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(Top) 1 Structure 2 Synthesis 3 Reactions 4 References

Disulfur difluoride

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Disulfur difluoride

Sulfur, S

Fluorine, F

Names

IUPAC name

fluorosulfanyl thiohypofluorite

Other names

Difluorodisulfane^[1]

Identifiers

CAS Number

13709-35-8

3D model (JSmol)

Interactive image

ChemSpider

109926

PubChem CID

123323

CompTox Dashboard (EPA)

DTXSID60160058

InChI

InChI=1S/F2S2/c1-3-4-2

SMILES

FSSF

Properties

Chemical formula

S₂F₂

Molar mass

102.127 g/mol

Melting point

−133 °C (−207 °F; 140 K)

Boiling point

15 °C (59 °F; 288 K)

Related compounds

O₂F₂

H₂S₂

S₂Cl₂

S₂Br₂

S₂I₂

SF₂

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 an inorganic compound with the chemical formula S₂F₂. It is a halideofsulfur.

Structure[edit]

Disulfur difluoride has a chain structure F−S−S−F. The angle between the F^a−S−S and S−S−F^b planes is 87.9°, while the angles of F^a−S−S and S−S−F^b are equivalent, and are equal to 108.3°. Both S−F bonds are equivalent and their length is 163.5 pm, while the length of the S−S bond is 189 pm. This structure is referred to as gauche, and is similar to H₂O₂.

There is a branched isomer of disulfur difluoride, thiothionyl fluoride, with the structure S=SF₂.

Synthesis[edit]

Silver(II) fluoride can fluorinate sulfur in a strictly dry container at 125 °C (257 °F; 398 K), and the reaction produces FS−SF:^[2]

S₈ + 8 AgF₂ → 4 S₂F₂ + 8 AgF

Reactions[edit]

Disulfur difluoride undergoes intramolecular rearrangement in the presence of fluoridesofalkali metals, yielding the isomer S=SF₂:^[3]

FS−SF → S=SF₂

Decomposing to sulfur tetrafluoride and sulfur when heated to 180 °C:

2 S₂F₂ → SF₄ + 3 S

Hydrolysis:

2 S₂F₂ + 2 H₂O → SO₂ + 3 S + 4 HF

Reacting with sulfuric acid at 80 °C:

S₂F₂ + 3 H₂SO₄ → 5 SO₂ + 2 HF + 2 H₂O

Reacting with sodium hydroxide:

2 S₂F₂ + 6 NaOH → Na₂SO₃ + 3 S + 4 NaF + 3 H₂O

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

2 S₂F₂ + 5 O₂ → SOF₄ + 3 SO₃^[4]^[5]^[6]

References[edit]

^ "Difluorodisulfane".

^ 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.

^ Davis, R.Wellington (1986). "The microwave spectrum of the pyramidal isomer of disulfur difluoride: S=SF2". Journal of Molecular Spectroscopy. 116 (2): 371–383. doi:10.1016/0022-2852(86)90134-7.

^ Справочник химика / Редкол.: Никольский Б.П. и др.. — 3-е изд., испр. — Л.: Химия, 1971. — Т. 2. — 1168 с. (in Russian)

^ Химическая энциклопедия / Редкол.: Кнунянц И.Л. и др.. — М.: Советская энциклопедия, 1995. — Т. 4. — 639 с. — ISBN 978-5-85270-092-6 (in Russian)

^ Лидин Р.А. и др. Химические свойства неорганических веществ: Учеб. пособие для вузов. — 3-е изд., испр. — М.: Химия, 2000. — 480 с. — ISBN 978-5-7245-1163-6 (in Russian)