Vanadium(III) fluoride
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| Vanadium(III) fluoride | |
|---|---|
| Image:Vanadium(III) fluoride.jpg | |
| General | |
| Other names | vanadium trifluoride |
| Molecular formula | VF3 |
| Molar mass | 107.94 g/mol |
| Appearance | gray-green powder |
| CAS number | [10049-12-4] |
| Properties | |
| Density and phase | 3.363 g/cm3, solid |
| Solubility in water | insoluble |
| Melting point | 1406 °C |
| Boiling point | ? |
| Hazards | |
| EU classification | not listed |
| NFPA 704 |    |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Vanadium(III) fluoride is the chemical compound with the formula VF3. This gray-green, refractory solid is obtained in a two-step procedure from V2O3.[1] The first step entails conversion to the hexafluorovanadate(III) salt using ammonium bifluoride:
- V2O3 + 6 (NH4)HF2 → 2 (NH4)3VF6 + 3 H2O
In the second step, the hexafluorovanadate is thermally decomposed.
- (NH4)3VF6 → 3 NH3 + 3 HF + VF3
The thermal decomposition of ammonium salts is a relatively common method for the preparation of inorganic solids.
VF3 can also be prepared by treatment of V2O3 with HF.
[edit] References
- ^ Sturm, B. J.; Sheridan, C. W. Vanadium(III) Fluoride" Inorganic Syntheses 1963; Vol. 7, pages 52-54. ISBN 0-88275-165-4.
[edit] External links
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