Peroxycarbonate

In chemistry, peroxycarbonate (sometimes peroxocarbonate) is a divalent anion with formula CO2−
4
. 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
2
O2−
6
, 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
2
have also been obtained.[6][7][8][9]

See also

References

  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.
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