Names | |
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IUPAC name
difluoro(sulfanylidene)-λ4-sulfane
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Other names
Sulphur(IV) sulfide difluoride
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Identifiers | |
3D model (
JSmol)
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ChemSpider | |
PubChem
CID
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CompTox Dashboard (
EPA)
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Properties | |
S=SF2 | |
Molar mass | 102.12 g·mol−1 |
Appearance | colorless gas |
Melting point | −164.6 °C (−264.3 °F; 108.5 K) |
Boiling point | −10.6 °C (12.9 °F; 262.5 K) |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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Thiothionyl fluoride is a chemical compound of fluorine and sulfur, with the chemical formula S=SF2. It is an isomer of disulfur difluoride (difluorodisulfane) F−S−S−F.
Thiothionyl fluoride can be obtained from the reaction between disulfur dichloride with potassium fluoride at about 150 °C or with mercury(II) fluoride at 20 °C. [1] [2][ clarification needed]
Another possible preparation is by the reaction of nitrogen trifluoride with sulfur. [1]
It also forms from disulfur difluoride when in contact with alkali metal fluorides. [3]
S=SF2 can also be synthesized with the reaction of potassium fluorosulfite and disulfur dichloride:
Thiothionyl fluoride is a colorless gas. [2] At high temperatures and pressures, it decomposes into sulfur tetrafluoride and sulfur. [2]
With hydrogen fluoride, it forms sulfur tetrafluoride and hydrogen sulfide. [5]
It condenses with sulfur difluoride at low temperatures to yield 1,3-difluoro-trisulfane-1,1-difluoride.