Cobalt(III) fluoride
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| Cobalt(III) fluoride | |
|---|---|
| Image:Cobalt(III) fluoride.jpg | |
| Systematic name | Cobalt(III) fluoride |
| Other names | Cobalt trifluoride Cobaltic fluoride Cobalt fluoride Cobaltic trifluoride |
| Molecular formula | CoF3 |
| Molar mass | 115.93 g/mol |
| Density | 3.88 g/cm3 |
| Melting point | 926 °C |
| CAS number | [10026-18-3] |
| Disclaimer and references | |
Cobalt(III) fluoride is the chemical compound with the formula CoF3. This highly reactive, hygroscopic brown solid is used to synthesize organofluorine compounds.[1] CoF3 is a powerful fluorinating agent, the product being CoF2.
CoF3 is prepared in the laboratory by treating CoCl2 with fluorine at 250 °C:[2]
- CoCl2 + 3/2 F2 → CoF3 + Cl2
This conversion is a redox reaction, Co2+ is converted to Co3+. Fluorine is a powerful oxidant, so strong that it oxidizes chloride to chlorine.
CoF3 is hygroscopic and can be converted to the anion [CoF6]3-, a rare example of a high-spin, octahedral cobalt(III) complex.
Used as slurry, CoF3 converts hydrocarbons to the perfluorocarbons:
- 2CoF3 + R-H → CoF2 + R-F + HF
Such reactions are accompanied by rearrangements.[1] The related reagent KCoF4 is more selective.[3]
[edit] References
- ^ a b Coe, P. L. "Cobalt(III) Fluoride" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. DOI: 10.1002/047084289.
- ^ Priest, H. F. “Anhydrous Metal Fluorides” Inorganic Syntheses McGraw-Hill: New York, 1950; Vol. 3, pages 171-183.
- ^ Coe, P. L. "Potassium Tetrafluorocobaltate(III)" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. DOI: 10.1002/047084289.
[edit] External links
- National Pollutant Inventory - Cobalt fact sheet
- National Pollutant Inventory - Flouride and compounds fact sheet
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