Bromodifluoromethane
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| Names | |
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| Preferred IUPAC name
Bromo(difluoro)methane | |
Other names
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.014.681 |
| EC Number |
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| CHBrF2 | |
| Molar mass | 130.92 g/mol |
| Appearance | Gas |
| Density | 1.55 g/cm3 at 16 °C |
| Melting point | −145 °C (−229 °F; 128 K) |
| Boiling point | −14.6 °C (5.7 °F; 258.5 K) |
| Insoluble | |
| Solubility | Alcohol, diethyl ether |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Bromodifluoromethane or Halon 1201 or FC-22B1 is a gaseous trihalomethane or a hydrobromofluorocarbon.
Synthesis
[edit]
It can be prepared through the reaction of hydrogen and dibromodifluoromethane at temperature in range 400–600 °C.[1]
Critical point data: Tc = 138.83 °C (411.98 K); pc = 5.2 MPa (51.32 bar); Vc = 0.275 dm3·mol−1.
Applications
[edit]Bromodifluoromethane was used as a refrigerant and in fire extinguishers. It is a class I ozone depleting substance with ozone depletion potential ODP = 0.74, and a greenhouse gas with global warming potential over 100 years of 398, which is nonetheless much smaller than other fluorinated gases due to its relatively short atmospheric lifetime of 5.2 years.[2] It was banned by the Montreal Protocol in 1996.
References
[edit]- ^ "Method for the production of bromodifluoromethane". Archived from the original on 2007-10-14. Retrieved 2007-05-24.
- ^ Hodnebrog Ø, Aamaas B, Fuglestvedt JS, Marston G, Myhre G, Nielsen CJ, Sandstad M, Shine KP, Wallington TJ (September 2020). "Updated Global Warming Potentials and Radiative Efficiencies of Halocarbons and Other Weak Atmospheric Absorbers". Reviews of Geophysics. 58 (3): e2019RG000691. Bibcode:2020RvGeo..5800691H. doi:10.1029/2019RG000691. PMC 7518032. PMID 33015672.
External links
[edit]- Ogata T, Kuwano S, Oe S (September 1997). "Microwave Spectrum, Nuclear Quadrupole Coupling Constants, and Structure of Bromodifluoromethane". J Mol Spectrosc. 185 (1): 147–52. Bibcode:1997JMoSp.185..147O. doi:10.1006/jmsp.1997.7381. PMID 9344805.
- Cox R.A.; Simmons R.F. (1971). "The kinetics of the gas-phase thermal decomposition of bromodifluoromethane". J. Chem. Soc. B: 1625–31. doi:10.1039/J29710001625.
- Plyler E.K.; Acquista N. (January 1952). "Infrared Absorption Spectra of Five Halomethanes". Journal of Research of the National Bureau of Standards. 48 (1): 92–7. doi:10.6028/jres.048.012. Research Paper 2290.
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