Caesium bromide

Caesium bromide

Names
IUPAC name Caesium bromide
Other names Cesium bromide, Caesium(I) bromide
Identifiers
CAS Number	7787-69-1 Y
ChemSpider	22994 Y
EC Number	232-130-0
Jmol 3D model	Interactive image
PubChem	24592
InChI InChI=1S/BrH.Cs/h1H;/q;+1/p-1 Y Key: LYQFWZFBNBDLEO-UHFFFAOYSA-M Y InChI=1/BrH.Cs/h1H;/q;+1/p-1 Key: LYQFWZFBNBDLEO-REWHXWOFAA
SMILES [Cs+].[Br-]
Properties
Chemical formula	CsBr
Molar mass	212.81 g/mol
Appearance	White solid
Density	4.44 g/cm3, solid
Melting point	636 °C (1,177 °F; 909 K)
Boiling point	1,300 °C (2,370 °F; 1,570 K)
Solubility in water	1062 g/L (15 °C) 1243 g/L (25 °C)
Structure
Crystal structure	CsCl
Coordination geometry	8–8
Vapor pressure	{{{value}}}
Related compounds
Other anions	Caesium fluoride Caesium chloride Caesium iodide Caesium astatide
Other cations	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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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.

Synthesis

It can be prepared via following reactions:

• Neutralization:

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

• Caesium fluoride
• Caesium chloride
• Caesium iodide

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