Trifluoroiodomethane

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Trifluoroiodomethane
Names
Preferred IUPAC name
Trifluoro(iodo)methane
Other names
Trifluoroiodomethane
Iodotrifluoromethane
Monoiodotrifluoromethane
Trifluoromethyl iodide
Perfluoromethyl iodide
Freon 13T1
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.017.286 Edit this at Wikidata
EC Number
  • 219-014-5
RTECS number
  • PB6975000
UNII
  • InChI=1S/CF3I/c2-1(3,4)5 checkY
    Key: VPAYJEUHKVESSD-UHFFFAOYSA-N checkY
  • InChI=1/CF3I/c2-1(3,4)5
  • FC(F)(F)I
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 −110 °C (−166 °F; 163 K)
Boiling point −22.5 °C (−8.5 °F; 250.7 K)
Slightly
Vapor pressure 541 kPa
Hazards
GHS labelling:
GHS08: Health hazard
Warning
H341
P201, P202, P281, P308+P313, P405, P501
Supplementary data page
Trifluoroiodomethane (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Trifluoroiodomethane, also referred to as trifluoromethyl iodide is a

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.

Chemistry

It is used in the

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).[citation needed]

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.[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]

References

  1. ^ Vitali, Juan. "Halon Substitute Protects Aircrews and the Ozone Layer". www.afrlhorizons.com. 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.[unreliable source?]
  4. ^ "CFI rim seal fire protection for floating roof tanks" (PDF). 2018-09-20.
  5. S2CID 21905295
    .
  6. doi:10.1063/1.555560
    .
  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.

Further reading

External links
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