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Cyclic ozone is a theoretically predicted form of ozone. Like ordinary ozone (O3), it would have three oxygen atoms. It would differ from ordinary ozone in how those three oxygen atoms are arranged. In ordinary ozone, the atoms are arranged in a bent line; in cyclic ozone, they would form an equilateral triangle.

Cyclic ozone
Ball and stick model of cyclic ozone
Systematic IUPAC name
3D model (JSmol)
Molar mass 47.997 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Some of properties of cyclic ozone have been predicted theoretically. It should have more energy than ordinary ozone.[2]

There is evidence that tiny quantities of cyclic ozone exist at the surface of magnesium oxide crystals in air.[3] Cyclic ozone has not been made in bulk, although at least one researcher has attempted to do so using lasers.[4] Another possibility to stabilize this form of oxygen is to produce it inside confined spaces, e.g., fullerene.[5]

It has been speculated that, if cyclic ozone could be made in bulk, and if it proved to have good stability properties, it could be added to liquid oxygen to improve the specific impulse of rocket fuel.[4]

Currently, the possibility of cyclic ozone is confirmed within diverse theoretical approaches.[6][5][7]


  1. ^ "CID 16206854 - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 11 July 2007. Identification and Related Records. Retrieved 21 October 2011.
  2. ^ Hoffmann, Roald (January–February 2004). "The story of O. The Ring". American Scientist. 92 (1): 23–24. doi:10.1511/2004.1.23.
  3. ^ Plass, Richard; Kenneth Egan; Chris Collazo-Davila; Daniel Grozea; Eric Landree; Laurence D. Marks; Marija Gajdardziska-Josifovska (November 30, 1998). "Cyclic Ozone Identified in Magnesium Oxide (111) Surface Reconstructions" (PDF). Physical Review Letters. 81 (22): 4891–4894. Bibcode:1998PhRvL..81.4891P. doi:10.1103/PhysRevLett.81.4891. Retrieved 2010-06-05.
  4. ^ a b "Temple Researcher Attempting To Create Cyclic Ozone". Science Daily. February 8, 2005. Retrieved 2010-06-05.
  5. ^ a b Sabirov, Denis; Igor, Shepelevich (2015). "Information entropy of oxygen allotropes. A still open discussion about the closed form of ozone". Computational and Theoretical Chemistry. 1073 (1): 61–66. doi:10.1016/j.comptc.2015.09.016.
  6. ^ Xantheas, Sotiris; Atchity, Gregory; Elbert, Stephen; Ruedenberg, Klaus (1991). "Potential energy surfaces of ozone. I". J. Chem. Phys. 94 (12): 8054. Bibcode:1991JChPh..94.8054X. doi:10.1063/1.460140.
  7. ^ Lee, Timothy (1990). "On the energy separation between the open and cyclic forms of ozone". Chemical Physics Letters. 169 (6): 529–533. Bibcode:1990CPL...169..529L. doi:10.1016/0009-2614(90)85642-P.