Potassium tetraperoxochromate(V)
Chemical compound From Wikipedia, the free encyclopedia
Potassium peroxochromate, potassium tetraperoxochromate(V), or simply potassium perchromate, is an inorganic compound having the chemical formula K3[Cr(O2)4]. 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.[2] This compound is used as a source of singlet oxygen.[1]
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Names | |
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IUPAC name
Potassium tetraperoxochromate(V) | |
Other names
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Identifiers | |
3D model (JSmol) |
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ChemSpider | |
PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
K3[Cr(O2)4] | |
Molar mass | 297.286 g/mol |
Appearance | black |
Melting point | 70 °C (158 °F; 343 K)[1] (decomposes) |
Poorly soluble (0 °C) Reacts (45 °C)[1] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
Potassium peroxochromate is prepared by treating potassium chromate with hydrogen peroxide at 0 °C:
- 2 CrO2−4 + 8 H2O2 → 2 [Cr(O2)4]2− + 8 H2O
The intermediate tetraperoxochromate(VI) is reduced by hydrogen peroxide, forming tetraperoxochromate(V):[3][4]
- 2 [Cr(O2)4]2− + 2 OH− + H2O2 → 2 [Cr(O2)4]3− + 2 H2O + O2
Thus, the overall reaction is:
- 2 CrO2−4 + 9 H2O2 + 2 OH− → 2 [Cr(O2)4]3− + 10 H2O + O2
The compound decomposes spontaneously at higher temperatures.
References
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