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| verifiedrevid = 443321289 |
| verifiedrevid = 443321289 |
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| ImageFile = |
| ImageFile = CsCl polyhedra.png |
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| ImageSize = |
| ImageSize = |
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| ImageFile1 = Caesium-bromide-3D-ionic.png |
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| IUPACName = Cesium bromide |
| IUPACName = Cesium bromide |
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| OtherNames = Cesium bromide,<br/> |
| OtherNames = Cesium bromide,<br/>Caesium(I) bromide |
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|Section1={{Chembox Identifiers |
|Section1={{Chembox Identifiers |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| CASNo_Ref = {{cascite|correct|CAS}} |
| CASNo_Ref = {{cascite|correct|CAS}} |
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| EINECS = 232-130-0 |
| EINECS = 232-130-0 |
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| RTECS = FK9275000 |
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| UNII = 06M25EDM3F |
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| PubChem = 24592 |
| PubChem = 24592 |
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| InChI = 1/BrH.Cs/h1H;/q;+1/p-1 |
| InChI = 1/BrH.Cs/h1H;/q;+1/p-1 |
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|Section2={{Chembox Properties |
|Section2={{Chembox Properties |
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| Formula = CsBr |
| Formula = CsBr |
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| MolarMass = 212. |
| MolarMass = 212.809 g/mol<ref name=r1>Haynes, p. 4.57</ref> |
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| Appearance = White solid |
| Appearance = White solid |
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| Density = 4. |
| Density = 4.43 g/cm<sup>3</sup><ref name=r1/> |
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| MeltingPtC = 636 |
| MeltingPtC = 636 |
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| MeltingPt_ref = <ref name=r1/> |
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| MeltingPt_notes = |
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| BoilingPtC = 1300 |
| BoilingPtC = 1300 |
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| BoilingPt_ref = <ref name=r1/> |
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| BoilingPt_notes = |
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| Solubility = |
| Solubility = 1230 g/L (25 °C)<ref name=r1/> Disputed. |
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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) |
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| 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> |
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| MagSus = -67.2·10<sup>−6</sup> cm<sup>3</sup>/mol<ref>Haynes, p. 4.132</ref> |
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}} |
}} |
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|Section3={{Chembox Structure |
|Section3={{Chembox Structure |
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| CrystalStruct = [[Caesium chloride|CsCl]], [[Pearson symbol|cP2]] |
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| 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> |
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| Coordination = 8–8 |
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| LattConst_a = 0.4291 nm |
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| UnitCellFormulas = 1 |
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| UnitCellVolume =0.0790 nm<sup>3</sup> |
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| Coordination = Cubic (Cs<sup>+</sup>)<br/>Cubic (Br<sup>−</sup>) |
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}} |
}} |
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|Section4={{Chembox Hazards |
|Section4={{Chembox Hazards |
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| NFPA-H = 2 |
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| NFPA-F = 0 |
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| NFPA-R = 0 |
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| GHSSignalWord=Warning |
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| GHSPictograms={{GHS07}} |
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| HPhrases = {{H-phrases|302|315|319|335}} |
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| 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}} |
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| FlashPt = Non-flammable |
| FlashPt = Non-flammable |
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| LD50 = 1400 mg/kg (oral, rat)<ref> |
| LD50 = 1400 mg/kg (oral, rat)<ref>[https://chem.nlm.nih.gov/chemidplus/rn/7787-69-1 Caesium bromide]. nlm.nih.gov</ref> |
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}} |
}} |
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|Section8={{Chembox Related |
|Section8={{Chembox Related |
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| OtherAnions = [[Caesium fluoride]]<br/>[[Caesium chloride]]<br/>[[Caesium iodide]]<br/>[[Caesium astatide]] |
| OtherAnions = [[Caesium fluoride]]<br/>[[Caesium chloride]]<br/>[[Caesium iodide]]<br/>[[Caesium astatide]] |
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| OtherCations = [[Sodium bromide]]<br/>[[Potassium bromide]]<br/>[[Rubidium bromide]] |
| OtherCations = [[Sodium bromide]]<br/>[[Potassium bromide]]<br/>[[Rubidium bromide]]<br/>[[Francium bromide]] |
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}} |
}} |
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}} |
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'''Caesium bromide''' |
'''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 °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> |
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== Synthesis == |
== Synthesis == |
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Caesium bromide can be prepared via following reactions: |
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* [[Neutralization (chemistry)|Neutralization]]: |
