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The Cs, D3h, and C2v isomers of carbon trioxide
|Systematic IUPAC name
3D model (JSmol)
|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).
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. 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. 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. 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, the first spectroscopic detection of the D3h isomer was in electron-irradiated ices of carbon dioxide.
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