copperperoxide

Copper peroxide, or copper(II) peroxide, is an inorganic compound with the formula CuO2. It is a peroxide form of copper in the +2 oxidation state. Unlike more common copper oxides, copper peroxide is not readily isolable under ordinary conditions; it tends to decompose to copper(II) oxide (CuO) and molecular oxygen (O2).

In the literature, copper(II) peroxide is described as a transient species that may exist as a polymeric network of copper centers bridged by peroxide ligands in nonaqueous media. It is typically sensitive to heat and moisture, and is often observed only under carefully controlled conditions.

Because it is not easily isolated, copper peroxide is usually generated in situ in solution or as part of oxidation systems, for example by oxidation of copper(I) species with peroxide donors, or by treating copper(II) salts with peroxides under low temperatures. Attempted isolation may lead to rapid decomposition to CuO and O2.

As a reactive intermediate, copper peroxide is discussed in studies of copper–oxygen chemistry and peroxide activation. It is not used as a practical reagent in most synthetic applications due to instability. Its behavior depends on ligands, solvent, and temperature.

Peroxides can be strong oxidizers and may pose hazards if concentrated. Copper-containing solids and solutions should be handled with standard laboratory precautions. See also copper oxide, peroxide, copper salts.