Vanadium(III) fluoride

Vanadium(III) fluoride

Names
Other names Vanadium fluoride, Vanadium trifluoride
Identifiers
CAS Number	10049-12-4  N
3D model (JSmol)	Interactive image
ChemSpider	16057827  Y
ECHA InfoCard	100.030.141
PubChem CID	66230
UNII	O3S3Z32R8P  N
CompTox Dashboard (EPA)	DTXSID50894890
InChI InChI=1S/3FH.V/h3*1H;/q;;;+3/p-3 Y Key: PASVSMBJEYQYSN-UHFFFAOYSA-K Y InChI=1/3FH.V/h3*1H;/q;;;+3/p-3 Key: PASVSMBJEYQYSN-DFZHHIFOAM
SMILES [V+3].[F-].[F-].[F-]
Properties
Chemical formula	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
Solubility in water	Insoluble [1]
Solubility	Insoluble in EtOH [1]
Magnetic susceptibility (χ)	2.757·10−3 cm3/mol [1]
Structure
Crystal structure	Rhombohedral, hR24 [2]
Space group	R3c, No. 167 [2]
Point group	3 2/m [2]
Lattice constant	a = 5.17 Å, c = 13.402 Å [2] α = 90°, β = 90°, γ = 120°
Hazards
GHS labelling:
Pictograms	[3]
Signal word	Danger
Hazard statements	H301, H311, H314, H331 [3]
Precautionary statements	P261, P280, P301+P310, P305+P351+P338, P310 [3]
NFPA 704 (fire diamond)	3 0 2
Related compounds
Other anions	Vanadium(III) chloride Vanadium(III) oxide Vanadium(III) nitride
Other cations	Vanadium(IV) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N  verify  (what is  YN ?) Infobox references

Vanadium(III) fluoride is the chemical compound with the formula VF₃. It is a yellow-green crystalline solid with hexacoordinate vanadium atoms and bridging fluorine atoms. The magnetic moment indicates the presence of two unpaired electrons. 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

Vanadium(III) fluoride is obtained in a two-step procedure from V₂O₃. ^[5]

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.

It can also be prepared by treatment of V₂O₃ with HF.^{[ citation needed ]}

References

1. 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. 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.
3. Sigma-Aldrich Co., Vanadium(III) fluoride. Retrieved on 2014-06-25.
4. S. Nakhal et al., Z. Kristallogr. 228, 347 (2013). doi : 10.1524/zkri.2013.1664
5. Sturm, B. J.; Sheridan, C. W. "Vanadium(III) Fluoride" Inorganic Syntheses 1963; Vol. 7, pages 52-54. ISBN   0-88275-165-4.

General references

• Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. doi:10.1016/C2009-0-30414-6. ISBN   978-0-08-037941-8.