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Benson, Oguarabau and Da Silva, Ivan and Argent, Stephen P. and Cabot, Rafel and Savage, Mathew and Godfrey, Harry G.W. and Yan, Yong and Parker, Stewart F. and Manuel, Pascal and Lennox, Matthew J. and Mitra, Tamoghna and Easun, Timothy L. and Lewis, William and Blake, Alexander J. and Besley, Elena and Yang, Sihai and Schröder, Martin (2016) Amides do not always work: observation of guest binding in an amide-functionalised porous host. Journal of the American Chemical Society, 138 (45). pp. 14828-14831. ISSN 1520-5126

Abstract

An amide-functionalised metal organic frame-work (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 bind-ing, 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 un-ambiguously by inelastic neutron spectroscopy. This suggests that introduction of functional groups solely may not neces-sarily 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.

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