Dibromodifluoromethane
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Names | |
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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 | |
3D model (JSmol) | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.000.805 |
EC Number |
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PubChem CID | |
RTECS number |
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UNII | |
UN number | 1941 |
CompTox Dashboard (EPA) | |
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Properties | |
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) |
insoluble | |
log P | 1.99 |
Vapor pressure | 83 kPa at 20 °C |
Hazards | |
GHS labelling: | |
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Warning | |
H420 | |
P502 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable[1] |
NIOSH (US health exposure limits): | |
PEL (Permissible) | TWA 100 ppm (860 mg/m3)[1] |
REL (Recommended) | TWA 100 ppm (860 mg/m3)[1] |
IDLH (Immediate danger) | 2000 ppm[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
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
[edit]Dibromodifluoromethane can be obtained by vapor phase bromination of difluoromethane.[2]
It is also formed during the fluorination of carbon tetrabromide.[3]
Table of physical properties
[edit]Property | Value |
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Density, ρ, at 15 °C (liquid) | 2.3063 g/cm3 |
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[4] |
References
[edit]- ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0214". National Institute for Occupational Safety and Health (NIOSH).
- ^ NLM Hazardous Substances Data Bank entry for [ Dibromodifluoromethane]
- ^ 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
[edit]- 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