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Potassium tetraperoxochromate(V)

Chemical compound

|Potassium perchromate |Potassium peroxochromate |Poorly soluble (0 C) |Reacts (45 C)

Potassium peroxochromate, potassium tetraperoxochromate(V), 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(V), 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 (KOH), and 30% hydrogen peroxide (): :

Hydrogen peroxide is added at temperatures below -5 C: :

The intermediate tetraperoxochromate(VI) is reduced by hydrogen peroxide, forming tetraperoxochromate(V): :

Thus, the overall reaction is: :

The compound decomposes spontaneously at higher temperatures but may be stored in sealed containers for extended periods.

References

Sergienko, V. S.. (2007). "Structural chemistry of peroxo compounds of group VI transition metals: I. Peroxo complexes of chromium". Crystallography Reports.
(1975). "Potassium perchromate as a source of singlet oxygen". ACS Publications.
Haxhillazi, Gentiana. (2003-11-04). "Preparation, Structure and Vibrational Spectroscopy of Tetraperoxo Complexes of Cr^V+, V^V+, Nb^V+ and Ta^V+". Universität Siegen.
(1963). "Handbook of Preparative Inorganic Chemistry, 2nd Ed.". Academic Press.

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potassium-compounds chromium–oxygen-compounds oxidizing-agents peroxides chromium(v)-compounds

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