Bismuth tribromide

α polymorph

β polymorph

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Names
IUPAC name

bismuth bromide

Other names

bismuth tribromide
tribromobismuth
tribromobismuthine
tribromobismuthane
bismuth(III) bromide

Identifiers

CAS Number

* 7787-58-8

3D model (JSmol)

* Interactive image

ChemSpider |

* 74210

EC Number |

* 232-121-1

PubChem CID

* 82232

UNII |

* DT59198T2X

InChI

* InChI=1S/Bi.3BrH/h;3*1H/q+3;;;/p-3

Key: TXKAQZRUJUNDHI-UHFFFAOYSA-K

* InChI=1/Bi.3BrH/h;3*1H/q+3;;;/p-3

Key: TXKAQZRUJUNDHI-DFZHHIFOAX

SMILES

* Br[Bi](Br)Br

Properties

Chemical formula

| 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]

Solubility in water

| Soluble, slow hydrolysis
Solubility | diethyl ether, THF

Magnetic susceptibility (χ)

| -147.0·10−6 cm3/mol
Thermochemistry

Std enthalpy of
formation (ΔfH⦵298)

| −276[1]
Hazards
Main hazards | corrosive[2]
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H314

GHS precautionary statements

| P260, P264, P280, P301+330+331, P303+361+353, P304+340, P305+351+338, 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).

Infobox references

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

## Contents

* 1 Preparation
* 2 Structure
* 3 Reactivity
* 4 References

## Preparation

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

3 \+ 6 HBr ⇌ 2 BiBr
3 \+ 3 H

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

2 Bi + 3 Br
2 → 2 BiBr

## 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]

## 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

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 558-561. ISBN 978-0-08-037941-8.
2. ↑ "Sigma-Aldrich: 654981 Bismuth(III) bromide anhydrous, powder, 99.999% trace metals basis". Archived from the original on 2012-02-11. https://web.archive.org/web/20120211185950/http://www.sigmaaldrich.com/catalog/ProductDetail.do?lang=en#x7C;ALDRICH&=N5&.
3. ↑ von Benda, Heike (1980). "Zur Polymorphie des Wismuttribromids". Zeitschrift für Kristallographie - Crystalline Materials 151 (1–4): 271–286. doi:10.1524/zkri.1980.151.14.271.
4. ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 564-568. ISBN 978-0-08-037941-8.

* v
* t
* e

Bismuth compounds

Bismuth(III)|

* BiBr3
* BiCl3
* Bi4Ge3O12
* BiOCl
* Bi2Se3
* Bi12SiO20
* Bi2O2(CO3)
* Bi2Te3
* BiF3
* BiI3
* Bi(NO3)3
* Bi2O3
* Bi(OH)3
* Bi2S3
* BiH3
* BiOHOCOC6H4O

| Organobismuth(III)|

* C4H4BiH

|

Bismuth(V)|

* NaBiO3
* BiF5
* Bi2O5

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*[CID]: Compound ID
*[H314]: Causes severe skin burns and eye damage
*[P260]: Do not breathe dust/fume/gas/mist/vapours/spray
*[P264]: Wash … thoroughly after handling
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
*[P301+330+331]: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
*[P303+361+353]: IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower
*[P304+340]: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
*[P305+351+338]: IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing
*[P310]: Immediately call a POISON CENTER or doctor/physician
*[P321]: Specific treatment (see … on this label)
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