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
PubChem	24569 Y
ChemSpider	22973 Y
EC number	232-057-4
RTECS number	CG1375000
Jmol-3D images	Image 1
SMILES Br[As](Br)Br
InChI InChI=1S/AsBr3/c2-1(3)4 Y Key: JMBNQWNFNACVCB-UHFFFAOYSA-N Y InChI=1S/AsBr3/c2-1(3)4 Key: JMBNQWNFNACVCB-UHFFFAOYSA-N InChI=1/AsBr3/c2-1(3)4 Key: JMBNQWNFNACVCB-UHFFFAOYAH
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
Y tribromide (verify) (what is: Y/N?) 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.