VANADIUM PENTAFLUORIDE Property

Melting point:

19.5°

Boiling point:

bp 47.9°

Density 

d419.5 2.502

solubility 

reacts with H2O

form 

colorless liquid

color 

colorless

Water Solubility 

hydrolyzed in H2O, dilute alkali; soluble anhydrous HF [MER06]

crystal system

Nogata

Space group

Pmcn

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.54	1.672	0.753	90	90	90	0.6799

Safety

RIDADR 

2922

HazardClass 

8

PackingGroup 

I

HS Code 

2826199090

Hazard and Precautionary Statements (GHS)

VANADIUM PENTAFLUORIDE Chemical Properties,Usage,Production

Chemical Properties

liquid; etches glass slowly at room temp; appreciable vapor pressure at room temp; enthalpy of vaporization 44.52 kJ/mol; enthalpy of fusion 49.96 kJ/mol [CRC10] [MER06]

Synthesis

A small nickel or platinum boat containing VF 4 is placed in a nickel tube and gradually heated to 650°C in a stream of dry N2 . The exit gases are collected in a large-diameter quartz trap maintained at —78°C. The trap is attached to a drying tube with anhydrous KF to exclude atmospheric moisture. The heating process must be effected slowly, since otherwise the unreacted VF4 is blown out of the reaction tube. The product is allowed to cool in a nitrogen stream and the VF5 is discharged directly from the gas trap into a storage container. A greenish-yellowish residue (VF4) remains in the boat. The yield is almost quantitative.

storage

The product is stored in sealed iron, nickel, copper or platinum containers.