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.
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:
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.
* 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, Florida: CRC Press. ISBN 1-4398-5511-0.
External links
Wikimedia Commons has media related to Caesium bromide.- MSDS at Oxford University Archived 2007-10-17 at the Wayback Machine
- Crystran Physical data Archived 2012-12-18 at the Wayback Machine, IR transmission spectrum
- Ultra-violet photoabsorption measurements in alkali iodide and caesium bromide evaporated films
References
Schulz, L. G. (1951). "Polymorphism of cesium and thallium halides". Acta Crystallographica. 4 (6): 487–489. Bibcode:1951AcCry...4..487S. doi:10.1107/S0365110X51001641. /wiki/Bibcode_(identifier) ↩