An Amorphous Teflate Doped Aluminium Chlorofluoride: A Solid Lewis‐Superacid for the Dehydrofluorination of Fluoroalkanes

Author:

Bui Minh1,Hoffmann Kurt F.2,Braun Thomas1ORCID,Riedel Sebastian2ORCID,Heinekamp Christian13ORCID,Scheurell Kerstin1,Scholz Gudrun1,Stawski Tomasz M.3ORCID,Emmerling Franziska13ORCID

Affiliation:

1. Department of Chemistry Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 D-12489 Berlin Germany

2. Institut für Chemie und Biochemie Freie Universität Berlin Fabeckstraße 34/36 D-14195 Berlin Germany

3. BAM Federal Institute for Materials Research and Testing Richard-Willstätter-Straße 11 D-12489 Berlin Germany

Abstract

AbstractAn 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.

Funder

Deutsche Forschungsgemeinschaft

Diamond Light Source

Publisher

Wiley

Subject

Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Catalysis

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