Names | |
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IUPAC name
Chromium(II) bromide
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Other names
Chromium dibromide, Chromium bromide, Chromous bromide
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Identifiers | |
3D model (
JSmol)
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ChemSpider | |
PubChem
CID
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UNII | |
CompTox Dashboard (
EPA)
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Properties | |
CrBr2 | |
Molar mass | 211.804 g·mol−1 |
Appearance | White solid [1] |
Density | 4.236 g/cm3 [1] |
Melting point | 842 °C (1,548 °F; 1,115 K) [1] |
soluble, exothermal blue solution [1] | |
Structure | |
monoclinic [1] | |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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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.
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]
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]