Criegee biradical

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Criegee intermediate (shown as zwitterion)

A criegee biradical (also called a criegee intermediate[1]) is a carbonyl oxide with two free radical centres which act independently of each other. These molecules help to break down sulfur dioxide and nitrogen dioxide in the atmosphere, and may help offset global warming.[2]

The formation of Criegee biradicals was first postulated in the 1950s by Rudolf Criegee.[3]

The infrared absorption spectrum of the simplest Criegee intermediate (CH2OO) has recently been published by the team of Lee and Witek.[4]

See also[edit]


  1. ^ Castro, Joseph. "How mysterious molecules may help cool Earth". MSNBC. Retrieved 2012-01-12. 
  2. ^ Oliver Welz, John D. Savee, David L. Osborn, Subith S. Vasu, Carl J. Percival, Dudley E. Shallcross, Craig A. Taatjes. Direct Kinetic Measurements of Criegee Intermediate (CH2OO) Formed by Reaction of CH2I with O2. Science, 2012; 335 (6065): 204-207 doi:10.1126/science.1213229
  3. ^ "Offsetting Global Warming: Molecule in Earth's Atmosphere Could 'Cool the Planet'". Science Daily. January 12, 2012. Retrieved 2012-01-14. 
  4. ^ "Infrared Absorption Spectrum of the Simplest Criegee Intermediate CH2OO". Retrieved 28 November 2013.