* [[Neutralization (chemistry)|Neutralization]]: |
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: CsOH (aq) + HBr (aq) → CsBr (aq) + H<sub>2</sub>O (l) |
: CsOH (aq) + HBr (aq) → CsBr (aq) + H<sub>2</sub>O (l) |
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* Direct synthesis: |
* Direct synthesis: |
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: 2 Cs (s) + Br<sub>2</sub> (g) → 2 CsBr (s) |
: 2 Cs (s) + Br<sub>2</sub> (g) → 2 CsBr (s) |
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The direct synthesis is a vigorous reaction of caesium with |
The direct synthesis is a vigorous reaction of caesium with bromine. Due to its high cost, it is not used for preparation. |
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== Uses == |
== Uses == |
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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]]. |
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== See also == |
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* [[Caesium fluoride]] |
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* [[Caesium iodide]] |
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==References== |
==References== |
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{{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 }} |
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{{Reflist}} |
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==Cited sources== |
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*{{RubberBible92nd}} |
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== External links == |
== External links == |
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{{Commons category|Caesium bromide}} |
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* [http://physchem.ox.ac.uk/MSDS/CA/caesium_bromide.html MSDS at Oxford University] |
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* [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 }} |
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* [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] |
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* [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] |
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* [http://www.webelements.com/webelements/compounds/text/Cs/Br1Cs1-7787691.html Caesium bromide at webelements.com] |
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* [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] |
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* [http://www.korth.de/transmiss/csbr.htm IR transmission spectrum] |
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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] |
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{{Caesium compounds}} |
{{Caesium compounds}} |
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{{Bromides}} |
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{{bots|deny=KasparBot}} |
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{{Authority control}} |
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[[Category:Bromides]] |
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[[Category:Caesium compounds]] |
[[Category:Caesium compounds]] |
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⚫ |
Latest revision as of 20:49, 12 May 2024
Names | |
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IUPAC name
Cesium bromide
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Other names
Cesium bromide,
Caesium(I) bromide | |
Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.029.209 |
EC Number |
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PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
CsBr | |
Molar mass | 212.809 g/mol[1] |
Appearance | White solid |
Density | 4.43 g/cm3[1] |
Melting point | 636 °C (1,177 °F; 909 K)[1] |
Boiling point | 1,300 °C (2,370 °F; 1,570 K)[1] |
1230 g/L (25 °C)[1] Disputed.
420 g/L (11 °C) See References | |
-67.2·10−6 cm3/mol[2] | |
Refractive index (nD)
|
1.8047 (0.3 μm) 1.6974 (0.59 μm) 1.6861 (0.75 μm) 1.6784 (1 μm) 1.6678 (5 μm) 1.6439 (20 μm)[3] |
Structure | |
CsCl, cP2 | |
Pm3m, No. 221[4] | |
a = 0.4291 nm
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Lattice volume (V)
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0.0790 nm3 |
Formula units (Z)
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1 |
Cubic (Cs+) Cubic (Br−) | |
Hazards | |
GHS labelling: | |
Warning | |
H302, H315, H319, H335 | |
P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P312, P321, P330, P332+P313, P337+P313, P362, P403+P233, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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1400 mg/kg (oral, rat)[5] |
Related compounds | |
Other anions
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Caesium fluoride Caesium chloride Caesium iodide Caesium astatide |
Other cations
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Sodium bromide Potassium bromide Rubidium bromide Francium 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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Caesium bromide or cesium bromide is an ionic compound of caesium and bromine with the chemical formula CsBr. It is a white or transparent solid with melting point at 636 °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.[6]
Synthesis
Caesium bromide can be prepared via following reactions:
- 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 bromine. 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.
References
- ^ a b c d e Haynes, p. 4.57
- ^ Haynes, p. 4.132
- ^ Haynes, p. 10.240
- ^ Vallin, J.; Beckman, O.; Salama, K. (1964). "Elastic Constants of CsBr and CsI from 4.2K to Room Temperature". Journal of Applied Physics. 35 (4): 1222. Bibcode:1964JAP....35.1222V. doi:10.1063/1.1713597.
- ^ Caesium bromide. nlm.nih.gov
- ^ Schulz, L. G. (1951). "Polymorphism of cesium and thallium halides". Acta Crystallographica. 4 (6): 487–489. Bibcode:1951AcCry...4..487S. doi:10.1107/S0365110X51001641.
* Crystran Ltd experimental data July 2021 Archived 2012-12-18 at the Wayback Machine
Cited sources
- Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. ISBN 1-4398-5511-0.