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Trifluoroiodomethane
Trifluoroiodomethane, also referred to as trifluoromethyl iodide is a halomethane with the formula CF3I. It is an experimental alternative to Halon 1301 (CBrF3) in unoccupied areas [2]. It would be used as a gaseous fire suppression flooding agent for in-flight aircraft and electronic equipment fires. It has been reviewed as environment-safe and non-toxic.[1][2] Additional recommended knowledge
ChemistryIt is used in the rhodium-catalyzed α-trifluoromethylation of α,β-unsaturated ketones.[3] In the presence of sunlight or at temperatures above 100°C it undergoes decomposition with hazardous by-products as hydrogen fluoride (HF), hydrogen iodide (HI) and carbonyl fluoride (COF2). Environmental effectsIt contains carbon, fluorine, and iodine atoms. Although iodine is several hundred times more efficient at destroying stratospheric ozone than chlorine, experiments have shown that because the weak C-I bond breaks easily under the influence of water (owing to the electron-attracting fluorine atoms), trifluoroiodomethane has an ozone depleting potential less than one-thousandth that of Halon 1301 (0.008-0.01). Its atmospheric lifetime, at less than 1 month, is less than 1 percent that of Halon 1301, and less even than hydrogen chloride formed from volcanoes. There is, however, still the problem of the C-F bonds absorbing in the atmospheric window. Thus, even after decomposition, trifluoroiodomethane is likely to be a very effective greenhouse gas. Further readingFor further information, a report from the Board on Environmental Studies and Toxicology of the National Academy of Sciences entitled Iodotrifluoromethane: Toxicity Review (2004) is available for free online reading and research in several formats. References
See also
Categories: Organohalides | Halomethanes |
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Trifluoroiodomethane". A list of authors is available in Wikipedia. |