Antimony tribromide

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Antimony tribromide
BSbBr3structure.jpg
Identifiers
CAS number 7789-61-9 N
PubChem 24615
ChemSpider 23017 YesY
EC number 232-179-8
RTECS number CC4400000
Jmol-3D images Image 1
Image 2
Properties
Molecular formula SbBr3
Molar mass 361.472 g/mol
Appearance colorless to yellow crystals
hygroscopic
Density 4.35 g/cm3
Melting point 96.6 °C (205.9 °F; 369.8 K)
Boiling point 288 °C (550 °F; 561 K)
Solubility in water reacts
Solubility soluble in dilute HCl, HBr, CS2, acetone, benzene, chloroform, ammonia, alcohol
Refractive index (nD) 1.74
Dipole moment 2.47 D
Structure
Crystal structure Orthorhombic, oP16, SpaceGroup = Pnma, No. 62 (β form)
Thermochemistry
Specific
heat capacity
C
96 J/mol K
Std enthalpy of
formation
ΔfHo298
-259 kJ/mol
Hazards
EU classification not listed
LD50 7000 mg/kg
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

Antimony tribromide (SbBr3) is a chemical compound containing antimony in its +3 oxidation state.

Production[edit]

It may be made by the reaction of antimony with elemental bromine, or by the reaction of antimony trioxide with hydrobromic acid.

Alternatively, it can be prepared by the action of bromine on a mixture of antimony sulfide and antimony trioxide at 250 °C.

Uses[edit]

It can be added to polymers such as polyethylene as a fire retardant.[1] It is also used in the production of other antimony compounds, in chemical analysis, as a mordant, and in dyeing. [2]

Chemical Properties[edit]

Antimony tribromide has two crystalline forms, both having orthorhombic symmetries. When a warm carbon disulfide solution of SbBr3 is rapidly cooled, it crystallizes into the needle-like α-SbBr3, which then slowly converts to the more stable β form.[3]

Antimony tribromide hydrolyzes in water to form hydrobromic acid and antimony trioxide:

2 SbBr3 + 3 H2O → Sb2O3 + 6 HBr

References[edit]

  1. ^ Yang, Y. P.; D. G. Brewer; J. E. S. Venart (1991). "A study of the synergistic action of antimony oxide in fire-retardant polyethylene". Fire and Materials 15: 37. doi:10.1002/fam.810150107. 
  2. ^ "Antimony tribromide" http://cameochemicals.noaa.gov/chemical/2501
  3. ^ Okuda, Tsutomu; Terao, Hiromitsu; Ege, Osamu; Negita, Hisao (1970). "Structural Studies of Antimony Tribromide and Its Molecular Complex with Benzene by Means of the 81Br Nuclear Quadrupole Resonance". Bulletin of the Chemical Society of Japan 43 (8): 2398. doi:10.1246/bcsj.43.2398.