title: 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.
abstract: The present study illustrates the importance of the oxidation state of iron within the mesoporous iron trimesate [{Fe(3)O(H(2)O)(2)F(0.81)(OH)(0.19)}{C(6)H(3)(CO(2))(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 CO(2), 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 Fe(2+) sites compared to that of Fe(3+) ones, as shown by pyridine adsorption.
authors: Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen Basse Normandie, CNRS, 6 boulevard du Maréchal Juin, 14050 Caen, France.
authors: Hervé
authors: H
authors: Leclerc
authors: Alexandre
authors: A
authors: Vimont
authors: Jean-Claude
authors: JC
authors: Lavalley
authors: Marco
authors: M
authors: Daturi
authors: Andrew D
authors: AD
authors: Wiersum
authors: Philip L
authors: PL
authors: Llwellyn
authors: Patricia
authors: P
authors: Horcajada
authors: Gérard
authors: G
authors: Férey
authors: Christian
authors: C
authors: Serre