Caesium bromide

Caesium bromide
IUPAC name Caesium bromide
Other names Cesium bromide, Caesium(I) bromide
Identifiers
CAS number	7787-69-1 Y
PubChem	24592
ChemSpider	22994 Y
EC number	232-130-0
Jmol-3D images	Image 1
SMILES [Cs+].[Br-]
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
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
Other cations	Sodium bromide, Potassium bromide Rubidium bromide
Y bromide (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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. Distance between Cs and Br atoms 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 expensiveness, 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