Protonated decafluorobenzophenone and the decafluorobenzophenone–arsenic pentafluoride adduct
The reaction of decafluorobenzophenone [perfluorobenzophenone, (C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>CO] with AsF<sub>5</sub> in anhydrous HF yields the protonated salt [bis(2,3,4,5,6-pentafluorophenyl)methylidene]oxidanium hexafluoridoarsenate, (C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>COH<sup>+</sup>[AsF<sub>6</sub>]<sup>-</sup>, whereas its reaction with AsF<sub>5</sub> in SO<sub>2</sub> affords the Lewis acid-base adduct decafluorobenzophenone-arsenic pentafluoride, (C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>CO·AsF<sub>5</sub>. In both compounds, the decafluorobenzophenone moiety exhibits an elongated C=O bond [1.274 (2) and 1.2526 (15) Å in the salt and adduct, respectively]. The crystal structure of (C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>COH<sup>+</sup>[AsF<sub>6</sub>]<sup>-</sup> features a short O-H...F hydrogen bond between the cation and the anion, and the crystal structure of (C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>CO·AsF<sub>5</sub> represents a rare example of a ketone coordinated to the strong Lewis acid AsF<sub>5</sub>.
Authors
- Erik Uran (ORCID: https://orcid.org/0000-0002-5450-4090)
- Matic Lozinšek (ORCID: https://orcid.org/0000-0002-1864-4248)
Institutions
- Jožef Stefan Institute (SI)
- Jožef Stefan International Postgraduate School (SI)
Publication Details
- Journal
- Acta Crystallographica Section C Structural Chemistry
- Published
- 2025-09-23
- DOI
- https://doi.org/10.1107/s2053229625007697
- Citations
- 1
- Primary Topic
- Inorganic Fluorides and Related Compounds
- Type
- article
- Field-Weighted Citation Impact
- 0.54