Cesium bromide

Crystal structure
__ Cs +      __ Br -
Crystal system	cubic
Space group	Pm 3 m (No. 221)
Lattice parameters	a = 4.2953  Å
General
Surname	Cesium bromide
Ratio formula	CsBr
External identifiers / databases
CAS number 7787-69-1 EC number 232-130-0 ECHA InfoCard 100.029.209 PubChem 24592 Wikidata Q331002
properties
Molar mass	212.809 g mol −1
Physical state	firmly
density	4.44 g cm −3
Melting point	636  ° C
boiling point	1300 ° C
solubility	1230 g · l −1 in water at 25 ° C, good in ethanol , insoluble in acetone
Refractive index	1.6974
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 315-319-335 P: 261-305 + 351 + 338
Toxicological data	1.4 g kg −1 ( LD 50 ,  rat ,  ip )
Thermodynamic properties
ΔH f 0	−406 kJ / mol
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Cesium bromide is the cesium salt of hydrobromic acid .

presentation

Cesium bromide can be produced from cesium hydroxide or cesium carbonate by a salt formation reaction with hydrobromic acid :

${\displaystyle {\ce {CsOH + HBr -> CsBr + H2O}}}$

${\displaystyle {\ce {2Cs2CO3 + 2HBr -> 2CsBr + CO2 ^ + H2O}}}$

properties

Cesium bromide forms colorless, cubic crystals and is readily soluble in water. It has a red-violet flame color . It is also soluble in lower alcohols . Like cesium chloride and cesium iodide, it crystallizes in the cubic cesium chloride structure in the space group Pm 3 m (space group no. 221) with the lattice parameter a = 4.2953  Å .

use

Windows and prisms for IR and FIR spectroscopy and for scintillation counters are made from cesium bromide crystals .

Individual evidence

1. ↑ ^{a b} data sheet cesium bromide from Sigma-Aldrich , accessed on October 12, 2016 ( PDF ).
2. ^ ^{A b} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1281.
3. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Inorganic Compounds, pp. 4-57.
4. ^ ^{A b c} G. WA Milne: Gardner's Commercially Important Chemicals: Definitions, Trade Names, and ... John Wiley & Sons, 2005, ISBN 978-0-471-73518-2 , pp. 122 ( limited preview in Google Book search).
5. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Index of Refraction of Inorganic Crystals, pp. 10-246.
6. ↑ ^{a b} data sheet cesium bromide from Sigma-Aldrich , accessed on March 15, 2011 ( PDF ).
7. ↑ ^{a b} Korth crystals: Cesium bromide , accessed on October 12, 2010.