Dibromodifluoromethane

Dibromodifluoromethane is a mixed halomethane. It is a colorless non-flammable liquid.

Dibromodifluoromethane
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
EC Number
  • 200-885-5
PubChem CID
RTECS number
  • PA7525000
UNII
UN number 1941
CompTox Dashboard (EPA)
Properties
Chemical formula
 CBr2F2
Molar mass 209.82 g/mol
Appearance Colourless gas/liquid
Density 8.7 kg/m3 (for gas)

2.27 g/cm3 (for liquid)

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 pictograms
GHS Signal word Warning
GHS hazard statements
 H420
GHS precautionary statements
 P502
NFPA 704 (fire diamond)
0
2
0
Flash point nonflammable [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).
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Infobox references

Along with Halons 1211, 2402, and 1301, it is the most effective fire extinguishers, however, also the most toxic one.

It is a class I ozone depleting substance (ODS).

Table of physical properties
Property Value
Density (ρ) at 15 °C (liquid) 2.3063 g.cm−3
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 = 1)
Global warming potential (GWP) 231 (CO2 = 1)[2]

References
  1. NIOSH Pocket Guide to Chemical Hazards. "#0214". National Institute for Occupational Safety and Health (NIOSH).
  2. 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.