Carbon trioxide

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Possible structures of CO 3 according to their geometry:
C s , D 3h and C 2v

Carbon trioxide (CO 3 ) is an unstable reaction product of carbon dioxide , CO 2 , and atomic oxygen , O. It differs from the carbonate anion CO 3 2− . It has also been detected in reactions between carbon monoxide , CO, and molecular oxygen O 2 and in the drift zone of negative corona discharges . Here, carbon dioxide and atomic oxygen ions, which are created by free electrons in the plasma from O 2 , react .

There are three possible structures for CO 3 , which are named C s , D 3h and C 2v according to their geometry . The cyclic, non-radical C 2v form has been shown in most studies to be the ground state of the molecule, whereas the two unstable forms are biradicals . The C s and the C 2v forms also belong to the peroxides .

Theoretically conceivable forms are also dimers (C 2 O 6 ) with six-ring structures, which then also belong to the peroxides. It is also possible to formulate a non-radical, open-chain form with formal charges (O = C = OO) and mesomeric boundary structures similar to ozone . In practice, however, their existence has not yet been proven.

Individual evidence

  1. ^ Sabin JR, Kim H .: A theoretical study of the structure and properties of carbon trioxide . In: Chemical Physics Letters . 11, No. 5, 1971, pp. 593-597. bibcode : 1971CPL .... 11..593S . doi : 10.1016 / 0009-2614 (71) 87010-0 .
  2. ↑ V. Sobek, JD Skalný: A simple model of processes in the drift region of negative corona discharge in a mixture of air with halogenated carbons. In: Czechoslovak Journal of Physics. 43, 1993, p. 807, doi : 10.1007 / BF01589802 .
  3. ↑ Electronic structure and spectroscopy of carbon trioxide

Other sources

  • Pople JA, Seeger U., Seeger R., Schleyer P. v. R. The structure of carbon trioxide . In: Journal of Computational Chemistry . 1, No. 2, 2004, pp. 199-203. doi : 10.1002 / jcc.540010215 .
  • Moll NG, Clutter DR, Thompson WE: Carbon Trioxide: Its Production, Infrared Spectrum, and Structure Studied in a Matrix of Solid CO 2 . In: The Journal of Chemical Physics . 45, No. 12, 1966, pp. 4469-4481. doi : 10.1063 / 1.1727526 .
  • Gimarc BM, Chou TS: Geometry and Electronic Structure of Carbon Trioxide . In: The Journal of Chemical Physics . 49, No. 9, 1968, pp. 4043-4047. doi : 10.1063 / 1.1670715 .
  • DeMore WB, Jacobsen CW: Formation of carbon trioxide in the photolysis of ozone in liquid carbon dioxide . In: Journal of Physical Chemistry . 73, No. 9, 1969, pp. 2935-2938. doi : 10.1021 / j100843a026 .
  • DeMore WB, Dede C .: Pressure dependence of carbon trioxide formation in the gas-phase reaction of O (1D) with carbon dioxide . In: Journal of Physical Chemistry . 74, No. 13, 1970, pp. 2621-2625. doi : 10.1021 / j100707a006 .
  • Francisco JS, Williams IH: A theoretical study of the force field for carbon trioxide . In: Chemical Physics . 95, No. 3, 1985, pp. 373-383. doi : 10.1016 / 0301-0104 (85) 80160-9 .