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Antimony tribromide

Antimony tribromide
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IUPAC name
tribromostibane
Other names
Antimony(III) bromide
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7789-61-9 7pxN
ChemSpider 23017 7pxY
EC number 232-179-8
Jmol-3D images Image
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PubChem Template:Chembox PubChem/format
RTECS number CC4400000
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SbBr3
Molar mass 361.472 g/mol
Appearance colorless to yellow crystals
hygroscopic
Density 4.35 g/cm3
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reacts
Solubility soluble in dilute HCl, HBr, CS2, acetone, benzene, chloroform, ammonia, alcohol
1.74
Dipole moment 2.47 D
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Crystal structure Orthorhombic, oP16, SpaceGroup = Pnma, No. 62 (β form)
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96 J/mol K
-259 kJ/mol
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EU classification not listed
7000 mg/kg
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

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

Production

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

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

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

  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. 

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