Disulfur difluoride

Disulfur difluoride
Names
	IUPAC name fluorosulfanyl thiohypofluorite
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
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]

{\ce {FS-SF->[{} \atop {\ce {KF}}]{\underset {Disulfur\ difluoride}{S=SF_{2}}}}}

Synthesis

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

{\ce {{S8}+{\underset {Silver(II)\ fluoride}{8AgF2}}->[{} \atop {\ce {398K}}]{4S2F2}+8AgF}}

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

{\ce {2 KSO2F + S2Cl2 -> S=SF2 + 2KCl + 2 SO2}}

[3]

Reactions

Decomposing to sulfur tetrafluoride and sulfur when heated:

{\ce {2S2F2->[{} \atop {\ce {180^{\circ }C}}]\ {\underset {sulfur\ tetrafluoride}{SF4}}+3S}}

Treated with water:

{\ce {2S2F2 + 2H2O -> SO2 + 3S + 4HF}}

Reacting with sulfuric acid:

{\ce {{S2F2}+{\underset {sulfuric\ acid}{3H2SO4}}->[{} \atop {\ce {80^{\circ }C}}]{5SO2}+{2HF}+2H2O}}

Reacting with sodium hydroxide:

{\ce {2S2F2 + 6NaOH -> Na2SO3 + 3S + 4NaF + 3H2O}}

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

{\ce {{2S2F2}+5O2->[{} \atop {\overset {}{\ce {NO_{2}}}}]{SOF4}+3SO3}}

[4][5][6]

Condensing with sulfur difluoride at low temperatures to yield 1,3-Difluoro-trisulfane-1,1-difluoride.

SSF₂ + SF₂ → FSSSF₃[7]

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References

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.
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.
张青莲 (1991). 《无机化学丛书》第五卷：氧、硫、硒分族 (in Chinese). Beijing: Science Press. p. 179. ISBN 978-7-03-002238-7.
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)
Lösking, O.; Willner, H.; Baumgärtel, H.; Jochims, H. W.; Rühl, E. (November 1985). "Chalkogenfluoride in niedrigen Oxydationsstufen. X Thermochemische Daten und Photoionisations-Massenspektren von SSF2, FSSF, SF3SF und SF3SSF". Zeitschrift für anorganische und allgemeine Chemie. 530 (11): 169–177. doi:10.1002/zaac.19855301120.

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[1] 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.

[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 (1991). 《无机化学丛书》第五卷：氧、硫、硒分族 (in Chinese). Beijing: Science Press. p. 179. ISBN 978-7-03-002238-7.

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

[5] Химическая энциклопедия / Редкол.: Кнунянц И.Л. и др.. — М.: Советская энциклопедия, 1995. — Т. 4. — 639 с. — ISBN 978-5-85270-092-6 (in 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 978-5-7245-1163-6 (in Russian)

[7] Lösking, O.; Willner, H.; Baumgärtel, H.; Jochims, H. W.; Rühl, E. (November 1985). "Chalkogenfluoride in niedrigen Oxydationsstufen. X Thermochemische Daten und Photoionisations-Massenspektren von SSF2, FSSF, SF3SF und SF3SSF". Zeitschrift für anorganische und allgemeine Chemie. 530 (11): 169–177. doi:10.1002/zaac.19855301120.