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Sulfur difluoride
Names
	IUPAC name sulfoxylic difluoride
Identifiers
CAS Number	13814-25-0;
3D model (JSmol)	Interactive image;
ChemSpider	123122;
PubChem CID	139605;
CompTox Dashboard (EPA)	DTXSID30160500 ;
	InChI InChI=1S/F2S/c1-3-2;
	SMILES FSF;
Properties
Chemical formula	SF2
Molar mass	70.062 g/mol
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Sulfur difluoride is an inorganic compound with the chemical formula SF₂. It can be generated by the reaction of sulfur dichloride and potassium fluoride or mercury(II) fluoride at low pressures:

SCl₂ + 2 KF → SF₂ + 2 KCl

SCl₂ + HgF₂ → SF₂ + HgCl₂

The F−S−F bond angle is 98°, and the length of S−F bond is 159 pm.^[1] The compound is highly unstable, dimerising to FSSF₃. This unsymmetrical isomer of S₂F₄ is proposed to arise via insertion of SF₂ into the S−F bond of a second molecule SF₂:^[2]

It can also be formed from oxygen difluoride and hydrogen sulfide:^{[citation needed]}

OF₂ + H₂S → SF₂ + H₂O

References

^ Johnson, D. R.; Powell, F. X. (1969). "Microwave Spectrum and Structure of Sulfur Difluoride". Science. 164 (3882): 950–1. Bibcode:1969Sci...164..950J. doi:10.1126/science.164.3882.950. PMID 17775599. S2CID 46046291.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[1] Johnson, D. R.; Powell, F. X. (1969). "Microwave Spectrum and Structure of Sulfur Difluoride". Science. 164 (3882): 950–1. Bibcode:1969Sci...164..950J. doi:10.1126/science.164.3882.950. PMID 17775599. S2CID 46046291.

[2] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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