Peroxydisulfuryl difluoride

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Peroxydisulfuryl difluoride
Peroxydisulfuryldifluorid.svg
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/F2O6S2/c1-9(3,4)7-8-10(2,5)6 Yes check.svgY
    Key: CTHHBLWYPDKYFP-UHFFFAOYSA-N Yes check.svgY
  • O=S(=O)(OOS(=O)(=O)F)F
Properties
F2O6S2
Molar mass 198.11 g·mol−1
Appearancecolorless liquid
Density 1.645 g/cm3
Melting point −55.4 °C (−67.7 °F; 217.8 K)
Boiling point 67.1 °C (152.8 °F; 340.2 K)
reacts with water
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Peroxydisulfuryl difluoride is an inorganic compound from the group of peroxides. [1] The chemical formula is F2O6S2.

Contents

Synthesis

Peroxydisulfuryl difluoride can be obtained by the reaction of sulfur trioxide with fluorine in the presence of silver(II) fluoride or by electrolysis of fluorosulfuric acid. [2]

2SO3 + F2 → S2O6F2

It is also possible to prepare it by reacting chromium(V) fluoride with sulfur trioxide: [3]

CrF5 + 5SO3 → S2O6F2 + Cr(SO3F)3

or by the reaction between fluorosulfuric acid and dioxygenyl hexafluoroarsenate: [4]

2HSO3F + 2[O2][AsF6] → S2O6F2 + 2O2 + 2AsF5 + 2HF

Physical properties

Peroxydisulfuryl difluoride is a colorless liquid with an unpleasant odor that hydrolyzes with water to produce oxygen and fluorosulfuric acid. The compound can ignite organic materials upon contact. [2]

Chemical properties

It reacts with cesium fluorosulfonate and silver fluorosulfonate to produce the divalent silver compound CsAg(SO3F)3. [5]

Iodine(I) fluorosulfonate can be obtained from iodine and peroxydisulfuryl difluoride: [6]

I2 + S2O6F2 → 2ISO3F

Uses

Peroxydisulfuryl difluoride can be used to produce fluorosulfates. It is a strong oxidizing agent and can be used for the oxidation of noble metals (Ag Au Re Pt Os Rh) to the salts of fluorosulfuric acid. [2]

See also

References

  1. ↑ Dudley, F. B.; Cady, G. H. (1 February 1957). "Peroxydisulfuryl Difluoride". Journal of the American Chemical Society . 79 (3): 513–514. Bibcode:1957JAChS..79..513D. doi:10.1021/ja01560a002. ISSN   0002-7863.
  2. 1 2 3 Zefirov, Nikolai S. (2001). "Peroxydisulfuryl Difluoride". Encyclopedia of Reagents for Organic Synthesis. John Wiley & Sons, Ltd. doi:10.1002/047084289x.rp044. ISBN   0-471-93623-5.
  3. ↑ Brown, S. D.; Gard, G. L. (1 January 1975). "A new preparation of peroxydisulfuryl difluoride". Inorganic and Nuclear Chemistry Letters . 11 (1): 19–21. doi:10.1016/0020-1650(75)80140-1. ISSN   0020-1650.
  4. ↑ Šmalc, Andrej; Mayorga, Steven G.; Bartlett, Neil (1992). "Peroxydisulfuryl Difluoride (Modification)". Inorganic Syntheses. Inorganic Syntheses. Vol. 29. John Wiley & Sons, Ltd. pp. 10–11. doi:10.1002/9780470132609.ch5. ISBN   978-0-471-54470-8.
  5. ↑ Michałowski, T.; Mazej, Z.; Budzianowski, A.; Jagličić, Z.; Leszczyński, P. J.; Grochala, W. (2015). "Unexpectedly Complex Crystalline Phases in the MSO3F–Ag(SO3F)2 Phase Diagram (M = Na, K, Rb, Cs)". European Journal of Inorganic Chemistry . 2015 (2): 324–332. Bibcode:2015EJIC.2015..324M. doi:10.1002/ejic.201402948. ISSN   1099-0682.
  6. ↑ Cotton, F. Albert (17 September 2009). Progress in Inorganic Chemistry, Volume 7. John Wiley & Sons. p. 65. ISBN   978-0-470-16658-1 . Retrieved 14 August 2025.
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