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 Edit this at Wikidata
EC Number
  • 200-885-5
RTECS number
  • PA7525000
UNII
UN number 1941
  • InChI=1S/CBr2F2/c2-1(3,4)5 checkY
    Key: AZSZCFSOHXEJQE-UHFFFAOYSA-N checkY
  • InChI=1/CBr2F2/c2-1(3,4)5
  • BrC(F)(F)Br
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
GHS labelling:
GHS07: Exclamation mark
Warning
H420
P502
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
0
0
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).
checkY verify (what is checkY☒N ?)

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.[2]

It is also formed during the fluorination of carbon tetrabromide.[3]

Table of physical properties

Property Value
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

  1. ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0214". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ NLM Hazardous Substances Data Bank entry for [ Dibromodifluoromethane]
  3. ^ 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)
  4. ^ 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.