Bismuth tribromide
Chemical compound From Wikipedia, the free encyclopedia
Chemical compound From Wikipedia, the free encyclopedia
Bismuth tribromide is an inorganic compound of bismuth and bromine with the chemical formula BiBr3.
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Names | |||
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IUPAC name
bismuth bromide | |||
Other names
bismuth tribromide tribromobismuth tribromobismuthine tribromobismuthane bismuth(III) bromide | |||
Identifiers | |||
3D model (JSmol) |
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ChemSpider | |||
ECHA InfoCard | 100.029.201 | ||
EC Number |
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PubChem CID |
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UNII | |||
CompTox Dashboard (EPA) |
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Properties | |||
BiBr3 | |||
Molar mass | 448.692 g·mol−1 | ||
Appearance | white to light yellow or golden deliquescent crystals[1] | ||
Density | 5.72 g/cm3 at 25 °C[1] | ||
Melting point | 219 °C (426 °F; 492 K) [1] | ||
Boiling point | 462 °C (864 °F; 735 K) [1] | ||
Soluble, slow hydrolysis | |||
Solubility | diethyl ether, THF | ||
-147.0·10−6 cm3/mol | |||
Thermochemistry | |||
Std enthalpy of formation (ΔfH⦵298) |
−276[1] | ||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards |
corrosive[2] | ||
GHS labelling: | |||
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Danger | |||
H314 | |||
P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501 | |||
NFPA 704 (fire diamond) | |||
Related compounds | |||
Other anions |
bismuth trifluoride bismuth trichloride bismuth triiodide | ||
Other cations |
nitrogen tribromide phosphorus tribromide arsenic tribromide antimony tribromide aluminium tribromide iron(III) bromide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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It may be formed by the reaction of bismuth oxide and hydrobromic acid.[1]
Bismuth tribromide can also be produced by the direct oxidation of bismuth in bromine.[1]
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]
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]
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