Names | |
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IUPAC name Cesium bromide | |
Other names
Cesium bromide, Caesium(I) bromide | |
Identifiers | |
CAS Number | |
3D model (JSmol) | |
ChemSpider | |
ECHA InfoCard | 100.029.209 |
EC Number |
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PubChem CID | |
RTECS number |
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Properties | |
Chemical formula | CsBr |
Molar mass | 212.809 g/mol |
Appearance | White solid |
Density | 4.43 g/cm |
Melting point | 636 °C (1,177 °F; 909 K) |
Boiling point | 1,300 °C (2,370 °F; 1,570 K) |
Solubility in water | 1230 g/L (25 °C) Disputed.
420 g/L (11 °C) See References |
Magnetic susceptibility (χ) | -67.2·10 cm/mol |
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) |
Structure | |
Crystal structure | CsCl, cP2 |
Space group | Pm3m, No. 221 |
Lattice constant | a = 0.4291 nm |
Lattice volume (V) | 0.0790 nm |
Formula units (Z) | 1 |
Coordination geometry | Cubic (Cs) Cubic (Br) |
Hazards | |
GHS labelling: | |
Pictograms | |
Signal word | Warning |
Hazard statements | H302, H315, H319, H335 |
Precautionary statements | 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) | 2 0 0 |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) | 1400 mg/kg (oral, rat) |
Related compounds | |
Other anions | Caesium fluoride Caesium chloride Caesium iodide Caesium astatide |
Other cations | Sodium bromide Potassium bromide Rubidium bromide Francium bromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is ?) Infobox references |
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:
- 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
- ^ 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, Florida: CRC Press. ISBN 1-4398-5511-0.
External links
- 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
Caesium compounds | |
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