Chemistry:Vanadium(III) fluoride
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| Names | |
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| Other names
Vanadium fluoride, Vanadium trifluoride
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
PubChem CID
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| Properties | |
| F3V | |
| Molar mass | 107.9367 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] | |
a = 5.17 Å, c = 13.402 Å[2] α = 90°, β = 90°, γ = 120°
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| Hazards | |
| GHS pictograms |   [3]
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| GHS Signal word | Danger |
| H301, H311, H331, H314[3] | |
| P261, P280, P301+310, P305+351+338, P310[3] | |
| NFPA 704 (fire diamond) | |
| Related compounds | |
Other anions
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Vanadium(III) chloride Vanadium(III) oxide Vanadium(III) nitride |
Other cations
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Vanadium(IV) fluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 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.[4] Similar to other transition-metal fluorides (such as MnF2), it exhibits magnetic ordering at low temperatures (e.g. V2F6.4H2O orders below 12 K[5]).
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.[citation needed] 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 Lide, David R., ed (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
- ↑ 2.0 2.1 2.2 2.3 Douglas, Bodie E.; Ho, Shih-Ming (2007). Structure and Chemistry of Crystalline Solids. New York: Springer Science+Business Media, Inc.. p. 102. ISBN 978-0-387-26147-8. https://books.google.com/books?id=hYRCAAAAQBAJ&pg=PA102.
- ↑ 3.0 3.1 3.2 Sigma-Aldrich Co., Vanadium(III) fluoride. Retrieved on 2014-06-25.
- ↑ 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
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