Disulfuryl fluoride

Disulfuryl fluoride

Names
Other names Pyrosulfuryl fluoride
Identifiers
CAS Number	13036-75-4  Y
3D model (JSmol)	Interactive image
ChemSpider	74939  N
ECHA InfoCard	100.032.624
EC Number	235-903-0
PubChem CID	83067
CompTox Dashboard (EPA)	DTXSID7065332
InChI InChI=1S/F2O5S2/c1-8(3,4)7-9(2,5)6 Y Key: WICQXESQFGXSKV-UHFFFAOYSA-N Y
SMILES O=S(=O)(OS(=O)(=O)F)F
Properties
Chemical formula	F2O5S2
Molar mass	182.11 g·mol−1
Appearance	colorless liquid
Density	1.75 g/cm3
Melting point	–48 °C
Boiling point	50.8 °C
Solubility in water	reacts with water
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Disulfuryl fluoride is an inorganic compound of sulfur, fluorine, and oxygen with the chemical formula S₂O₅F₂.

Synthesis

Autoclave heating of sulfur trioxide and calcium fluoride:

3SO₃ + CaF₂ → S₂O₅F₂ + CaSO₄

The compound can be produced by the reaction of SSF₂ and FOSO₂F in deuterated chloroform at −100 °C: ^[1]

2SSF₂ + 4FOSO₂F → 2S₂O₅F₂ + 2SOF₂ + SF₄ + 1⁄₈S₈

It can also be produced in the reaction of iodine pentafluoride and sulfur trioxide. ^[2]

Other methods are also known. ^[3]

Physical properties

Pyrosulfuryl difluoride forms a colorless liquid that smokes slightly in the air. It causes severe suffocation and resembles phosgene in its action. ^{[4] [5]}

Chemical properties

When heated, the compound is stable to a temperature of 200 °C.

It is slowly hydrolyzed by water:

S₂O₅F₂ + H₂O → 2HSO₃F

It reacts with tetraethyl titanate to produce diethoxytitanium difluorosulfonate: ^[6]

Ti(OC₂H₅)₄ + 2S₂O₅F₂ → Ti(OC₂H₅)₂(O₃SF)₂ + 2C₂H₅OSO₂F

See also

• Disulfuryl chloride
• Disulfuryl chloride fluoride
• Peroxydisulfuryl difluoride

References

1. Willner, H.; Mistry, F.; Aubke, F. (1 December 1992). "Selected reactions of fluorine-fluorosulfate, FOSO2F" . Journal of Fluorine Chemistry. 59 (3): 333–349. doi:10.1016/S0022-1139(00)80329-2. ISSN   0022-1139 . Retrieved 15 August 2025.
2. Cernik, M. (1987). "ChemInform Abstract: Reaction of Iodine Pentafluoride with Sulfur Trioxide" . ChemInform . 18 (33) chin.198733027. doi:10.1002/chin.198733027. ISSN   1522-2667 . Retrieved 15 August 2025.
3. Inorganic Syntheses, Volume 11. John Wiley & Sons. 22 September 2009. p. 151. ISBN   978-0-470-13277-7 . Retrieved 16 August 2025.
4. Simons, J. H. (2 December 2012). Fluorine Chemistry V5. Elsevier. p. 70. ISBN   978-0-323-14724-8 . Retrieved 16 August 2025.
5. Ryss, Iosif Grigorʹevich (1960). The Chemistry of Fluorine and Its Inorganic Compounds. U. S. Atomic Energy Commission, Technical Information Service Extension. p. 185. Retrieved 16 August 2025.
6. Niyogi, Debyani G.; Singh, Sukhjinder; Saini, Anju; Verma, R. D. (1 February 1994). "Reactions of fluorinated acid anhydrides with metal alkoxides" . Journal of Fluorine Chemistry. 66 (2): 153–158. Bibcode:1994JFluC..66..153N. doi:10.1016/0022-1139(93)03012-B. ISSN   0022-1139 . Retrieved 15 August 2025.