Dibromodifluoromethane

Last updated
Dibromodifluoromethane
Dibromodifluoromethane.png
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 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 200-885-5
PubChem CID
RTECS number
  • PA7525000
UNII
UN number 1941
  • InChI=1S/CBr2F2/c2-1(3,4)5 Yes check.svgY
    Key: AZSZCFSOHXEJQE-UHFFFAOYSA-N Yes check.svgY
  • InChI=1/CBr2F2/c2-1(3,4)5
  • BrC(F)(F)Br
Properties
CBr2F2
Molar mass 209.82 g/mol
AppearanceColourless 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:
GHS-pictogram-exclam.svg
Warning
H420
P502
NFPA 704 (fire diamond)
NFPA 704.svgHealth 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).
Yes check.svgY  verify  (what is  Yes check.svgYX mark.svgN ?)

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).

Contents

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

PropertyValue
Density, ρ, at 15 °C (liquid)2.3063 g/cm3
Critical temperature, Tc198.3 °C, 471.3 K
Critical pressure, pc4.13 MPa, 40.8 bar
Refractive index, n at 20 °C, D1.398
Dipole moment 0.7 D
Ozone depletion potential, ODP0.4, CCl3F is 1
Global warming potential, GWP231, CO2 is 1 [4]

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References

  1. 1 2 3 4 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.