Caesium bromide

Caesium bromide
IUPAC name	Caesium bromide
Other names	Cesium bromide, Caesium(I) bromide
Identifiers
InChI	InChI=1/BrH.Cs/h1H;/q;+1/p-1
InChIKey	LYQFWZFBNBDLEO-REWHXWOFAA
Standard InChI	InChI=1S/BrH.Cs/h1H;/q;+1/p-1
Standard InChIKey	LYQFWZFBNBDLEO-UHFFFAOYSA-M
CAS number	[7787-69-1]
EC number	232-130-0
ChemSpider	22994
PubChem	24592
Properties
Chemical 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	124.3 g/100 ml (25 °C)
Structure
Crystal structure	CsCl
Space group	Pm3m, No. 221
Lattice constant	a = 429.53 pm
Coordination geometry	Cubic (Cs+) Cubic (Br−)
Hazards
Material safety data sheet (MSDS)	External MSDS
EU index number	not listed
Flash point	non-flammable
Related compounds
Other anions	Caesium fluoride Caesium chloride Caesium iodide
Other cations	Lithium bromide Sodium bromide Potassium bromide Rubidium bromide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Caesium bromide, (CsBr), is an ionic compound of caesium and bromine. It has the caesium chloride structure, with a caesium–bromine distance of 303.72 nm.

Synthesis

It can be prepared via following reactions:

• Neutralisation:

CsOH + HBr → CsBr + H₂O

Cs₂(CO₃) + 2HBr → 2CsBr + H₂O + CO₂

• Direct synthesis:

2Cs + Br₂ → 2CsBr

The direct synthesis is vigorous reaction as 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.

External links

• Physical data, 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

<cml title="Caesium_bromide">

<molecule id="Caesium_bromide1">
 <atomArray>
  <atom id="cs1" elementType="Cs" hydrogenCount="0" formalCharge="+1"/>
  <atom id="br1" elementType="Br" hydrogenCount="0" formalCharge="-1"/>
 </atomArray>
 <name convention="IUPAC">caesium bromide</name>
 <formula concise="Br 1 Cs 1"/>
 <formula title="Cs+ Br-">
  <formula formalCharge="+1">
   <atomArray elementType="Cs"/>
  </formula>
  </formula formalCharge="-1">
   <atomArray elementType="Br"/>
  </formula>
 </formula>
 <identifier>InChI=1/BrH.Cs/h1H;/q;+1/p-1</identifier>
 <identifier>InChI=1S/BrH.Cs/h1H;/q;+1/p-1</identifier>
 <property state="solid"/>
</molecule>

</cml>