Trifluoroiodomethane

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Template:Chembox ECNumberTemplate:Chembox E numberTemplate:Chembox SolubilityInWater
Trifluoroiodomethane
IUPAC name Trifluoroiodomethane
Other names Iodotrifluoromethane, Monoiodotrifluoromethane, Trifluoromethyl iodide, Perfluoromethyl iodide, Freon 13T1
Identifiers
3D model (JSmol)
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RTECS number PB6975000
Properties
CF3I
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
Boiling point
Vapor pressure 541 kPa
Hazards
Main hazards Harmful (Xn)
R-phrases R36/37/38, R44, R68
S-phrases S7, S26, S36/37/39, S38
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and 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 [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]

Chemistry

It is used in the rhodium-catalyzed α-trifluoromethylation of α,ß-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 effects

It 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 reading

For 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

  • 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). Retrieved 2007-06-02.
  • 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. 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). 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. Retrieved 2007-06-02.
  • Chamber Studies of Photolysis and Hydroxyl Radical Reactions of Trifluoroiodomethane

See also

External links


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