Peroxydisulfuryl difluoride

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Peroxydisulfuryl difluoride
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/F2O6S2/c1-9(3,4)7-8-10(2,5)6 checkY
    Key: CTHHBLWYPDKYFP-UHFFFAOYSA-N checkY
  • O=S(=O)(OOS(=O)(=O)F)F
Properties
F2O6S2
Molar mass 198.11 g·mol−1
Appearance colorless 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.

Synthesis

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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

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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

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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

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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

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References

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  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. ^ a b c 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.