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

18 April 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


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.


Lewis superacids
C-F Bond Activation
aluminium fluorides
aluminium teflates

Supplementary materials

Supporting Material - Analytical Data
supporting material containing analytical data


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