Caesium bromide
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.
| Names | |
|---|---|
| IUPAC name
Cesium bromide | |
| Other names
Cesium bromide, Caesium(I) bromide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.029.209 |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| CsBr | |
| Molar mass | 212.809 g/mol |
| Appearance | White solid |
| Density | 4.43 g/cm3 |
| Melting point | 636 °C (1,177 °F; 909 K) |
| Boiling point | 1,300 °C (2,370 °F; 1,570 K) |
| 1230 g/L (25 °C) Disputed.
420 g/L (11 °C) See References | |
| -67.2·10−6 cm3/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 | |
| CsCl, cP2 | |
| Pm3m, No. 221 | |
a = 0.4291 nm | |
Lattice volume (V) |
0.0790 nm3 |
Formula units (Z) |
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) |
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 [77 °F], 100 kPa).
Infobox references | |
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