Thiothionyl fluoride
Chemical compound
From Wikipedia, the free encyclopedia
Thiothionyl fluoride is a chemical compound of fluorine and sulfur, with the chemical formula S=SF2. It is an isomer of disulfur difluoride (difluorodisulfane) FâSâSâF.
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| Names | |
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| IUPAC name
difluoro(sulfanylidene)-λ4-sulfane | |
| Other names
Sulphur(IV) sulfide difluoride Thiosulfinic difluoride | |
| 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·molâ1 |
| Appearance | colorless gas |
| Melting point | â164.6 °C (â264.3 °F; 108.5 K) |
| Boiling point | â10.6 °C (12.9 °F; 262.5 K) |
| Related compounds | |
Related compounds |
Thionyl fluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
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]
- S2Cl2 + 2 KF â S=SF2 + 2 KCl
Another possible preparation is by the reaction of nitrogen trifluoride with sulfur.[1]
- NF3 + 3 S â S=SF2 + NSF
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:
Properties
Thiothionyl fluoride is a colorless gas.[2] At high temperatures and pressures, it decomposes into sulfur tetrafluoride and sulfur.[2]
- 2 S=SF2 â SF4 + 3 S
With hydrogen fluoride, it forms sulfur tetrafluoride and hydrogen sulfide.[5]
- S=SF2 + 2 HF â SF4 + H2S
It condenses with sulfur difluoride at low temperatures to yield 1,3-difluoro-trisulfane-1,1-difluoride.
- S=SF2 + SF2 â FSâSâSF3[6]