Abstract
We synthesized UiO-67 metal-organic-frameworks (MOFs) functionalized with different transition metals (Rh, Ir). Using EXAFS we verified that the synthesis has been successful. Furthermore, we observed the change of local environment while varying of metal site. XAS spectroscopy is the most informative technique to characterize these kind of materials and to study the local environment around the metal site.
Highlights
Metal-organic frameworks (MOFs) are crystalline, porous solids consisting of metal ions or clusters, coordinated with organic molecules
Using EXAFS we verified that the synthesis has been successful
In a recent study [3] we have characterized Pt-functionalized UiO-67 using three types of syntheses and followed the reactivity of this system towards molecules of small- (e.g. H2), medium- (e.g. Br2), and large-size. After these interesting results obtained with Pt, UiO-67 derivatives functionalized with different transition metals were prepared, targeting different kinds of catalytic reactions
Summary
Metal-organic frameworks (MOFs) are crystalline, porous solids consisting of metal ions or clusters, coordinated with organic molecules. The recently discovered UiO-66 and UiO-67 classes of iso-structural MOFs are obtained connecting Zr6O4(OH) inorganic cornerstones with 1,4-benzene-dicarboxylate or 4,4′biphenyl-dicarboxylate linkers, for the UiO-66 and UiO-67 MOFs, respectively [2] Due to their outstanding stability at high temperatures, high pressures and in presence of different solvents, these materials are among the few MOFs already commercialized for applications in the fields of catalysis, H2 storage, and gas purification. In a recent study [3] we have characterized Pt-functionalized UiO-67 using three types of syntheses and followed the reactivity of this system towards molecules of small- (e.g. H2), medium- (e.g. Br2), and large-size (e.g. thiol). After these interesting results obtained with Pt, UiO-67 derivatives functionalized with different transition metals were prepared, targeting different kinds of catalytic reactions. We report a preliminary XAS-based study on UiO-67 functionalized with Rh, Ir and Au in in situ conditions to demonstrate the effectiveness of synthesis procedure
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