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{{chembox
{{chembox
| Watchedfields = changed
| verifiedrevid = 401939356
| verifiedrevid = 443321289
⚫
| ImageFile = Caesium-bromide-3D-ionic.png
| ImageFile = CsCl polyhedra.png
| ImageSize = 200px
| ImageSize =
⚫
| IUPACName = Caesium bromide
⚫
| ImageFile1 = Caesium-bromide-3D-ionic.png
⚫
| IUPACName = Cesium bromide
| OtherNames = Cesium bromide,<br/>Caesium(I) bromide
| OtherNames = Cesium bromide,<br/>Caesium(I) bromide
| Section1 = {{Chembox Identifiers
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 22994
| ChemSpiderID = 22994
| SMILES = [Cs+].[Br-]
| SMILES = [Cs+].[Br-]
| InChIKey = LYQFWZFBNBDLEO-REWHXWOFAA
| InChIKey = LYQFWZFBNBDLEO-REWHXWOFAA
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/BrH.Cs/h1H;/q;+1/p-1
| StdInChI = 1S/BrH.Cs/h1H;/q;+1/p-1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = LYQFWZFBNBDLEO-UHFFFAOYSA-M
| StdInChIKey = LYQFWZFBNBDLEO-UHFFFAOYSA-M
| CASNo = 7787-69-1
| CASNo = 7787-69-1
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo_Ref = {{cascite|correct|CAS}}
| EINECS = 232-130-0
| EINECS = 232-130-0
| PubChem = 24592
| RTECS = FK9275000
| UNII = 06M25EDM3F
⚫
| InChI = 1/BrH.Cs/h1H;/q;+1/p-1
| PubChem = 24592
⚫
| InChI = 1/BrH.Cs/h1H;/q;+1/p-1
}}
}}
| Section2 = {{Chembox Properties
|Section2={{Chembox Properties
| Formula = CsBr
| Formula = CsBr
| MolarMass = 212.81 g/mol
| MolarMass = 212.809 g/mol<ref name=r1>Haynes, p. 4.57</ref>
| Appearance = White solid
| Appearance = White solid
| Density = 4.44 g/cm<sup>3</sup>, solid
| Density = 4.43 g/cm<sup>3</sup><ref name=r1/>
| MeltingPt = 636 °C
| MeltingPtC = 636
| MeltingPt_ref = <ref name=r1/>
| BoilingPt = 1300 °C
| BoilingPtC = 1300
⚫
| Solubility = 1062 g/L (15 °C)<br/>1243 g/L (25 °C)
| BoilingPt_ref = <ref name=r1/>
⚫
| Solubility = 1230 g/L (25 °C)<ref name=r1/> Disputed.
420 g/L (11 °C) See References<br/> 560 /L (15°C)<br/>1020 g/L (28.5 °C)<br/>1180 g/L (31 °C)<br/>1240 g/L (32.5 °C)<br/>1380 g/L (35 °C)
| RefractIndex = 1.8047 (0.3 μm)<br/>1.6974 (0.59 μm)<br/>1.6861 (0.75 μm)<br/>1.6784 (1 μm)<br/>1.6678 (5 μm)<br/>1.6439 (20 μm)<ref>Haynes, p. 10.240</ref>
| MagSus = -67.2·10<sup>−6</sup> cm<sup>3</sup>/mol<ref>Haynes, p. 4.132</ref>
}}
}}
| Section3 = {{Chembox Structure
|Section3={{Chembox Structure
| CrystalStruct = [[Caesium chloride|CsCl]]
| CrystalStruct = [[Caesium chloride|CsCl]], [[Pearson symbol|cP2]]
| SpaceGroup = Pm{{overline|3}}m, No. 221<ref name=str2>{{cite journal|doi=10.1063/1.1713597|title=Elastic Constants of CsBr and CsI from 4.2K to Room Temperature|journal=Journal of Applied Physics|volume=35|issue=4|pages=1222|year=1964|last1=Vallin|first1=J.|last2=Beckman|first2=O.|last3=Salama|first3=K.|bibcode=1964JAP....35.1222V}}</ref>
| Coordination = 8–8
| LattConst_a = 0.4291 nm
| UnitCellFormulas = 1
| UnitCellVolume =0.0790 nm<sup>3</sup>
| Coordination = Cubic (Cs<sup>+</sup>)<br/>Cubic (Br<sup>−</sup>)
}}
}}
| Section4 = {{Chembox Hazards
|Section4={{Chembox Hazards
| EUIndex = Not listed
| NFPA-H = 2
| RPhrases =
| NFPA-F = 0
| SPhrases =
| NFPA-R = 0
| GHSSignalWord=Warning
⚫
| FlashPt = Non-flammable
| GHSPictograms={{GHS07}}
| HPhrases = {{H-phrases|302|315|319|335}}
| PPhrases = {{P-phrases|261|264|270|271|280|301+312|302+352|304+340|305+351+338|312|321|330|332+313|337+313|362|403+233|405|501}}
⚫
| FlashPt = Non-flammable
| LD50 = 1400 mg/kg (oral, rat)<ref>[https://chem.nlm.nih.gov/chemidplus/rn/7787-69-1 Caesium bromide]. nlm.nih.gov</ref>
}}
}}
| Section8 = {{Chembox Related
|Section8={{Chembox Related
| OtherAnions = [[Caesium fluoride]],<br/>[[Caesium chloride]],<br/>[[Caesium iodide]]
| OtherAnions = [[Caesium fluoride]]<br/>[[Caesium chloride]]<br/>[[Caesium iodide]]<br/>[[Caesium astatide]]
| OtherCations = [[Sodium bromide]],<br/>[[Potassium bromide]]<br/>[[Rubidium bromide]]
| OtherCations = [[Sodium bromide]]<br/>[[Potassium bromide]]<br/>[[Rubidium bromide]]<br/>[[Francium bromide]]
}}
}}
}}
}}


