Arsenic tribromide

Arsenic tribromide
Preferred IUPAC name

Arsenic tribromide
Systematic name

Tribromoarsane
Other names

Arsenic(III) bromide
Arsenous bromide
Identifiers
CAS number 7784-33-0 Y
PubChem 24569 Y
ChemSpider 22973 Y
EC number 232-057-4
RTECS number CG1375000
Jmol-3D images Image 1
Properties
Molecular formula AsBr3
Molar mass 314.634 g/mol
Appearance white to pale yellow crystalline solid
Density 3.40 g/cm3
Melting point

31.1 °C
Boiling point

221 °C
Solubility in water decompose
Refractive index (nD) 2.3
Related compounds
Related compounds Phosphorus tribromide
arsenic trichloride
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Arsenic tribromide is the chemical compound with the formula AsBr3. This pyramidal molecule is the only known binary arsenic bromide. It is formed by the direct reaction of bromine and arsenic. AsBr3 is noteworthy for its very high refractive index of approximately 2.3. It also has a very high diamagnetic susceptibility.[1]

Bromides of arsenic

AsBr5 is not known, although the corresponding phosphorus compound PBr5 is well characterized. AsBr3 is the parent for a series of hypervalent anionic bromoarsenates including [As2Br8]2−, [As2Br9]3−, and [As3Br12]3−.[2]

Organoarsenic bromides, (CH3)2AsBr and (CH3)AsBr2 are formed efficiently by the copper-catalyzed reaction of methyl bromide with hot arsenic metal. This synthesis is similar to the direct process used for the synthesis of methyl chlorosilanes.

Arsenic tribromide is toxic, as are all arsenic compounds.

References

  1. ^ CRC handbook of Chemistry and Physics, CRC Press
  2. ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.