    gas adsorption properties.
    Original languageEnglish
    Pages (from-to)14828-14831
    Number of pages4
    JournalJournal of the American Chemical Society
    Volume138
    Issue number45
    DOIs
    Publication statusPublished - 1 Nov 2016

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