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Trifluoroiodomethane

Iodotrifluoromethane Monoiodotrifluoromethane Trifluoromethyl iodide Perfluoromethyl iodide Freon 13T1 2.3608 g/cm3 at -32.5 °C

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. It would be used as a gaseous fire suppression flooding agent for in-flight aircraft and electronic equipment fires.

Chemistry

It is used in the rhodium-catalyzed α-trifluoromethylation of α,β-unsaturated ketones.

It can be used as a new generation fire extinguishing agent to replace Halon in fire protection systems. The mechanism of extinguishing fires for CF3I is active and primarily based on interruption of the chain reaction in the combustion area of the flame by so-called "negative" catalytic action.{{Cite web|url=https://www.saval.nl/uploads/2017/08/CFI-rim-seal-fire-protection.pdf

In the presence of sunlight or at temperatures above 100 °C it can react with water, forming hazardous by-products such as hydrogen fluoride (HF), hydrogen iodide (HI) and carbonyl fluoride (COF2).

Environmental effects

Trifluoroiodomethane 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. However, the IPCC has calculated the 100-year global warming potential of trifluoroiodomethane to be 0.4 (i.e., 40% of that of CO2).

References

References

  1. Vitali, Juan. "Halon Substitute Protects Aircrews and the Ozone Layer".
  2. "Trifluoroiodomethane 171441".
  3. (August 2022). "Fire extinguishing agents trifluoroiodomethane/CF3I".
  4. (October 2008). "Investigation of the Performance of CF3I Gas as a Possible Substitute for SF6". [[IEEE Transactions on Dielectrics and Electrical Insulation]].
  5. (July 1977). "Tables of molecular vibrational frequencies. Consolidated volume II". Journal of Physical and Chemical Reference Data.
  6. Ramfjord, Birgit. (2012-03-05). "Listing of GWP Values as per Report IPCC WG1 AR4". [[Swedish Defence Materiel Administration]].
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halomethanes fire-suppression-agents fluoroiodoalkanes ozone-depleting-chemical-substances trifluoromethyl-compounds
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