Peroxycarbonate

In chemistry, peroxycarbonate (sometimes peroxocarbonate, IUPAC name: oxocarbonate or oxidocarbonate) or percarbonate is a divalent anion with formula CO²⁻
₄. It is an oxocarbon anion that consists solely of carbon and oxygen. It is the anion of peroxycarbonic acid^[1][2] also called hydroperoxyformic acid,^[3] HO−O−CO−OH.

α-Peroxycarbonate

Names
Preferred IUPAC name Oxidocarbonate
Systematic IUPAC name Oxocarbonate
Other names Peroxycarbonate (Peroxocarbonate) Percarbonate Peroxidocarboxylate Peroxidoformate Dioxidan-2-idecarboxylate
Identifiers
CAS Number	34099-49-5 N[EPA]
3D model (JSmol)	Interactive image
ChemSpider	23255841
PubChem CID	15793132
CompTox Dashboard (EPA)	DTXSID00578375
InChI InChI=1S/CH2O4/c2-1(3)5-4/h4H,(H,2,3)/p-2 Key: MMCOUVMKNAHQOY-UHFFFAOYSA-L
SMILES C(=O)([O-])O[O-]
Properties
Chemical formula	CO42−
Molar mass	76.01 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

The peroxycarbonate anion is formed, together with peroxydicarbonate C₂O2−6, at the negative electrode during electrolysis of molten lithium carbonate.^[4] Lithium peroxycarbonate can be produced also by combining carbon dioxide CO₂ with lithium hydroxide in concentrated hydrogen peroxide H₂O₂ at −10 °C.^[5]

Electrolysis of a solution of lithium carbonate at -30° to -40 °C yields a solution of the Lithium percarbonate, which can liberate iodine from potassium iodide instantaneously. The crystalline salt has not been isolated.

The peroxycarbonate anion has been proposed as an intermediate to explain the catalytic effect of CO₂ on the oxidation of organic compounds by O₂.^[6]

The potassium and rubidium salts of the monovalent hydrogenperoxycarbonate anion (aka. hydroxycarbonate, biperoxycarbonate) H−O−O−CO−2 have also been obtained.^{[7][8][9][10]}

See also

• Sodium percarbonate, actually a perhydrate of sodium carbonate.
• Sodium peroxycarbonate
• Orthocarbonate anion CO⁴⁻
  ₄
• Dipropyl peroxydicarbonate