Open AccessA XAFS study of the local environment and reactivity of Pt- sites in functionalized UiO-67 MOFs
Author(s) -
Elisa Borfecchia,
Sigurd Øien,
Stian Svelle,
Lorenzo Mino,
Luca Braglia,
Giovanni Agostini,
Erik Gallo,
Kirill A. Lomachenko,
Silvia Bordiga,
Alexander A. Guda,
Mikhail A. Soldatov,
А. В. Солдатов,
Unni Olsbye,
Karl Petter Lillerud,
Carlo Lamberti
Publication year - 2016
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/712/1/012125
Subject(s) - x ray absorption fine structure , reactivity (psychology) , xanes , chemistry , ligand (biochemistry) , oxidation state , catalysis , metal organic framework , redox , inorganic chemistry , spectroscopy , organic chemistry , adsorption , medicine , biochemistry , physics , alternative medicine , pathology , quantum mechanics , receptor
International audienceWe synthesized UiO-67 Metal Organic Frameworks (MOFs) functionalized with bpydcPt(II)Cl-2 and bpydcPt(IV)Cl-4 complexes (bpydc = bipyridine-dicarboxylate), as attractive candidates for the heterogenization of homogeneous catalytic reactions. Pt L-3-edge XAFS experiments allowed us to thoroughly characterize these materials, in the local environment of the Pt centers. XAFS studies evidenced the rich reactivity of UiO-67-Pt(II) MOFs, including reduction to bpydcPt(0) under H-2 flow in the 600-700 K range, room-temperature oxidation to bpydcPt(IV)Br-4 through oxidative addition of liquid Br-2 and ligand exchange between 2 Cl- and even bulky ligands such as toluene-3,4-dithiol. Preliminary XANES simulations with ADF code provide additional information on the oxidation state of Pt site