Difference between revisions of "Caesium bromide"

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<span class="chemcoins" title="ctx_ver=Z39.88-2004&rft_val_fmt=http%3A%2F%2Fpluto.potsdam.edu%2Fwikichem%2Findex.php%2FWikiChem%3AChemCOinS&rft_id=LYQFWZFBNBDLEO-UHFFFAOYSA-M&rft_key=LYQFWZFBNBDLEO-REWHXWOFAA&rft_cas=7787-69-1"></span>
 
 
{{chembox
 
{{chembox
 
| ImageFile = Caesium-bromide-3D-ionic.png
 
| ImageFile = Caesium-bromide-3D-ionic.png
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| OtherNames = Cesium bromide,<br/>Caesium(I) bromide
 
| OtherNames = Cesium bromide,<br/>Caesium(I) bromide
 
| Section1 = {{Chembox Identifiers
 
| Section1 = {{Chembox Identifiers
 +
|  InChI = 1/BrH.Cs/h1H;/q;+1/p-1
 +
|  InChIKey = LYQFWZFBNBDLEO-REWHXWOFAA
 +
|  StdInChI = 1S/BrH.Cs/h1H;/q;+1/p-1
 +
|  StdInChIKey = LYQFWZFBNBDLEO-UHFFFAOYSA-M
 
|  CASNo = 7787-69-1
 
|  CASNo = 7787-69-1
 
|    CASNo_Ref = {{cascite}}
 
|    CASNo_Ref = {{cascite}}
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|  EINECS = 232-130-0
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|  EC-number = 232-130-0
 +
|  ChemSpiderID = 22994
 
|  PubChem = 24592
 
|  PubChem = 24592
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|  InChI = 1/BrH.Cs/h1H;/q;+1/p-1
 
 
   }}
 
   }}
 
| Section2 = {{Chembox Properties
 
| Section2 = {{Chembox Properties
 +
|  Reference = <ref>{{RubberBible62nd|page=B-91}}.</ref>
 
|  Formula = CsBr
 
|  Formula = CsBr
 
|  MolarMass = 212.81 g/mol
 
|  MolarMass = 212.81 g/mol
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|  MeltingPt = 636 °C
 
|  MeltingPt = 636 °C
 
|  BoilingPt = 1300 °C
 
|  BoilingPt = 1300 °C
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|  Solubility = 106.2 g/100 g (15 °C)<br/>124.3 g/100 g (25 °C)
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|  Solubility = 124.3 g/100 ml (25 °C)
 +
|  RefractIndex = 1.6984
 
   }}
 
   }}
 
| Section3 = {{Chembox Structure
 
| Section3 = {{Chembox Structure
 
|  CrystalStruct = [[Caesium chloride|CsCl]]
 
|  CrystalStruct = [[Caesium chloride|CsCl]]
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|  Coordination = 8–8
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|  SpaceGroup = Pm3m, No. 221
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|  LattConst_a = 429.53 pm
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|  Coordination = Cubic (Cs<sup>+</sup>)<br/>Cubic (Br<sup>−</sup>)
 
   }}
 
   }}
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| Section4 = {{Chembox Hazards
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| Section7 = {{Chembox Hazards
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|  EUIndex = Not listed
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|  ExternalMSDS = [http://physchem.ox.ac.uk/MSDS/CA/caesium_bromide.html External MSDS]
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|  RPhrases =
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|  EUIndex = not listed
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|  SPhrases =  
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|  FlashPt = non-flammable
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|  FlashPt = Non-flammable
 
 
   }}
 
   }}
 
| Section8 = {{Chembox Related
 
| Section8 = {{Chembox Related
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|  OtherAnions = [[Caesium fluoride]],<br/>[[Caesium chloride]],<br/>[[Caesium iodide]]
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|  OtherAnions = [[Caesium fluoride]]<br/>[[Caesium chloride]]<br/>[[Caesium iodide]]
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|  OtherCations = [[Sodium bromide]],<br/>[[Potassium bromide]]<br/>[[Rubidium bromide]]
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|  OtherCations = [[Lithium bromide]]<br/>[[Sodium bromide]]<br/>[[Potassium bromide]]<br/>[[Rubidium bromide]]
 +
|  OtherCpds = [[Caesium bromate]]<br/>[[Caesium perbromate]]
 
   }}
 
   }}
 
}}
 
}}
  
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'''Caesium bromide''', (CsBr), is an ionic [[chemical compound|compound]] of [[caesium]] and [[bromine]]. It has body-centered cubic crystallic structure of [[caesium chloride]] type with [[space group]] ''Pm3m'' and [[lattice constant]] ''a'' = 0.42953 nm. Distance between Cs and Br atoms is 0.30372 nm.
+
'''Caesium bromide''', (CsBr), is an ionic [[chemical compound|compound]] of [[caesium]] and [[bromine]]. It has the [[caesium chloride]] structure, with a caesium–bromine distance of 303.72&nbsp;nm.
  
