Dibromodifluoromethane

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
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.000.805
EC Number 200-885-5
RTECS number PA7525000
Properties
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)
Insoluble
log P 1.99
Vapor pressure 83 kPa at 20 °C
Hazards
Main hazards Dangerous for the environment (N)
S-phrases (outdated) S23, S24/25
NFPA 704
Flammability code 0: Will not burn. E.g., waterHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
2
0
Flash point nonflammable [1]
US health exposure limits (NIOSH):
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

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

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)

References

  1. 1 2 3 4 "NIOSH Pocket Guide to Chemical Hazards #0214". National Institute for Occupational Safety and Health (NIOSH).
  • 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
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