'''Caesium bromide''', (CsBr), is an ionic [[chemical compound|compound]] of [[caesium]] and [[bromine]]. It has simple cubic p-type cubic crystallic structure, comparable to that of [[caesium chloride]] type with [[space group]] ''Pm{{overline|3}}m'' and [[lattice constant]] ''a'' = 0.42953 nm. Distance between Cs and Br atoms is 0.37198 nm.
'''Caesium bromide''' or '''cesium bromide''' is an ionic [[chemical compound|compound]] of [[caesium]] and [[bromine]] with the [[chemical formula]] CsBr. It is a white or transparent solid with melting point at 636&nbsp;°C that readily dissolves in water. Its bulk crystals have the cubic CsCl structure, but the structure changes to the [[rocksalt]] type in nanometer-thin film grown on [[mica]], LiF, KBr or NaCl substrates.<ref name=str>{{cite journal|doi=10.1107/S0365110X51001641|title=Polymorphism of cesium and thallium halides|journal=Acta Crystallographica|volume=4|issue=6|pages=487–489|year=1951|last1=Schulz|first1=L. G.|bibcode=1951AcCry...4..487S }}</ref>


== Synthesis ==
== Synthesis ==
It can be prepared via following reactions:
Caesium bromide can be prepared via following reactions:
* [[Neutralization]]:
* [[Neutralization (chemistry)|Neutralization]]:
: CsOH (aq) + HBr (aq) → CsBr (aq) + H<sub>2</sub>O (l)
: CsOH (aq) + HBr (aq) → CsBr (aq) + H<sub>2</sub>O (l)
: 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>) (aq) + 2 HBr (aq) → 2 CsBr (aq) + H<sub>2</sub>O (l) + CO<sub>2</sub> (g)
* Direct synthesis:
* Direct synthesis:
: 2 Cs (s) + Br<sub>2</sub> (g) → 2 CsBr (s)
: 2 Cs (s) + Br<sub>2</sub> (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.
The direct synthesis is a vigorous reaction of caesium with bromine. Due to its high cost, 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 [[beamsplitter]] component in wide-band [[spectrophotometers]].


== See also ==
==References==
{{Reflist}}<br/>* [http://www.crystran.co.uk/caesium-bromide-csbr.htm Crystran Ltd experimental data July 2021] {{Webarchive|url=https://web.archive.org/web/20121218002818/http://www.crystran.co.uk/caesium-bromide-csbr.htm |date=2012-12-18 }}
* [[Caesium fluoride]]

⚫
* [[Caesium chloride]]
==Cited sources==
* [[Caesium iodide]]
*{{RubberBible92nd}}


== External links ==
== External links ==
{{Commons category|Caesium bromide}}
* [http://physchem.ox.ac.uk/MSDS/CA/caesium_bromide.html MSDS at Oxford University]
* [http://physchem.ox.ac.uk/MSDS/CA/caesium_bromide.html MSDS at Oxford University] {{Webarchive|url=https://web.archive.org/web/20071017044744/http://physchem.ox.ac.uk/MSDS/CA/caesium_bromide.html |date=2007-10-17 }}
* [http://www.crystran.co.uk/caesium-bromide-csbr.htm Physical data], [http://www.crystran.co.uk/getfile.php?file=104 Crystran PDF version], [http://wonwoosystem.co.kr/product/crystran/pdf/Caesium_Bromide(CsBr).pdf PDF version]
* [http://www.crystran.co.uk/caesium-bromide-csbr.htm Crystran Physical data] {{Webarchive|url=https://web.archive.org/web/20121218002818/http://www.crystran.co.uk/caesium-bromide-csbr.htm |date=2012-12-18 }}, [https://web.archive.org/web/20070927230133/http://www.korth.de/transmiss/csbr.htm IR transmission spectrum]
* [http://www.webelements.com/webelements/compounds/text/Cs/Br1Cs1-7787691.html Caesium bromide at webelements.com]
* [http://www3.interscience.wiley.com/cgi-bin/abstract/76509521/ABSTRACT?CRETRY=1&SRETRY=0 Relaxed Excited States Origin and Structure in Lead-Doped Caesium Bromide]
* [http://www.korth.de/transmiss/csbr.htm IR transmission spectrum]
* [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]


{{Caesium compounds}}
{{Caesium compounds}}
{{Bromides}}
{{Authority control}}


[[Category:Bromides]]
[[Category:Caesium compounds]]
[[Category:Caesium compounds]]
[[Category:Alkali metal bromides]]

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[[Category:Caesium chloride crystal structure]]
[[ar:بروميد السيزيوم]]
[[de:Caesiumbromid]]
[[el:Βρωμιούχο καίσιο]]
[[it:Bromuro di cesio]]
[[nl:Cesiumbromide]]
[[ja:臭化セシウム]]
[[ru:Бромид цезия]]
[[zh:溴化銫]]
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