Difference between revisions of "Caesium bromide"
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| OtherAnions = [[Caesium fluoride]]<br/>[[Caesium chloride]]<br/>[[Caesium iodide]] | | OtherAnions = [[Caesium fluoride]]<br/>[[Caesium chloride]]<br/>[[Caesium iodide]] | ||
| OtherCations = [[Lithium bromide]]<br/>[[Sodium bromide]]<br/>[[Potassium bromide]]<br/>[[Rubidium bromide]] | | OtherCations = [[Lithium bromide]]<br/>[[Sodium bromide]]<br/>[[Potassium bromide]]<br/>[[Rubidium bromide]] | ||
| + | | OtherCpds = [[Caesium bromate]]<br/>[[Caesium perbromate]] | ||
}} | }} | ||
}} | }} | ||
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== 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"/> |
== References == | == References == | ||
Latest revision as of 09:06, 9 January 2011
| 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 | [] |
| EC number | |
| ChemSpider | |
| PubChem | |
| 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.
Contents
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
- ↑ 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.
- ↑ 2.0 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
- 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
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