Vanadium(III) fluoride

Vanadium(III) fluoride
Names
	Other names Vanadium fluoride, Vanadium trifluoride
Identifiers
CAS Number	10049-12-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	16057827 ;
ECHA InfoCard	100.030.141
PubChem CID	66230;
UNII	O3S3Z32R8P ;
CompTox Dashboard (EPA)	DTXSID50894890 ;
	show InChI
	show SMILES
Properties
Chemical formula	F3V
Molar mass	107.9367 g·mol−1
Appearance	Yellow-green powder (anhydrous); Green powder (trihydrate)
Density	3.363 g/cm3
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
Boiling point	Sublimes
Solubility in water	Insoluble
Solubility	Insoluble in EtOH
Magnetic susceptibility (χ)	2.757·10−3 cm3/mol
Structure
Crystal structure	Rhombohedral, hR24
Space group	R3c, No. 167
Point group	3 2/m
Lattice constant	a = 5.17 Å, c = 13.402 Å α = 90°, β = 90°, γ = 120°
Hazards
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H301, H311, H331, H314
GHS precautionary statements	P261, P280, P301+310, P305+351+338, P310
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).
	(what is ?)
	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[]

^ Jump up to: ^a ^b ^c ^d ^e ^f Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
^ Jump up to: ^a ^b ^c ^d 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.
^ Jump up to: ^a ^b ^c 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

Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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[crc-1] Jump up to: ^a ^b ^c ^d ^e ^f Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.

[sccs-2] Jump up to: ^a ^b ^c ^d 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.

[sigma-3] Jump up to: ^a ^b ^c Sigma-Aldrich Co., Vanadium(III) fluoride. Retrieved on 2014-06-25.

[4] Sturm, B. J.; Sheridan, C. W. "Vanadium(III) Fluoride" Inorganic Syntheses 1963; Vol. 7, pages 52-54. ISBN 0-88275-165-4.

[5] S. Nakhal et al., Z. Kristallogr. 228, 347 (2013).doi:10.1524/zkri.2013.1664

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