Chromium(II) bromide

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). 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: 26–35. doi:10.1002/9780470132418.ch4.

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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). 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: 26–35. doi:10.1002/9780470132418.ch4.

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