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| Names | |
|---|---|
| Preferred IUPAC name Dibromo(difluoro)methane | |
| Other names
Dibromodifluoromethane Difluorodibromomethane Carbon dibromide difluoride Carbon bromide fluoride Halon 1202 Fluorocarbon 12-B2 FC 12-B2 R 12B2 UN 1941 Freon 12B2 | |
| Identifiers | |
| CAS Number | |
| 3D model (JSmol) | |
| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.000.805 
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| EC Number |
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| PubChem CID | |
| RTECS number |
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| UNII | |
| UN number | 1941 |
| CompTox Dashboard (EPA) | |
InChI
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SMILES
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| Properties | |
| Chemical formula | CBr2F2 |
| Molar mass | 209.82 g/mol |
| Appearance | Colourless gas/liquid |
| Density |
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| Melting point | −101.1 °C (−150.0 °F; 172.1 K) |
| Boiling point | 22.8 °C (73.0 °F; 295.9 K) |
| Solubility in water | insoluble |
| log P | 1.99 |
| Vapor pressure | 83 kPa at 20 °C |
| Hazards | |
| GHS labelling: | |
| Pictograms | 
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| Signal word | Warning |
| Hazard statements | H420 |
| Precautionary statements | P502 |
| NFPA 704 (fire diamond) |
 |
| Flash point | Non-flammable |
| NIOSH (US health exposure limits): | |
| PEL (Permissible) | TWA 100 ppm (860 mg/m) |
| REL (Recommended) | TWA 100 ppm (860 mg/m) |
| IDLH (Immediate danger) | 2000 ppm |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).
 Y verify (what is ?)
Infobox references
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Dibromodifluoromethane is a mixed halomethane. It is a colorless non-flammable liquid. Along with Halons 1211, 2402, and 1301, it is one of the most effective fire extinguishers, however, it is also very toxic. It is a class I ozone depleting substance (ODS).
Synthesis
Dibromodifluoromethane can be obtained by vapor phase bromination of difluoromethane.
It is also formed during the fluorination of carbon tetrabromide.
Table of physical properties
| Property | Value |
|---|---|
| Density, ρ, at 15 °C (liquid) | 2.3063 g/cm |
| Critical temperature, Tc | 198.3 °C, 471.3 K |
| Critical pressure, pc | 4.13 MPa, 40.8 bar |
| Refractive index, n at 20 °C, D | 1.398 |
| Dipole moment | 0.7 D |
| Ozone depletion potential, ODP | 0.4, CCl3F is 1 |
| Global warming potential, GWP | 231, CO2 is 1 |
References
- ^ NIOSH Pocket Guide to Chemical Hazards. "#0214". National Institute for Occupational Safety and Health (NIOSH).
- NLM Hazardous Substances Data Bank entry for
- Alan Roy Katritzky, Otto Meth-Cohn, Thomas Lonsdale Gilchrist, Charles Wayne Rees (1995), Comprehensive Organic Functional Group Transformations: Carbon with Three Or ..., Elsevier, p. 226, ISBN 0-08-042704-9
{{citation}}: CS1 maint: multiple names: authors list (link) - Hodnebrog, Ø., M. Etminan, J. S. Fuglestvedt, G. Marston, G. Myhre, C. J. Nielsen, K. P. Shine, and T. J. Wallington (2013), ‘Global warming potentials and radiative efficiencies of halocarbons and related compounds: A comprehensive review,’ Reviews of Geophysics, vol. 51, pp. 300-378, doi:10.1002/rog.20013.
External links
- International Chemical Safety Card 1419
- NIOSH Pocket Guide to Chemical Hazards. "#0214". National Institute for Occupational Safety and Health (NIOSH).
- Photolysis of dibromodifluoromethane at 265 nm
- Raman and infrared spectra of solid dibromodifluoromethane
| Halomethanes | |
|---|---|
| Unsubstituted | |
| Monosubstituted | |
| Disubstituted | |
| Trisubstituted | |
| Tetrasubstituted | |
| * Chiral compound. | |