Caesium bromide

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Caesium bromide
IUPAC name

Caesium bromide

Other names

Cesium bromide,
Caesium(I) bromide

Identifiers
CAS number 7787-69-1 YesY
PubChem 24592
ChemSpider 22994 YesY
EC number 232-130-0
Jmol-3D images {{#if:[Cs+].[Br-]|Image 1
Properties
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)
Structure
Crystal structure CsCl
Coordination
geometry		 8–8
Hazards
EU Index Not listed
Flash point Non-flammable
Related compounds
Other anions Caesium fluoride
Caesium chloride
Caesium iodide
Caesium astatide
Other cations Sodium bromide
Potassium bromide
Rubidium bromide
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Cesium bromide, (CsBr), is an ionic compound of cesium 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

External links

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