Vanadium tetrafluoride

Vanadium(IV) fluoride

Names

IUPAC name

vanadium tetrafluoride

Identifiers

CAS Number

10049-16-8

3D model (JSmol)

Interactive image

ChemSpider

11226730^Y

ECHA InfoCard

100.030.143

EC Number

233-171-7

PubChem CID

44717705

UNII

M372NC1A3B^Y

UN number

UN2923

CompTox Dashboard (EPA)

DTXSID50894991

InChI

InChI=1S/4FH.V/h4*1H;/q;;;;+4/p-4^Y
Key: JTWLHYPUICYOLE-UHFFFAOYSA-J^Y
InChI=1/4FH.V/h4*1H;/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^[1]

Odor

Odorless

Density

3.15 g/cm³ (20 °C)^[1]
2.975 g/cm³ (23 °C)^[2]

Melting point

325 °C (617 °F; 598 K)
at 760 mmHg decomposes^[1]

Boiling point

Sublimes^[1]

Solubility in water

Very soluble^[1]

Solubility

Soluble in acetone, acetic acid
Very slightly soluble in SO₂Cl₂, alcohols, CHCl₃^[2]

Structure

Crystal structure

Monoclinic, mP10

Space group

P2₁/c, No. 14

Thermochemistry

Std molar
entropy (S^⦵₂₉₈)

126 J/mol·K^[3]

Std enthalpy of
formation (Δ_fH^⦵₂₉₈)

−1412 kJ/mol^[3]

Gibbs free energy (Δ_fG^⦵)

−1312 kJ/mol^[3]

Hazards

Occupational safety and health (OHS/OSH):

Eye hazards

Causes serious damage

Skin hazards

Causes burns

GHS labelling:^[4]

Pictograms

Signal word

Danger

Hazard statements

H300, H314, H330

Precautionary statements

P260, P301+P310, P303+P361+P353, P304+P340, P305+P351+P338, P320, P330, P405, P501

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Y verify (what is ^YN ?)

Infobox references

Chemical compound

Vanadium(IV) fluoride (VF₄) 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.^[5] 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.^[6]

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

2 VF₄ → VF₃ + VF₅

Structure

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.^[7]

V⁴⁺; F⁻

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". chemister.ru. Retrieved 2014-06-25.
^ "Vanadium(IV) fluoride, 95%". alfa.com. Alfa Aesar. Retrieved 2014-06-25.
^ Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, p. 716, ISBN 0-471-19957-5
^ 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