Cerium(III) bromide

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Cerium(III) bromide
Anhydrous cerium(III) bromide
Names
IUPAC names
Cerium(III) bromide
Cerium tribromide
Other names
Cerous bromide
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.034.936 Edit this at Wikidata
EC Number
  • 238-447-0
UNII
  • InChI=1S/3BrH.Ce/h3*1H;/q;;;+3/p-3 checkY
    Key: MOOUSOJAOQPDEH-UHFFFAOYSA-K checkY
  • InChI=1/3BrH.Ce/h3*1H;/q;;;+3/p-3
    Key: MOOUSOJAOQPDEH-DFZHHIFOAB
  • [Ce+3].[Br-].[Br-].[Br-]
Properties
CeBr3
Molar mass 379.828 g/mol
Appearance grey to white solid,
hygroscopic
Density 5.1 g/cm3, solid
Melting point 722 °C (1,332 °F; 995 K)
Boiling point 1,457 °C (2,655 °F; 1,730 K)
4.56 mol kg−1 (153.8 g/100 g)[1]
Structure
UCl3 type), hP8
P63/m, No. 176
Tricapped trigonal prismatic
(nine-coordinate)
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319, H335
Flash point Non-flammable
Related compounds
Other anions
 Cerium(III) fluoride
Cerium(III) chloride
Cerium(III) iodide
Other cations
 Lanthanum(III) bromide
Praseodymium(III) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Cerium(III) bromide is an

hygroscopic solid is of interest as a component of scintillation counters
.

Preparation and basic properties

The compound has been known since at least 1899, when Muthman and Stützel reported its preparation from cerium sulfide and gaseous HBr.[2] Aqueous solutions of CeBr3 can be prepared from the reaction of Ce2(CO3)3·H2O with HBr. The product, CeBr3·H2O can be dehydrated by heating with NH4Br followed by sublimation of residual NH4Br. CeBr3 can be distilled at reduced pressure (~ 0.1 Pa) in a quartz ampoule at 875-880 °C.[3] Like the related salt

Czochralski
.

CeBr3 adopts the hexagonal, UCl3-type crystal structure with the P63/m space group.[4][5] The cerium ions are 9-coordinate and adopt a tricapped trigonal prismatic geometry.[6] The cerium–bromine bond lengths are 3.11 Å and 3.16 Å.[7]

Applications

CeBr3-doped lanthanum bromide single crystals are known to exhibit superior scintillation properties for applications in the security, medical imaging, and geophysics detectors.[8][9]

Undoped single crystals of CeBr3 have shown promise as a γ-ray scintillation detector in nuclear non-proliferation testing, medical imaging, environmental remediation, and oil exploration.[10]

Suppliers

References

  1. ISSN 0047-2689
    .
  2. ISSN 0365-9496
    .
  3. ISSN 0021-9568
    .
  4. ISSN 0021-9606
    .
  5. ISBN 978-0-19-965763-6
    .
  6. ISBN 978-0-08-037941-8
    .
  7. doi:10.1107/S0365110X48000703
    .
  8. ISSN 0003-6951
    .
  9. ISSN 0168-9002
    .
  10. ISSN 0022-0248
    .
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