Disulfur difluoride

Disulfur difluoride

Names
IUPAC name fluorosulfanyl thiohypofluorite
Identifiers
CAS Number	13709-35-8
ChemSpider	109926
Jmol interactive 3D	Image
PubChem	123323
InChI InChI=1S/F2S2/c1-3-4-2
SMILES FSSF
Properties
Chemical formula	S2F2
Molar mass	102.127 g/mol
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:^[1]

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

Synthesis

Silver(II) fluoride can fluorinate sulfur in a strictly dry container, and the reaction produces FS-SF:^[2]

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

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

$\rm \ 2 KSO_2F + S_2Cl_2 \rightarrow S=SF_2 + 2 KCl + 2 SO_2$^[3]

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:

$\mathrm{2S_2F_2 + 5O_2 \ \xrightarrow{NO_2}\ SOF_4 + 3SO_3 }$^[4][5][6]

References

1. Davis, R.Wellington (1986). "The microwave spectrum of the pyramidal isomer of disulfur difluoride: S=SF2". Journal of Molecular Spectroscopy 116 (2): 371. doi:10.1016/0022-2852(86)90134-7.
2. Davis, R.Wellington; Firth, Steven (1991). "The microwave spectrum of the chain isomer of disulfur difluoride: FS-SF". Journal of Molecular Spectroscopy 145 (2): 225. doi:10.1016/0022-2852(91)90109-N.
3. 张青莲. 《无机化学丛书》第五卷：氧、硫、硒分族 (in Chinese). Beijing: Science Press. p. 179. ISBN 7-03-002238-6.
4. Справочник химика / Редкол.: Никольский Б.П. и др.. — 3-е изд., испр. — Л.: Химия, 1971. — Т. 2. — 1168 с. (Russian)
5. Химическая энциклопедия / Редкол.: Кнунянц И.Л. и др.. — М.: Советская энциклопедия, 1995. — Т. 4. — 639 с. — ISBN 978-5-85270-092-6 (Russian)
6. Лидин Р.А. и др. Химические свойства неорганических веществ: Учеб. пособие для вузов. — 3-е изд., испр. — М.: Химия, 2000. — 480 с. — ISBN 5-7245-1163-0 (Russian)