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In chemistry, peroxycarbonate (sometimes peroxocarbonate) is a divalent anion with formula CO2−
. It is an oxocarbon anion that consists solely of carbon and oxygen. It would be the anion of a hypothetical peroxocarbonic acid HO–CO–O–OH[1][2] or the real hydroperoxyformic acid, HO-O-CO-OH (a.k.a. percarbonic acid, carbonoperoxoic acid).

The peroxycarbonate anion is formed, together with peroxydicarbonate C
, at the negative electrode during electrolysis of molten lithium carbonate.[3] Lithium peroxycarbonate can be produced also by combining carbon dioxide CO2 with lithium hydroxide in concentrated hydrogen peroxide H2O2 at −10 °C.[4]

The peroxycarbonate anion has been proposed as an intermediate to explain the catalytic effect of CO2 on the oxidation of organic compounds by O2.[5]

The potassium and rubidium salts of the monovalent hydrogenperoxocarbonate anion H–O–O–CO
have also been obtained.[6][7][8][9]

See also[edit]


  1. ^ E. H. Riesenfeld, B. Reinhold (1909), "Die Existenz echter Percarbonate und ihre Unterscheidung von Carbonaten mit Krystall-Wasserstoffsuperoxyd". Berichte der deutschen chemischen Gesellschaft, 42(4), 4377–4383, doi:10.1002/cber.19090420428.
  2. ^ E. H. Riesenfeld, W. Mau (1911): "Isomere Percarbonate". Berichte der deutschen chemischen Gesellschaft, 44(3), 3595–3605, doi:10.1002/cber.191104403244
  3. ^ Li-Jiang Chen, Chang-Jian Lin, Juan Zuo, Ling-Chun Song, and Chao-Ming Huang (2004), "First Spectroscopic Observation of Peroxocarbonate / Peroxodicarbonate in Molten Carbonate". J. Physical Chemistry B, volume 108, 7553–7556
  4. ^ T. P. Firsova, V. I. Kvlividze, A. N. Molodkina and T. G. Morozova (1975), "Synthesis and some properties of lithium peroxocarbonate". Russian Chemical Bulletin, Volume 24, Number 6, pp. 1318–1319; doi:10.1007/BF00922073
  5. ^ Sang-Eon Park, Jin S. Yoo (2004), "New CO2 chemistry: Recent advances in utilizing CO2 as an oxidant and current understanding on its role." Studies in Surface Science and Catalysis, volume 153, pp. 303–314.
  6. ^ Mimoza Gjikaj (2001), "Darstellung und strukturelle Charakterisierung neuer Alkali- bzw. Erdalkalimetallperoxide, -hydrogenperoxide, -peroxocarbonate und -peroxohydrate". Doctoral Thesis, University of Köln. 115 pages.
  7. ^ Arnold Adam and Mathias Mehta (1998), "KH(O2)CO2·H2O2: Ein sauerstoffreiches Salz der Monoperoxokohlensaure". Angew. Chem. volume 110 p. 1457. Cited by Gjikaj.
  8. ^ M. Mehta and A. Adam (1998), Z. Kristallogr., Suppl. Issue 15 p. 53. Cited by Gjikaj.
  9. ^ M. Mehta and A. Adam (1998), Z. Kristallogr., Suppl. Issue 15 p. 46. Cited by Gjikaj.