Trifluoroiodomethane

Trifluoroiodomethane
IUPAC name Trifluoroiodomethane
Other names Iodotrifluoromethane, Monoiodotrifluoromethane, Trifluoromethyl iodide, Perfluoromethyl iodide, Freon 13T1
Identifiers
CAS number	2314-97-8 Y
PubChem	16843
ChemSpider	15962 Y
UNII	42A379KB0U Y
EC number	219-014-5
RTECS number	PB6975000
Jmol-3D images	Image 1
SMILES FC(F)(F)I
InChI InChI=1S/CF3I/c2-1(3,4)5 Y Key: VPAYJEUHKVESSD-UHFFFAOYSA-N Y InChI=1/CF3I/c2-1(3,4)5
Properties
Molecular formula	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
Boiling point	-22.5 °C
Solubility in water	Slightly
Vapor pressure	541 kPa
Hazards
MSDS	External MSDS
EU Index	602-086-00-0
EU classification	Muta. Cat. 3
R-phrases	R68
S-phrases	(S2), S36/37
Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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.

Chemistry

It is used in the rhodium-catalyzed α-trifluoromethylation of α,β-unsaturated ketones.^[1]

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^[2]. Thus, even after decomposition, trifluoroiodomethane is likely to be a very effective greenhouse gas.^[2]

Further reading

• Iodotrifluoromethane: Toxicity Review (2004)

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). doi:10.1023/A:1006683529436. http://www.ingentaconnect.com/content/klu/ijot/2000/00000021/00000002/00224129. 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. http://www.ingentaconnect.com/content/els/03783812/1999/00000154/00000001/art00439;jsessionid=1f3be6692x7fr.alice. 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. http://pubs.acs.org/cgi-bin/abstract.cgi/jceaax/1997/42/i05/abs/je9700378.html. 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. http://pubs.acs.org/cgi-bin/abstract.cgi/jceaax/1999/44/i03/abs/je980251b.html. Retrieved 2007-06-02. 
• Chamber Studies of Photolysis and Hydroxyl Radical Reactions of Trifluoroiodomethane

1. ^ 171441 Trifluoroiodomethane 99%
2. ^ ^{a b} http://webbook.nist.gov/cgi/cbook.cgi?ID=C2314978&Units=SI&Mask=800#Electronic-Spec

External links

• MSDS at Oxford University
• Physical properties
• Data sheet (in Japanese)