Vanadium(II) chloride

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Vanadium(II) chloride
Vanadium(II) chloride
General
Systematic name Vanadium(II) chloride
Other names Vanadous chloride
Molecular formula VCl2
Molar mass 121.85 g/mol
Appearance pale green solid
CAS number [10580-52-6]
Properties
Density and phase 3.230 g/cm3, solid
Solubility in water soluble
Melting point 1350 °C (? K)
ΔHf -460 kJ/mol
Structure
Coordination
geometry
octahedral
Crystal structure CdI2
Hazards
MSDS External MSDS
Main hazards Reacts with oxygen rapidly
NFPA 704
R/S statement R: 20/21/22-34
S: 26-27-36/37/39-45
RTECS number YW1575000
Supplementary data page
Structure and
properties
n, εr, etc.
Thermodynamic
data
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Other anions VBr2
VI2
Other cations MnCl2
CrCl2
Related compounds VCl3
VCl4,
TiCl3
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Vanadium(II) chloride is VCl2. It is the most reduced vanadium chloride known. The species has the d3 configuration, with a quartet ground state, akin to Cr(III).

This salt-like solid has a polymeric structure. The other dihalides are also known, and VBr2 and VI2 are structurally and chemically similar to the dichloride. It is prepared by thermal decomposition of VCl3 to volatile VCl4, leaving a residue of VCl2.

Vanadium dichloride is a powerful reducing species, being able to reduce sulfoxides to sulfides, organic azides to amines, as well as reductively coupling some alkyl halides. Some derivatives have been shown to reduce nitrogen to hydrazine and ammonia.

VCl2 dissolves in water to give the ion [V(H2O)6]2+; evaporation of such solutions produced crystals of [V(H2O)6]Cl2 can be obtained.

External links

References

  • Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
  • Young, R. C.; Smith, M. E. "Vanadium(II) Chloride" Inorganic Syntheses volume IV, page 126-127, 1953.

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