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An amorphous teflate doped aluminium chlorofluoride: a solid lewis-superacid for the dehydrofluorination of fluoroalkanes

DOI: 10.1002/cctc.202300350 DOI Help

Authors: Minh Bui (Humboldt-Universitat zu Berlin) , Kurt Hoffmann (Freie Universitat Berlin) , Thomas Braun (Humboldt University) , Sebastian Riedel (Freie Universitat Berlin) , Christian Heinekamp (Humboldt-Universitat zu Berlin) , Kerstin Scheurell (Humboldt-Universitat zu Berlin) , Gudrun Scholz (Humboldt-Universitat zu Berlin) , Tomasz M. Stawski (Bundesanstalt für Materialforschung und -prüfung) , Franziska Emmerling (Bundesanstalt für Materialforschung und -prüfung)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemcatchem

State: Published (Approved)
Published: March 2023
Diamond Proposal Number(s): 28776

Abstract: An anion doped aluminium chlorofluoride AlCl0.1F2.8(OTeF5)0.1 (ACF-teflate) was synthesized. The material contains pentafluoroorthotellurate (teflate) groups, which mimic fluoride ions electronically, but are sterically more demanding. They are embedded into the amorphous structure. The latter was studied by PDF analysis, EXAFS data and MAS NMR spectroscopy. The mesoporous powder is a Lewis superacid, and ATR-IR spectra of adsorbed CD3CN reveal a blue-shift of the adsorption band by 73 cm−1, which is larger than the shift for SbF5. Remarkably, ACF-teflate catalyzes dehydrofluorination reactions of monofluoroalkanes to yield olefins in C6D6. In these cases, no Friedel-Crafts products were formed.

Journal Keywords: Lewis superacids; C–F activation; silanes; aluminium teflates; aluminium fluorides

Subject Areas: Chemistry, Materials

Instruments: I15-1-X-ray Pair Distribution Function (XPDF)

Added On: 12/03/2023 20:02

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Physical Chemistry Catalysis Chemistry Materials Science Chemical Engineering Engineering & Technology

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