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Disulfuryl fluoride
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| Names | |
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| Other names
Pyrosulfuryl fluoride | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.032.624 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| 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 |
| reacts with water | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Disulfuryl fluoride is an inorganic compound of sulfur, fluorine, and oxygen with the chemical formula S2O5F2. This is the anhydride of fluorosulfuric acid.
Synthesis
Autoclave heating of sulfur trioxide and calcium fluoride:
- S2O5F2 + CaSO4"}},"i":0}}]}' id="mwEw"/>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:
- 2HSO3F"}},"i":0}}]}' id="mwQw"/>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
References
- ↑ 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.
- ↑ 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.
- ↑ Inorganic Syntheses, Volume 11. John Wiley & Sons. 22 September 2009. p. 151. ISBN 978-0-470-13277-7. Retrieved 16 August 2025.
- ↑ Simons, J. H. (2 December 2012). Fluorine Chemistry V5. Elsevier. p. 70. ISBN 978-0-323-14724-8. Retrieved 16 August 2025.
- ↑ 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.
- ↑ 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.