Trifluoromethylsulfur pentafluoride

Trifluoromethylsulfur pentafluoride, CF₃SF₅, is a rarely used industrial greenhouse gas.^[1] It was first identified in the atmosphere in 2000.^[2] Trifluoromethylsulfur pentafluoride is considered to be one of the several "super-greenhouse gases".

Trifluoromethylsulfur pentafluoride

Names
Preferred IUPAC name Pentafluoro(trifluoromethyl)-λ6-sulfane
Identifiers
CAS Number	373-80-8 Y
3D model (JSmol)	Interactive image
ChemSpider	119988
ECHA InfoCard	100.196.530
EC Number	670-841-1
PubChem CID	136213
CompTox Dashboard (EPA)	DTXSID60190759
InChI InChI=1S/CF8S/c2-1(3,4)10(5,6,7,8)9 Key: QIYZKVMAFMDRTP-UHFFFAOYSA-N
SMILES FC(F)(F)S(F)(F)(F)(F)F
Properties
Chemical formula	CF8S
Molar mass	196.06 g·mol−1
Melting point	−87 °C (−125 °F; 186 K)
Boiling point	−20.4 °C (−4.7 °F; 252.8 K)
Hazards
GHS labelling:
Pictograms
Hazard statements	H315, H319, H335, H336
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362+P364, P403+P233, P405, P410+P403, P501
NFPA 704 (fire diamond)	3 0 0 SA
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Properties

The chemistry of this compound is similar to that of sulfur hexafluoride (SF₆).^[3]

As a greenhouse gas

On a per molecule basis, it is considered to be the most potent greenhouse gas present in Earth's atmosphere, having a global warming potential of about 18,000 times that of carbon dioxide.^[4] The chemical is predicted to have a lifetime of 800 years in the atmosphere.^[5] However, the current concentration of trifluoromethylsulfur pentafluoride remains at a level that is unlikely to measurably contribute to global warming.^[4] The presence of the gas in the atmosphere is attributed to anthropogenic sources, possibly a by-product of the manufacture of fluorochemicals, originating from reactions of SF₆ with fluoropolymers used in electronic devices and in microchips, or the formation can be associated with high voltage equipment created from SF₆ (a breakdown product of high voltage equipment) reacting with CF₃ to form the CF₃SF₅ molecule.^[4]

References

1. Tuckett, Richard P. (2006). "Chapter 3: Trifluoromethyl Sulphur Pentafluoride, SF₅CF₃: Atmospheric Chemistry and Its Environmental Importance via the Greenhouse Effect". In Tressaud, Alain (ed.). Fluorine and the Environment Chemistry, Emissions, & Lithosphere (Advances in Fluorine Science series) (PDF). Vol. 1. Elsevier. pp. 89–129. doi:10.1016/S1872-0358(06)01003-7. ISBN 0-444-52811-3.
2. Sturges, W.T.; T. J. Wallington; M. D. Hurley; K. P. Shine; K. Sihra; A. Engel; D. E. Oram; S. A. Penkett; R. Mulvaney; C.A.M. Brenninkmeijer (28 July 2000). "A Potent Greenhouse Gas Identified in the Atmosphere: SF₅CF₃". Science. 289 (5479): 611–613. Bibcode:2000Sci...289..611S. doi:10.1126/science.289.5479.611. PMID 10915622.
3. Silvey, Gene A.; Cady, George H. (1950). "Trifluoromethylsulfur Pentafluoride". J. Am. Chem. Soc. 72 (8): 3624–3626. doi:10.1021/ja01164a084.
4. Suen, Martin (2008). "Trifluoromethyl Sulfur Pentafluoride (CF₃SF₅): A Review of the Recently Discovered Super-Greenhouse Gas in the Atmosphere". The Open Atmospheric Science Journal. 2 (1): 56–60. Bibcode:2008OASJ....2...56S. doi:10.2174/1874282300802010056.
5. Tsai, Wen-Tien (2007). "The prediction of environmental fate for trifluoromethyl sulfur pentafluoride (CF₃SF₅), a potent greenhouse gas". Journal of Hazardous Materials. 149 (3): 747–751. doi:10.1016/j.jhazmat.2007.08.035. PMID 17884286.