Sulfur difluoride

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Sulfur difluoride
Sulfur-difluoride-2D-dimensions.png Sulfur-difluoride-3D-balls.png
CAS number 13814-25-0
PubChem 139605
ChemSpider 123122
Jmol-3D images Image 1
Molecular formula SF2
Molar mass 70.062 g/mol
Except where noted otherwise, 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 with respect 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]


  1. ^ Johnson, D. R.; Powell, F. X. (1969). "Microwave Spectrum and Structure of Sulfur Difluoride". Science 164 (3882): 950–1. doi:10.1126/science.164.3882.950. PMID 17775599. 
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.