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	165641
UNII	M372NC1A3B Y
UN number	UN2923
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	126.94 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 (ΔfHo298)	−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).
Y  (what is YN ?)
Infobox references

Vanadium(IV) fluoride (VF₄) is an inorganic compound of vanadium and fluorine. It is paramagnetic yellow-brown solid that is very hygroscopic. Unlike the corresponding vanadium tetrachloride, the tetrafluoride is not volatile because it adopts a polymeric structure. It decomposes before melting.

VF₄ can be prepared by treating VCl₄ with HF:

It was first prepared in this way.

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

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.