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Issue 24, 2011
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Infrared study of the influence of reducible iron(III) metal sites on the adsorption of CO, CO2, propane, propene and propyne in the mesoporous metal–organic framework MIL-100

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Abstract

The present study illustrates the importance of the oxidation state of iron within the mesoporous iron trimesate [{Fe3O(H2O)2F0.81(OH)0.19}{C6H3(CO2)3}2] denoted MIL-100(Fe) (MIL= Material from Institut Lavoisier) during adsorption of molecules that can interact with the accessible metal sites through π-back donation. Adsorption of CO has been first followed by FTIR spectroscopy to quantify the Lewis acid sites in the dehydrated Fe(III) sample, outgassed at 150 °C, and on the partially reduced Fe(II/III), outgassed at 250 °C. The exposure of MIL-100(Fe) to CO2, propane, propene and propyne has then been studied by FTIR spectroscopy and microcalorimetry. It appears that π-back donating molecules are strongly adsorbed on reduced iron(II) sites despite the weaker Lewis acidity of cus Fe2+ sites compared to that of Fe3+ ones, as shown by pyridine adsorption.

Graphical abstract: Infrared study of the influence of reducible iron(iii) metal sites on the adsorption of CO, CO2, propane, propene and propyne in the mesoporous metal–organic framework MIL-100

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Publication details

The article was received on 24 Feb 2011, accepted on 20 Apr 2011 and first published on 19 May 2011


Article type: Paper
DOI: 10.1039/C1CP20502A
Citation: Phys. Chem. Chem. Phys., 2011,13, 11748-11756
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    Infrared study of the influence of reducible iron(III) metal sites on the adsorption of CO, CO2, propane, propene and propyne in the mesoporous metal–organic framework MIL-100

    H. Leclerc, A. Vimont, J. Lavalley, M. Daturi, A. D. Wiersum, P. L. Llwellyn, P. Horcajada, G. Férey and C. Serre, Phys. Chem. Chem. Phys., 2011, 13, 11748
    DOI: 10.1039/C1CP20502A

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