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| Names | |||
|---|---|---|---|
| IUPAC name Thionyl fluoride | |||
| Identifiers | |||
3D model (JSmol) | |||
| ChemSpider |
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| ECHA InfoCard | 100.029.088 | ||
| EC Number |
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| UNII | |||
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| Properties | |||
| SOF2 | |||
| Molar mass | 86.06 g·mol−1 | ||
| Appearance | colorless gas | ||
| Melting point | −110.5 °C (−166.9 °F; 162.7 K) | ||
| Boiling point | −43.8 °C (−46.8 °F; 229.3 K) | ||
| hydrolysis | |||
| Solubility | soluble in ethanol, ether, benzene | ||
| Vapor pressure | 75.7 kPa (-50 °C)[1] | ||
| Structure | |||
| trigonal pyramidal | |||
| Thermochemistry[2][better source needed] | |||
Std molar entropy(S⦵298) | 278.6 J/(mol·K) | ||
Std enthalpy of formation(ΔfH⦵298) | −715 kJ/mol | ||
Std enthalpy of combustion(ΔcH⦵298) | 56.8 J/(mol·K) | ||
| Hazards | |||
| GHS labelling: | |||
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| Danger | |||
| H300,H310,H314,H330 | |||
| P260,P262,P264,P270,P271,P280,P284,P301+P310,P301+P330+P331,P302+P350,P303+P361+P353,P304+P340,P305+P351+P338,P310,P320,P321,P322,P330,P361,P363,P403+P233,P405,P501 | |||
| Related compounds | |||
Related oxohalides | Thionyl chloride Thionyl bromide | ||
Related compounds | Thiothionyl fluoride Nitrosyl fluoride Carbonyl fluoride | ||
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |||
Thionyl fluoride is theinorganic compound with theformulaSOF2. This colourless gas is mainly of theoretical interest, but it is a product of the degradation ofsulfur hexafluoride, an insulator in electrical equipment. The molecule adopts a distorted pyramidal structure, with Cssymmetry. The S-O and S-F distances are 1.42 and 1.58Å, respectively. The O-S-F and F-S-F angles are 106.2 and 92.2°, respectively.[3][page needed]
Thionyl fluoride can be produced by the reaction ofthionyl chloride with fluoride sources such asantimony trifluoride.[4][3]: 542
Alternatively, it arises via the fluorination ofsulfur dioxide:[3]: 542
Thionyl fluoride arises as a fleeting intermediate from the decomposition of sulfur hexafluoride as the result of electrical discharges which generatesulfur tetrafluoride. SF4 hydrolyzes to give thionyl fluoride, which in turn hydrolyzes further as described below.[5]
As expected from the behavior of the other thionyl halides, this compound hydrolyzes readily, givinghydrogen fluoride andsulfur dioxide:[3]: 542
In contrast to thionyl chloride and bromide, thionyl fluoride is not useful forhalogenation. The related derivative,sulfur tetrafluoride is however useful for that purpose.[citation needed]
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