Caesium bromide

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Caesium bromide
CAS number 7787-69-1 YesY
PubChem 24592
ChemSpider 22994 YesY
EC number 232-130-0
Jmol-3D images Image 1
Molecular formula CsBr
Molar mass 212.81 g/mol
Appearance White solid
Density 4.44 g/cm3, solid
Melting point 636 °C
Boiling point 1300 °C
Solubility in water 1062 g/L (15 °C)
1243 g/L (25 °C)
Crystal structure CsCl
EU Index Not listed
Flash point Non-flammable
LD50 1400 mg/kg (oral, rat)[1]
Related compounds
Other anions Caesium fluoride
Caesium chloride
Caesium iodide
Caesium astatide
Other cations Sodium bromide
Potassium bromide
Rubidium bromide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

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.


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.


Caesium bromide is sometimes used in optics as a beamsplitter component in wide-band spectrophotometers.

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