Sulfur difluoride

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

Quick facts Names, Identifiers ...

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

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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