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词条 Trifluoroiodomethane
释义

  1. Chemistry

  2. Environmental effects

  3. Further reading

  4. References

  5. External links

{{chembox
| Watchedfields = changed
| verifiedrevid = 470614463
| ImageFileL1 = Trifluoroiodomethane.png
| ImageFileR1 = Trifluoroiodomethane-3D-vdW.png
| PIN = Trifluoro(iodo)methane
| OtherNames = Trifluoroiodomethane
Iodotrifluoromethane
Monoiodotrifluoromethane
Trifluoromethyl iodide
Perfluoromethyl iodide
Freon 13T1
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 15962
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/CF3I/c2-1(3,4)5
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = VPAYJEUHKVESSD-UHFFFAOYSA-N
| CASNo = 2314-97-8
| CASNo_Ref = {{cascite|correct|CAS}}
| EINECS = 219-014-5
| PubChem = 16843
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 42A379KB0U
| SMILES = FC(F)(F)I
| InChI = 1/CF3I/c2-1(3,4)5
| RTECS = PB6975000
|Section2={{Chembox Properties
| Formula = CF3I
| MolarMass = 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
| MeltingPtC = -110
| BoilingPtC = -22.5
| Solubility = Slightly
| VaporPressure = 541 kPa
|Section3={{Chembox Hazards
| EUClass = Muta. Cat. 3
| RPhrases = {{R68}}
| SPhrases = {{S2}}, {{S36/37}}
| FlashPt =
}}

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.[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

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

  • Iodotrifluoromethane: Toxicity Review (2004)

References

  • {{cite journal |date=March 2000 | title = Thermodynamic Properties of Trifluoroiodomethane (CF3I) | journal = International Journal of Thermophysics | volume = 21 | issue = 2 | pages = 393–404(12) | url = http://www.ingentaconnect.com/content/klu/ijot/2000/00000021/00000002/00224129 | accessdate = 2007-06-02 | doi = 10.1023/A:1006683529436 | author1 = Duan Y. Y. | author2 = Shi L. | author3 = Sun L. Q. | author4 = Zhu M. S. | author5 = Han L. Z. |name-list-format=vanc}} (dead link 1 April 2019)
  • {{cite journal | date = January 1999 | title = Surface tension of trifluoroiodomethane (CF3I) | journal = Fluid Phase Equilibria | volume = 154 | issue = 1 | pages = 71–77(7) | doi = 10.1016/S0378-3812(98)00439-7 | url = http://www.ingentaconnect.com/content/els/03783812/1999/00000154/00000001/art00439;jsessionid=1f3be6692x7fr.alice | accessdate = 2007-06-02 | author1 = Duan Y. Y. | author2 = Shi L. | author3 = Zhu M. S. | author4 = Han L. Z. | name-list-format = vanc | deadurl = yes | archiveurl = https://web.archive.org/web/20071001192050/http://www.ingentaconnect.com/content/els/03783812/1999/00000154/00000001/art00439;jsessionid=1f3be6692x7fr.alice | archivedate = 2007-10-01 | df = }}
  • {{cite journal | year = 1997 | title = Thermal Conductivity of Gaseous Trifluoroiodomethane (CF3I) | journal = J. Chem. Eng. Data | volume = 42 | issue = 5 | pages = 890–893 (4) | url = http://pubs.acs.org/cgi-bin/abstract.cgi/jceaax/1997/42/i05/abs/je9700378.html | accessdate = 2007-06-02 | doi = 10.1021/je9700378 | author1 = Duan Y. Y. | author2 = Shi L. | author3 = Sun L. Q. | author4 = Zhu M. S. | author5 = Han L. Z. |name-list-format=vanc}}
  • {{cite journal | year = 1999 | title = Critical Parameters and Saturated Density of Trifluoroiodomethane (CF3I) | journal = J. Chem. Eng. Data | volume = 44 | issue = 3 | pages = 501–504 | url = http://pubs.acs.org/cgi-bin/abstract.cgi/jceaax/1999/44/i03/abs/je980251b.html | accessdate = 2007-06-02 | doi = 10.1021/je980251b | author1 = Duan Y. Y. | author2 = Shi L. | author3 = Zhu M. S. | author4 = Han L. Z. |name-list-format=vanc}}
  • [https://web.archive.org/web/20070930195359/http://stinet.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA318474 Chamber Studies of Photolysis and Hydroxyl Radical Reactions of Trifluoroiodomethane]
1. ^{{Cite web|url=http://www.afrlhorizons.com/Briefs/0012/ML0008.html|title=Halon Substitute Protects Aircrews and the Ozone Layer|last=Vitali|first=Juan|date=|website=www.afrlhorizons.com|language=en-US|archive-url=https://web.archive.org/web/20070711055402/http://www.afrlhorizons.com/Briefs/0012/ML0008.html|archive-date=11 July 2007|dead-url=yes|access-date=2017-09-06|df=}}
2. ^{{Cite web|url=http://www.sigmaaldrich.com/catalog/product/aldrich/171441|title=Trifluoroiodomethane 171441|website=Sigma-Aldrich|access-date=2017-09-06}}
3. ^{{Cite web|url=http://www.beijingyuji.com/english/product/fluorine/Fire-Extinguishing-Agents/|title=Fire extinguishing agents trifluoroiodomethane/CF3I|website=beijingyuji|access-date=2018-09-20}}
4. ^{{Cite web|url=https://www.saval.nl/uploads/2017/08/CFI-rim-seal-fire-protection.pdf|title=CFI rim seal fire protection for floating roof tanks|date=2018-09-20}}
5. ^{{Cite web|url=https://www.researchgate.net/publication/224342332|title=Investigation of the Performance of CF3I Gas as a Possible Substitute for SF6 |website=researchgate.net|access-date=2018-09-20}}
6. ^{{Cite journal|url=http://webbook.nist.gov/cgi/cbook.cgi?ID=C2314978&Units=SI&Mask=800#Electronic-Spec|title=Methane, trifluoroiodo-|volume=6|issue=3|pages=993–1102|website=webbook.nist.gov|language=en|access-date=2017-09-06|year=1972|last1=Shimanouchi|first1=T.}}
7. ^{{Cite web|url=http://www.fmv.se/Global/Dokument/Engelska%20webben/Our%20activities/Enviromental%20work/Environmental%20criteria%20documents/121023/12FMV1533%202%201%20GWP%20eng.pdf|title=Listing of GWP Values as per Report IPCC WG1 AR4|last=Ramfjord|first=Birgit|date=2012-03-05|website=|publisher=Swedish Defence Materiel Administration|archive-url=https://web.archive.org/web/20160313122319/http://www.fmv.se/Global/Dokument/Engelska%20webben/Our%20activities/Enviromental%20work/Environmental%20criteria%20documents/121023/12FMV1533%202%201%20GWP%20eng.pdf|archive-date=13 March 2016|dead-url=|access-date=7 September 2017}}

External links

  • Physical properties
  • [https://web.archive.org/web/20070930073723/http://www.f-techinc.co.jp/media/FJJ.pdf Data sheet (in Japanese)]
  • Material Safety Data Sheet CF3I (in English)
  • CF3I can be used as fire extinguishing agent
{{Halomethanes}}{{fluorine compounds}}

4 : Halomethanes|Fire suppression agents|Trifluoromethyl compounds|Organoiodides
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