Vanadium tetrafluoride

Vanadium(IV) fluoride
Names
	IUPAC name vanadium tetrafluoride
Identifiers
CAS Number	10049-16-8;
3D model (JSmol)	Interactive image;
ChemSpider	11226730 ;
ECHA InfoCard	100.030.143
EC Number	233-171-7;
PubChem CID	165641;
UNII	M372NC1A3B ;
UN number	UN2923
CompTox Dashboard (EPA)	DTXSID50894991 ;
	InChI InChI=1S/4FH.V/h41H;/q;;;;+4/p-4 Key: JTWLHYPUICYOLE-UHFFFAOYSA-J ; InChI=1/4FH.V/h41H;/q;;;;+4/p-4 Key: JTWLHYPUICYOLE-XBHQNQODAC;
	SMILES [V+4].[F-].[F-].[F-].[F-];
Properties
Chemical formula	F4V
Molar mass	126.9351 g·mol−1
Appearance	Lime green powder, hygroscopic
Odor	Odorless
Density	3.15 g/cm3 (20 °C); 2.975 g/cm3 (23 °C)
Melting point	325 °C (617 °F; 598 K) ; at 760 mmHg decomposes
Boiling point	Sublimes
Solubility in water	Very soluble
Solubility	Soluble in acetone, acetic acid; Very slightly soluble in SO2Cl2, alcohols, CHCl3
Structure
Crystal structure	Monoclinic, mP10
Space group	P21/c, No. 14
Thermochemistry
Std molar; entropy (So298)	126 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	−1412 kJ/mol
Gibbs free energy (ΔfG˚)	−1312 kJ/mol
Hazards
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H300, H330, H314, H318
GHS precautionary statements	P260, P301+310, P303+361+353, P304+340, P305+351+338, P320, P330, P405, P501
Eye hazard	Causes serious damage
Skin hazard	Causes burns
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Vanadium(IV) fluoride (V F₄) is an inorganic compound of vanadium and fluorine. It is paramagnetic yellow-brown solid that is very hygroscopic.^[2] Unlike the corresponding vanadium tetrachloride, the tetrafluoride is not volatile because it adopts a polymeric structure. It decomposes before melting.

Preparation and reactions

VF₄ can be prepared by treating VCl₄ with HF:

VCl₄ + 4 HF → VF₄ + 4 HCl

It was first prepared in this way.^[5]

It decomposes at 325 °C, undergoing disproportionation to the tri- and pentafluorides:^[2]

2 VF₄ → VF₃ + VF₅

Structure

V⁴⁺; F⁻

The structure of VF₄ is related to that of SnF₄. Each vanadium centre is octahedral, surrounded by six fluoride ligands. Four of the fluoride centers bridge to adjacent vanadium centres.^[6]

References

^ ^a ^b ^c ^d ^e Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
^ ^a ^b ^c ^d Kwasnik, W. (1963). Brauer, Georg (ed.). Handbook of Preparative Inorganic Chemistry (UK ed.). London: Academic Press. pp. 252–253.
^ ^a ^b ^c Anatolievich, Kiper Ruslan. "vanadium(IV) fluoride". http://chemister.ru. Retrieved 2014-06-25.
^ ^a ^b ^c "Vanadium(IV) fluoride, 95%". http://www.alfa.com. Alfa Aesar. Retrieved 2014-06-25.
^ Otto Ruff, Herbert Lickfett "Vanadinfluoride" Chemische Berichte 1911, vol. 44, pages 2539–2549. doi:10.1002/cber.19110440379
^ Becker S., Muller B. G. Vanadium Tetrafluoride, Angew. Chem. Intnl. Ed. Engl. 1990, vol. 29, page 406

WebElements
Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, ISBN 0-471-19957-5

[crc-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.

[hpic-2] Kwasnik, W. (1963). Brauer, Georg (ed.). Handbook of Preparative Inorganic Chemistry (UK ed.). London: Academic Press. pp. 252–253.

[chemister-3] Anatolievich, Kiper Ruslan. "vanadium(IV) fluoride". http://chemister.ru. Retrieved 2014-06-25.

[alfa-4] "Vanadium(IV) fluoride, 95%". http://www.alfa.com. Alfa Aesar. Retrieved 2014-06-25.

[5] Otto Ruff, Herbert Lickfett "Vanadinfluoride" Chemische Berichte 1911, vol. 44, pages 2539–2549. doi:10.1002/cber.19110440379

[6] Becker S., Muller B. G. Vanadium Tetrafluoride, Angew. Chem. Intnl. Ed. Engl. 1990, vol. 29, page 406

[1]

[2]

[3]

[4]

[5]

[6]