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Carbon trioxide

The Cs, D3h, and C2v isomers of carbon trioxide

IUPAC names

Carbon trioxide
C2v isomer:

  • Dioxiran-3-one

D3h isomer:

  • Carbonate radical
Systematic IUPAC name

C2v isomer:

  • Peroxycarbonic anhydride

D3h isomer:

  • Trioxidocarbon(2•)
Other names

Cs isomer:

  • Oxidooxymethanone
  • Peroxycarbonite radical

CAS Number

  • 12144-05-7

3D model (JSmol)

  • Cs: Interactive image
  • D3h: Interactive image
  • C2v: Interactive image

PubChem CID

  • 19817254



  • Cs: O=[C]O[O]

  • D3h: O=C([O])[O]

  • C2v: O=C1OO1


Chemical formula

Molar mass 60.008 g·mol−1

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Carbon trioxide (CO3) is an unstable oxide of carbon (an oxocarbon). The possible isomers of carbon trioxide include ones with molecular symmetry point groups Cs, D3h, and C2v. The C2v state, consisting of a dioxirane, has been shown lớn be the ground state of the molecule.[1] Carbon trioxide should not be confused with the stable carbonate ion (CO2−

Carbon trioxide can be produced, for example, in the drift zone of a negative corona discharge by reactions between carbon dioxide (CO2) and the atomic oxygen (O) created from molecular oxygen by không tính phí electrons in the plasma.[2] Another reported method is photolysis of ozone O3 dissolved in liquid CO2, or in CO2/SF6 mixtures at −45 °C, irradiated with light of 253.7 nm. The formation of CO3 is inferred but it appears lớn decay spontaneously by the route

2 CO3 → 2 CO2 + O2

with a lifetime much shorter phàn nàn 1 minute.[3] Carbon trioxide can be made by blowing ozone at dry ice (solid CO2), and it has also been detected in reactions between carbon monoxide (CO) and molecular oxygen (O2). Along with the ground state C2v isomer,[4] the first spectroscopic detection of the D3h isomer was in electron-irradiated ices of carbon dioxide.[5]

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Further reading[edit]