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Preferred IUPAC name
Other names
Trifluoromethyl iodide
Perfluoromethyl iodide
Freon 13T1
3D model (JSmol)
ECHA InfoCard 100.017.286
EC Number 219-014-5
RTECS number PB6975000
Molar mass 195.91 g/mol
Appearance Colorless odorless gas
Density 2.5485 g/cm3 at -78.5 °C
2.3608 g/cm3 at -32.5 °C
Melting point −110 °C (−166 °F; 163 K)
Boiling point −22.5 °C (−8.5 °F; 250.7 K)
Vapor pressure 541 kPa
Safety data sheet See: data page
Muta. Cat. 3
R-phrases (outdated) R68
S-phrases (outdated) (S2), S36/37
Supplementary data page
Refractive index (n),
Dielectric constantr), etc.
Phase behaviour
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☑Y verify (what is ☑Y☒N ?)
Infobox references

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


It is used in the rhodium-catalyzed α-trifluoromethylation of α,β-unsaturated ketones.[2]

It can be used as a new generation fire extinguishing agent to replace Halon in fire protection systems.[3] 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.[4] It is also used as an eco-friendly insulation gas to replace SF6 in electrical power industry.[5]

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[edit]

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.[6] However, the IPCC has calculated the 100-year global warming potential of trifluoroiodomethane to be 0.4 (i.e., 40% of that of CO2).[7]

Further reading[edit]


  • Duan Y. Y., Shi L., Sun L. Q., Zhu M. S., Han L. Z. (March 2000). "Thermodynamic Properties of Trifluoroiodomethane (CF3I)". International Journal of Thermophysics. 21 (2): 393–404(12). doi:10.1023/A:1006683529436. Retrieved 2007-06-02. (dead link 1 April 2019)
  • Duan Y. Y., Shi L., Zhu M. S., Han L. Z. (January 1999). "Surface tension of trifluoroiodomethane (CF3I)". Fluid Phase Equilibria. 154 (1): 71–77(7). doi:10.1016/S0378-3812(98)00439-7. Archived from the original on 2007-10-01. Retrieved 2007-06-02.
  • Duan Y. Y., Shi L., Sun L. Q., Zhu M. S., Han L. Z. (1997). "Thermal Conductivity of Gaseous Trifluoroiodomethane (CF3I)". J. Chem. Eng. Data. 42 (5): 890–893 (4). doi:10.1021/je9700378. Retrieved 2007-06-02.
  • Duan Y. Y., Shi L., Zhu M. S., Han L. Z. (1999). "Critical Parameters and Saturated Density of Trifluoroiodomethane (CF3I)". J. Chem. Eng. Data. 44 (3): 501–504. doi:10.1021/je980251b. Retrieved 2007-06-02.
  • Chamber Studies of Photolysis and Hydroxyl Radical Reactions of Trifluoroiodomethane
  1. ^ Vitali, Juan. "Halon Substitute Protects Aircrews and the Ozone Layer". Archived from the original on 11 July 2007. Retrieved 2017-09-06.
  2. ^ "Trifluoroiodomethane 171441". Sigma-Aldrich. Retrieved 2017-09-06.
  3. ^ "Fire extinguishing agents trifluoroiodomethane/CF3I". beijingyuji. Retrieved 2018-09-20.
  4. ^ "CFI rim seal fire protection for floating roof tanks" (PDF). 2018-09-20.
  5. ^ "Investigation of the Performance of CF3I Gas as a Possible Substitute for SF6". Retrieved 2018-09-20.
  6. ^ Shimanouchi, T. (1972). "Methane, trifluoroiodo-". 6 (3): 993–1102. Retrieved 2017-09-06.
  7. ^ Ramfjord, Birgit (2012-03-05). "Listing of GWP Values as per Report IPCC WG1 AR4" (PDF). Swedish Defence Materiel Administration. Archived from the original (PDF) on 13 March 2016. Retrieved 7 September 2017.

External links[edit]