Vanadium Tetrafluoride

Vanadium(IV) fluoride
Names
	IUPAC name vanadium tetrafluoride
Identifiers
CAS Number	10049-16-8;
3D model (JSmol)	Interactive image;
ChemSpider	11226730 ;
EC Number	233-171-7;
PubChem CID	44717705;
UNII	M372NC1A3B ;
UN number	UN2923
	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
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).
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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.^[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]