Disulfur difluoride

Disulfur difluoride

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Names
IUPAC name fluorosulfanyl thiohypofluorite
Identifiers
CAS Number	13709-35-8
ChemSpider	109926
Jmol 3D model	Interactive image
PubChem	123323
InChI InChI=1S/F2S2/c1-3-4-2
SMILES FSSF
Properties
Chemical formula	S2F2
Molar mass	102.127 g/mol
Vapor pressure	{{{value}}}
Related compounds
Related compounds	O 2F 2 S 2Cl 2 SF 2
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Disulfur difluoride is a halide of sulfur, with the chemical formula S₂F₂.

Structure

Disulfur difluoride will undergo intramolecular rearrangement in the presence of alkali elements' fluorides, yielding the isomer S=SF₂:

$\rm \ FS-SF \xrightarrow{KF} S=SF_2$

Synthesis

Silver(II) fluoride can fluorinate sulfur in a strictly dry container, and the reaction produces FS-SF:

$\rm \ S_8 + 8 AgF_2 \xrightarrow{398K} 4 S_2F_2 + 8 AgF$

S=SF₂ can be synthesized with the reaction of potassium fluorosulfite and disulfur dichloride:

$\rm \ 2 KSO_2F + S_2Cl_2 \rightarrow S=SF_2 + 2 KCl + 2 SO_2$

Reactions

• Decomposing to sulfur tetrafluoride and sulfur when heated:

$\mathrm{2S_2F_2 \ \xrightarrow{180^oC}\ SF_4 + 3S }$

• Treated with water:

$\mathrm{2S_2F_2 + 2H_2O \ \xrightarrow{}\ SO_2 + 3S + 4HF }$

• Reacting with sulfuric acid:

$\mathrm{S_2F_2 + 3H_2SO_4 \ \xrightarrow{80^oC}\ 5SO_2 + 2HF + 2H_2O }$

• Reacting with sodium hydroxide:

$\mathrm{2S_2F_2 + 6NaOH \ \xrightarrow{}\ Na_2SO_3 + 3S + 4NaF + 3H_2O }$

• Reacting with oxygen at high pressure, using nitrogen dioxide as the catalyst:

$\mathrm{2S_2F_2 + 5O_2 \ \xrightarrow{NO_2}\ SOF_4 + 3SO_3 }$