Vanadium(III) fluoride
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| Names | |
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| Other names
Vanadium fluoride, Vanadium trifluoride
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| Identifiers | |
10049-12-4  |
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| ChemSpider | 16057827  |
| Jmol 3D model | Interactive image |
| PubChem | 66230 |
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| Properties | |
| F3V | |
| Molar mass | 107.94 g·mol−1 |
| Appearance | Yellow-green powder (anhydrous) Green powder (trihydrate)[1] |
| Density | 3.363 g/cm3[1] |
| Melting point | 1,395 °C (2,543 °F; 1,668 K) at 760 mmHg (anhydrous) ~ 100 °C (212 °F; 373 K) at 760 mmHg (trihydrate) decomposes[1] |
| Boiling point | Sublimes |
| Insoluble[1] | |
| Solubility | Insoluble in EtOH[1] |
| 2.757·10−3 cm3/mol[1] | |
| Structure | |
| Rhombohedral, hR24[2] | |
| R3c, No. 167[2] | |
| 3 2/m[2] | |
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a = 5.17 Å, c = 13.402 Å[2]
α = 90°, β = 90°, γ = 120°
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| Vapor pressure | {{{value}}} |
| Related compounds | |
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Other anions
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Vanadium(III) chloride Vanadium(III) oxide Vanadium(III) nitride |
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Other cations
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Vanadium(IV) fluoride |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 verify (what is ?) |
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| Infobox references | |
Vanadium(III) fluoride is the chemical compound with the formula VF3. This yellow-green, refractory solid is obtained in a two-step procedure from V2O3.[3] Similar to other transition-metal fluorides (such as MnF2), it exhibits magnetic ordering at low temperatures (e.g. V2F6.4H2O orders below 12 K[4]).
Preparation
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. VF3 is a crystalline solid with 6 coordinate vanadium atoms with bridging fluorine atoms. The magnetic moment indicates the presence of two unpaired electrons.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Sturm, B. J.; Sheridan, C. W. "Vanadium(III) Fluoride" Inorganic Syntheses 1963; Vol. 7, pages 52-54. ISBN 0-88275-165-4.
- ↑ S. Nakhal et al., Z. Kristallogr. 228, 347 (2013).doi:10.1524/zkri.2013.1664
- Lua error in package.lua at line 80: module 'strict' not found.
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