Potassium tetraperoxochromate(V)
Potassium peroxochromate, potassium tetraperoxochromate, or simply potassium perchromate, is an inorganic compound having the chemical formula. It is a red-brown paramagnetic solid. It is the potassium salt of tetraperoxochromate, one of the few examples of chromium in the +5 oxidation state and one of the rare examples of a complex stabilized only by peroxide ligands. Heating this compound releases singlet oxygen.
Preparation
Potassium peroxochromate is prepared starting from chromium trioxide, excess potassium hydroxide, and 30% hydrogen peroxide :Hydrogen peroxide is added at temperatures below :
The intermediate tetraperoxochromate is reduced by hydrogen peroxide, forming tetraperoxochromate:
Thus, the overall reaction is:
The compound decomposes spontaneously at higher temperatures but may be stored in sealed containers for extended periods.