CuBr2

CuBr2, or copper(II) bromide, is an inorganic compound consisting of copper in the +2 oxidation state coordinated to two bromide ligands. It appears as a dark brown to red-brown crystalline solid and is typically encountered in an anhydrous form, though hydrated forms can be obtained under certain conditions. The compound is moisture-sensitive and can slowly hydrolyze in the presence of water.

CuBr2 can be prepared by direct combination of copper metal with bromine, Cu + Br2 → CuBr2, or by oxidation of copper(I) bromide with bromine. In the solid state, CuBr2 adopts a polymeric structure built from copper(II) centers linked by bromide bridges; in solution, it forms aquated copper(II) species and bromide-containing complexes.

In aqueous or bromide-rich media, CuBr2 forms a range of copper(II) bromide complexes, and its solubility in water is limited compared with some other copper salts. It is more commonly handled as a reagent in inorganic and organic synthesis, where it serves as a source of bromine or as a catalyst/oxidant in certain transformations. It can participate in reactions such as radical bromination and various oxidation or coupling processes under appropriate conditions, often in the presence of light or heat.

Safety: Copper(II) bromide is corrosive and toxic if ingested or inhaled; it can irritate skin and eyes. It should be handled in a fume hood with appropriate protective equipment. Waste disposal should follow regulations for copper salts and bromine compounds.