 
== Synthesis ==
 
== Synthesis ==
 
It can be prepared via following reactions:
 
It can be prepared via following reactions:
 
* [[Neutralisation]]:
 
* [[Neutralisation]]:
−
: CsOH (aq) + HBr (aq) → CsBr (aq) + H<sub>2</sub>O (l)
+
:CsOH + HBr → CsBr + H<sub>2</sub>O
−
: Cs<sub>2</sub>(CO<sub>3</sub>) (aq) + 2 HBr (aq) → 2 CsBr (aq) + H<sub>2</sub>O (l) + CO<sub>2</sub> (g)
+
:Cs<sub>2</sub>(CO<sub>3</sub>) + 2HBr → 2CsBr + H<sub>2</sub>O + CO<sub>2</sub>
 
* Direct synthesis:
 
* Direct synthesis:
−
: 2 Cs (s) + Br<sub>2</sub> (g) → 2 CsBr (s)
+
:2Cs + Br<sub>2</sub> → 2CsBr
 
The direct synthesis is vigorous reaction as reaction of caesium with other halogens. Due to its expensiveness, it is not used for preparation.
 
The direct synthesis is vigorous reaction as reaction of caesium with other halogens. Due to its expensiveness, it is not used for preparation.
  
 
== Uses ==
 
== Uses ==
−
Caesium bromide is sometimes used in optics as a [[beamsplitter]] component in wide-band [[spectrophotometers]].
+
Caesium bromide is sometimes used in optics as a [[prism]] or [[beamsplitter]] component in wide-band [[spectrophotometers]] due to its good transparency to [[infrared]] radiation.<ref name="Kirk-Othmer">{{Kirk-Othmer | first1 = S. D. | last1 = Ukeles | first2 = M. | last2 = Freiberg | contribution = Bromine, Inorganic Compounds | doi = 10.1002/0471238961.021815131001031 | year = 2002}}.</ref> it has also been unsed in X-ray fluorescent screens.<ref name="Kirk-Othmer"/>
  
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== See also ==
+
== References ==
−
* [[Caesium fluoride]]
+
{{reflist}}
−
* [[Caesium chloride]]
 
−
* [[Caesium iodide]]
 
  
 
== External links ==
 
== External links ==
−
* [http://physchem.ox.ac.uk/MSDS/CA/caesium_bromide.html MSDS at Oxford University]
 
 
* [http://www.crystran.co.uk/products.asp?productid=91 Physical data], [http://wonwoosystem.co.kr/product/crystran/pdf/Caesium_Bromide(CsBr).pdf PDF version]
 
* [http://www.crystran.co.uk/products.asp?productid=91 Physical data], [http://wonwoosystem.co.kr/product/crystran/pdf/Caesium_Bromide(CsBr).pdf PDF version]
 
* [http://www.webelements.com/webelements/compounds/text/Cs/Br1Cs1-7787691.html Caesium bromide at webelements.com]
 
* [http://www.webelements.com/webelements/compounds/text/Cs/Br1Cs1-7787691.html Caesium bromide at webelements.com]
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* [http://doc.cern.ch/tmp/convert_SCAN-9806049.pdf Ultra-violet photoabsorption measurements in alkali iodide and caesium bromide evaporated films]
 
* [http://doc.cern.ch/tmp/convert_SCAN-9806049.pdf Ultra-violet photoabsorption measurements in alkali iodide and caesium bromide evaporated films]
  
 +
[[Category:Caesium compounds]]
 
[[Category:Bromides]]
 
[[Category:Bromides]]
−
[[Category:Caesium compounds]]
 
  
 
{{Imported from Wikipedia|name=Caesium bromide|id=279984605}}
 
{{Imported from Wikipedia|name=Caesium bromide|id=279984605}}

Latest revision as of 09:06, 9 January 2011

Caesium bromide
Caesium-bromide-3D-ionic.png
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[1]
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)
Refractive index (nD) 1.6984
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
Other compounds Caesium bromate
Caesium perbromate
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:

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 prism or beamsplitter component in wide-band spectrophotometers due to its good transparency to infrared radiation.[2] it has also been unsed in X-ray fluorescent screens.[2]

References

  1. ↑ CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-91. ISBN 0-8493-0462-8.
  2. ↑ 2.0 2.1 Ukeles, S. D.; Freiberg, M. Bromine, Inorganic Compounds. In Kirk-Othmer Encyclopedia of Chemical Technology; John Wiley: New York, 2002. DOI: 10.1002/0471238961.021815131001031.

External links

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