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Vanadium(II) chloride

Vanadium(II) chloride

IUPAC name	Vanadium(II) chloride
Other names	Vanadous chloride
Identifiers
CAS number	10580-52-6
RTECS number	YW1575000
Properties
Molecular formula	VCl₂
Molar mass	121.85 g/mol
Appearance	pale green solid
Density	3.230 g/cm³, solid
Melting point	1350 °C (? K)
Solubility in water	soluble
Structure
Crystal structure	CdI₂
Coordination geometry	octahedral
Hazards
Main hazards	Reacts with oxygen rapidly
R-phrases	20/21/22-34
S-phrases	26-27-36/37/39-45
Related Compounds
Other anions	VCl₃ VCl₄
Other cations	MnCl₂ CrCl₂ 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).

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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.

References

The references in this article would be clearer with a different or consistent style of citation, footnoting, or external linking.

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.

Categories: Vanadium compounds | Chlorides | Metal halides