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Chromium(II) bromide
Names
	IUPAC name Chromium(II) bromide
	Other names Chromium dibromide, Chromium bromide, Chromous bromide
Identifiers
CAS Number	10049-25-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	9249842;
PubChem CID	21908600;
UNII	6S9M6JI7W3 ;
CompTox Dashboard (EPA)	DTXSID90619903 ;
	InChI InChI=1S/2BrH.Cr/h2*1H;/q;;+2/p-2 Key: XZQOHYZUWTWZBL-UHFFFAOYSA-L;
	SMILES [Cr+2].[Br-].[Br-];
Properties
Chemical formula	CrBr2
Molar mass	211.804 g·mol−1
Appearance	White solid
Density	4.236 g/cm3
Melting point	842 °C (1,548 °F; 1,115 K)
Solubility in water	soluble, exothermal blue solution
Structure
Crystal structure	monoclinic
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chromium(II) bromide is the inorganic compound with the chemical formula CrBr₂. Like many metal dihalides, CrBr₂ adopts the "cadmium iodide structure" motif, i.e., it features sheets of octahedral Cr(II) centers interconnected by bridging bromide ligands. It is a white solid that dissolves in water to give blue solutions that are readily oxidized by air.

Synthesis and reactions

It can be prepared by reduction of chromium(III) bromide with hydrogen gas for 6–10 hours at 350-400 °C, cogenerating hydrogen bromide:^[2]

2 CrBr₃ + H₂ → 2 CrBr₂ + 2 HBr

Treatment of chromium powder with concentrated hydrobromic acid gives a blue hydrated chromium(II) bromide, which can be converted to a related acetonitrile complex.^[3]

Cr + n H₂O + 2 HBr → CrBr₂(H₂O)_n + H₂

References

^ ^a ^b ^c ^d ^e Perry, Dale L. (2011). Handbook of Inorganic Compounds, Second Edition. Boca Raton, Florida: CRC Press. p. 120. ISBN 978-1-43981462-8. Retrieved 2014-01-10.
^ Brauer, Georg (1965) [1962]. Handbuch Der Präparativen Anorganischen Chemie [Handbook of Preparative Inorganic Chemistry] (in German). Vol. 2. Stuttgart; New York, New York: Ferdinand Enke Verlag; Academic Press, Inc. p. 1341. ISBN 978-0-32316129-9. Retrieved 2014-01-10.
^ Holah, David G.; Fackler, John P. (1967). "Chromium(II) Salts and Complexes". Inorganic Syntheses. Vol. 10. pp. 26–35. doi:10.1002/9780470132418.ch4. ISBN 9780470131695.

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[Handbook-1] Perry, Dale L. (2011). Handbook of Inorganic Compounds, Second Edition. Boca Raton, Florida: CRC Press. p. 120. ISBN 978-1-43981462-8. Retrieved 2014-01-10.

[German-2] Brauer, Georg (1965) [1962]. Handbuch Der Präparativen Anorganischen Chemie [Handbook of Preparative Inorganic Chemistry] (in German). Vol. 2. Stuttgart; New York, New York: Ferdinand Enke Verlag; Academic Press, Inc. p. 1341. ISBN 978-0-32316129-9. Retrieved 2014-01-10.

[3] Holah, David G.; Fackler, John P. (1967). "Chromium(II) Salts and Complexes". Inorganic Syntheses. Vol. 10. pp. 26–35. doi:10.1002/9780470132418.ch4. ISBN 9780470131695.

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