Chromium(II) bromide is the inorganic compound with the chemical formula CrBr<sub>2</sub>. Like many metal dihalides, CrBr<sub>2</sub> 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 6âÂÂ10 hours at 350-400 ðC, cogenerating hydrogen bromide:
Treatment of chromium powder with concentrated hydrobromic acid gives a blue hydrated chromium(II) bromide, which can be converted to a related acetonitrile complex.