Tetrabromoethane

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Tetrabromoethane
Seletal formula of tetrabromoethane
Stereo, skeletal formula of tetrabromoethane with all explicit hydrogens added
Ball and stick model of tetrabromoethane Spacefill model of tetrabromoethane
Identifiers
Abbreviations TBE[2]
CAS number 79-27-6 YesY
PubChem 6588
ChemSpider 6339 YesY
EC number 201-191-5
UN number 2504
MeSH 1,1,2,2-tetrabromoethane
RTECS number KI8225000
Beilstein Reference 1098321
Jmol-3D images Image 1
Properties
Molecular formula C2H2Br4
Molar mass 345.65 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
Solubility in water 630 mg L−1 (at 20 °C)
Vapor pressure 10 Pa (at 20 °C)
Refractive index (nD) 1.637
Thermochemistry
Specific
heat capacity
C
165.7 J K−1 mol−1
Hazards
MSDS hells-confetti.com
GHS pictograms The skull-and-crossbones pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word DANGER
GHS hazard statements H319, H330, H412
GHS precautionary statements P260, P273, P284, P305+351+338, P310
EU Index 602-016-00-9
EU classification Very Toxic T+
R-phrases R26, R36, R52/53
S-phrases (S1/2), S24, S27, S45
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 97 °C (207 °F; 370 K)
LD50
  • 1.2 g kg−1 (oral, rat)
  • 5.25 g kg−1 (dermal, rat)
Related compounds
Related alkanes
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

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.

It has an unusually high density for an organic compound, near 3 g/mL, due largely to the four bromine atoms.[3] TBE is a liquid at room temperature, and is used to separate mineral ores from its supporting rock by means of preferential flotation. Sand, limestone, dolomite, and other types of rock material will float on 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.[3] Acute TBE poisoning has been known to occur.[4]

References[edit]

  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. ^ a b CDC - NIOSH Pocket Guide to Chemical Hazards
  3. ^ a b Organic based heavy liquids, heavyliquids.com
  4. ^ A B van Haaften (1969). "Acute tetrabromoethane (acetylene tetrabromide) intoxication in man". American Industrial Hygiene Association 30 (3): 251–256. doi:10.1080/0002889698506042.