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Bismuth tribromide

Chemical compound From Wikipedia, the free encyclopedia

Bismuth tribromide
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Bismuth tribromide is an inorganic compound of bismuth and bromine with the chemical formula BiBr3.

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Preparation

It may be formed by the reaction of bismuth oxide and hydrobromic acid.[1]

Bi2O3 + 6 HBr ⇌ 2 BiBr3 + 3 H2O

Bismuth tribromide can also be produced by the direct oxidation of bismuth in bromine.[1]

2 Bi + 3 Br2 → 2 BiBr3

Structure

Bismuth tribromide adopts two different structures in the solid state: a low-temperature polymorph α-BiBr3 that is stable below 158 °C and a high-temperature polymorph β-BiBr3 that is stable above this temperature. Both polymorphs are monoclinic, but α-BiBr3 is in space group P21/a whereas β-BiBr3 is in C2/m. α-BiBr3 consists of pyramidal molecules whereas β-BiBr3 is polymeric and adopts the AlCl3 structure. BiBr3 is the only group 15 trihalide that can adopt both molecular and polymeric structures.[3]

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Reactivity

Bismuth bromide is highly water-soluble. It is a Lewis acid and accepts bromide ions to form monomeric and oligomeric anionic complexes (bromobismuthates), e.g. [BiBr6]3−, [Bi2Br10]4−, (BiBr
4
)n and (BiBr2−
5
)n.[4]

References

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