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Cadmium bromide

Cadmium bromide
Cadmium bromide
Names
IUPAC name
Cadmium(II) bromide
Other names
Cadmium dibromide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.241 Edit this at Wikidata
EC Number
  • 232-165-1
RTECS number
  • EU9935000
UNII
  • InChI=1S/2BrH.Cd/h2*1H;/q;;+2/p-2 checkY
    Key: KPWJBEFBFLRCLH-UHFFFAOYSA-L checkY
  • InChI=1/2BrH.Cd/h2*1H;/q;;+2/p-2
    Key: KPWJBEFBFLRCLH-NUQVWONBAB
  • Br[Cd]Br
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:
GHS07: Exclamation markGHS09: Environmental hazard
Warning
H302, H312, H332, H410
P220, P273, P280, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
0
0
Lethal dose or concentration (LD, LC):
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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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.

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]

References

  1. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0087". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ a b F. Wagenknecht; R. Juza (1963). "Cadmium bromide". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2. NY, NY: Academic Press. p. 1096.
  3. ^ Leligny, H.; Monier, J. C. (1978). "Structure Cristalline de CdBr2.4H2O". Acta Crystallographica Section B. 34 (1): 5–8. Bibcode:1978AcCrB..34....5L. doi:10.1107/S0567740878002186.


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