Cobalt(II) bromide

In its anhydrous form, it is a green solid that is soluble in water, used primarily as a catalyst in some processes.

When anhydrous, cobalt(II) bromide appears as green crystals.

It is hygroscopic and eventually forms the hexahydrate in air,[1] which appears as red-purple crystals.

[4] Cobalt(II) bromide can be prepared as a hydrate by the reaction of cobalt hydroxide with hydrobromic acid: The classical coordination compound bromopentaamminecobalt(III) bromide is prepared by oxidation of an aqueous solution of cobalt(II) bromide and ammonia.

[5] Triphenylphosphine complexes of cobalt(II) bromide have been used as a catalysts in organic synthesis.

NFPA 704 four-colored diamond Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform Flammability 0: Will not burn. E.g. water Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium Special hazards (white): no code