Caesium bromide
Appearance
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Names | |
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IUPAC name
Caesium bromide
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Other names
Cesium bromide,
Caesium(I) bromide | |
Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.029.209 |
EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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Properties | |
CsBr | |
Molar mass | 212.81 g/mol |
Appearance | White solid |
Density | 4.44 g/cm3, solid |
Melting point | 636 °C |
Boiling point | 1300 °C |
1062 g/L (15 °C) 1243 g/L (25 °C) | |
Structure | |
CsCl | |
8–8 | |
Hazards | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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1400 mg/kg (oral, rat)[1] |
Related compounds | |
Other anions
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Caesium fluoride Caesium chloride Caesium iodide Caesium astatide |
Other cations
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Sodium bromide Potassium bromide Rubidium 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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Caesium bromide, (CsBr), is an ionic compound of caesium and bromine. It has simple cubic p-type cubic crystallic structure, comparable to that of caesium chloride type with space group Pm3m and lattice constant a = 0.42953 nm. The distance between Cs+ and Br− ions is 0.37198 nm.
Synthesis
It can be prepared via following reactions:
- CsOH (aq) + HBr (aq) → CsBr (aq) + H2O (l)
- Cs2(CO3) (aq) + 2 HBr (aq) → 2 CsBr (aq) + H2O (l) + CO2 (g)
- Direct synthesis:
- 2 Cs (s) + Br2 (g) → 2 CsBr (s)
The direct synthesis is a vigorous reaction of caesium with other halogens. Due to its high cost, it is not used for preparation.
Uses
Caesium bromide is sometimes used in optics as a beamsplitter component in wide-band spectrophotometers.
See also
References
External links
- MSDS at Oxford University
- Physical data, Crystran PDF version, PDF version
- Caesium bromide at webelements.com
- Relaxed Excited States Origin and Structure in Lead-Doped Caesium Bromide
- IR transmission spectrum
- Ultra-violet photoabsorption measurements in alkali iodide and caesium bromide evaporated films