Cadmium bromide
Chemical compound
From Wikipedia, the free encyclopedia
Cadmium bromide is the inorganic compound with the formula CdBr2. It is a white hygroscopic solid. It also can be obtained as a mono- and tetrahydrate.[2] It has few applications.
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| Names | |
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| IUPAC name
Cadmium(II) bromide | |
| Other names
Cadmium dibromide | |
| Identifiers | |
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.029.241 |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| CdBr2 | |
| Molar mass | 272.22 g/mol |
| Appearance | white solid |
| Density | 5.192 g/cm3, solid |
| Melting point | 568 °C (1,054 °F; 841 K) |
| Boiling point | 844 °C (1,551 °F; 1,117 K) |
| 56.3 g/100 mL (0 °C) 98.8 g/100 mL (20 °C) 160 g/100 mL (100 °C) | |
| Solubility | soluble in alcohol, ether, acetone and liquid ammonia. |
| −87.3·10−6 cm3/mol | |
| Structure | |
| Rhombohedral, hr9, SpaceGroup = R-3m, No. 166 | |
| Hazards | |
| GHS labelling: | |
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| Warning | |
| H302, H312, H332, H410 | |
| P220, P273, P280, P501 | |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
225 mg/kg, oral (rat) |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
[1910.1027] TWA 0.005 mg/m3 (as Cd)[1] |
REL (Recommended) |
Ca[1] |
IDLH (Immediate danger) |
Ca [9 mg/m3 (as Cd)][1] |
| Related compounds | |
Other anions |
Cadmium chloride, Cadmium iodide |
Other cations |
Zinc bromide, Calcium bromide, Magnesium bromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation and structure
Cadmium bromide is prepared by heating cadmium with bromine vapor.[2] The tetrahydrate has been obtained by crystallization of the dibromide from aqueous solution. At 3.04 g/cm3, it is much less dense than the anhydrous material. According to X-ray crystallography, the tetrahydrate is a polymer of CdBr2(H2O)2 with bridging bromide ligands. There are two interstitial water molecules[3]
