Tetrabromoethane

Tetrabromoethane (TBE) is a halogenated hydrocarbon, chemical formula C2H2Br4. Although three bromine atoms may bind to one of the carbon atoms creating 1,1,1,2-tetrabromoethane this is not thermodynamically favorable, so in practice tetrabromoethane is equal to 1,1,2,2-tetrabromoethane, where each carbon atom binds two bromine atoms.

Tetrabromoethane
Ball and stick model of tetrabromoethane
Spacefill model of tetrabromoethane
Names
IUPAC name
1,1,2,2-Tetrabromoethane[1]
Other names
  • Acetylene tetrabromide[2]
  • Muthmann's liquid
  • Tetrabromoacetylene[2]
  • Symmetrical tetrabromoethane[2]
Identifiers
3D model (JSmol)
Abbreviations TBE[2]
1098321
ChemSpider
ECHA InfoCard 100.001.083
EC Number
  • 201-191-5
MeSH 1,1,2,2-tetrabromoethane
RTECS number
  • KI8225000
UNII
UN number 2504
Properties
C2H2Br4
Molar mass 345.654 g·mol−1
Appearance Colourless liquid
Density 2.967 g mL−1
Melting point −1.0 °C; 30.3 °F; 272.2 K
Boiling point 243.6 °C; 470.4 °F; 516.7 K
630 mg L−1 (at 20 °C)
Vapor pressure 10 Pa (at 20 °C)
-123.4·10−6 cm3/mol
1.637
Thermochemistry
165.7 J K−1 mol−1
Hazards
Safety data sheet hells-confetti.com
GHS pictograms
GHS Signal word Danger
H319, H330, H412
P260, P273, P284, P305+351+338, P310
NFPA 704 (fire diamond)
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
1
3
1
Flash point 97 °C (207 °F; 370 K)
335 °C (635 °F; 608 K)
Lethal dose or concentration (LD, LC):
  • 1.2 g kg−1 (oral, rat)[3]
  • 5.25 g kg−1 (dermal, rat)
  • 0.4 g/kg (oral, guinea pig)[3]
  • 0.4 g/kg (oral, rabbit)[3]
  • 0.269 g/kg (oral, mouse)[3]
38 ppm (rat, 4 hr)[3]
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 1 ppm (14 mg/m3)[2]
REL (Recommended)
 None established[2]
IDLH (Immediate danger)
 8 ppm[2]
Related compounds
Related alkanes
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

Uses

The compound has no commercial use. It has an unusually high density for an organic compound, near 3 g/mL, due largely to the four bromine atoms.[4] TBE is a liquid at room temperature, and is used to separate mineral ores from its supporting rock by means of preferential flotation. Quartz, feldspar, calcite, dolomite and other minerals with low density will float in TBE, while minerals such as sphalerite, galena and pyrite will sink. A related compound, bromoform, is also sometimes used in these applications, however, TBE is more practical because of its wider liquid range and lower vapor pressure.[4]

Safety

Permissible exposure limit is 1 ppm.[5] Cases of acute TBE poisoning are known as well.[6]

References
  1. "1,1,2,2-tetrabromoethane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Identifiction. Retrieved 20 June 2012.
  2. NIOSH Pocket Guide to Chemical Hazards. "#0009". National Institute for Occupational Safety and Health (NIOSH).
  3. "Acetylene tetrabromide". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  4. Organic based heavy liquids, heavyliquids.com
  5. Dagani, M. J.; Barda, H. J.; Benya, T. J.; Sanders, D. C. "Bromine Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a04_405.
  6. A B van Haaften (1969). "Acute Tetrabromoethane (Acetylene Tetrabromide) Intoxication in Man". American Industrial Hygiene Association. 30 (3): 251–256. doi:10.1080/00028896909343119. PMID 5793994.
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