Cerium(III) bromide

Cerium(III) bromide

Names
IUPAC names Cerium(III) bromide Cerium tribromide
Other names Cerous bromide
Identifiers
CAS Registry Number	14457-87-5 Y
ChemSpider	76185 Y
InChI InChI=1S/3BrH.Ce/h3*1H;/q;;;+3/p-3 Y Key: MOOUSOJAOQPDEH-UHFFFAOYSA-K Y InChI=1/3BrH.Ce/h3*1H;/q;;;+3/p-3 Key: MOOUSOJAOQPDEH-DFZHHIFOAB
Jmol-3D images	Image
PubChem	292780
SMILES [Ce+3].[Br-].[Br-].[Br-]
UNII	GEM75FEL39 Y
Properties
Chemical formula	CeBr3
Molar mass	379.828 g/mol
Appearance	grey to white solid, hygroscopic
Density	5.1 g/cm3, solid
Melting point	722 °C
Boiling point	1457 °C
Solubility in water	Not Published Yet
Structure
Crystal structure	hexagonal (UCl3 type), hP8
Space group	P63/m, No. 176
Coordination geometry	Tricapped trigonal prismatic (nine-coordinate)
Hazards
EU classification	not listed
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 noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Cerium(III) bromide is an inorganic compound with the formula CeBr₃. This white 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.^[1]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.^[2] Like the related salt CeCl₃, the bromide absorbs water on exposure to moist air. The compound melts congruently at 722 °C, and well ordered single crystals may be produced using standard crystal growth methods like Bridgman or Czochralski.

CeBr₃ adopts the hexagonal, UCl₃-type crystal structure with P6₃/m Space group.^[3]

Applications

CeBr₃-doped lanthanum bromide single crystals are known to exhibit superior scintillation properties for applications in the security, medical imaging, and geophysics detectors.^[4]

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.^[5]

Suppliers

• Sigma-Aldrich

References

1. ↑ Muthman, W.; Stützel, L.; Chem. Ber. , 1899, 32, 3413-3419
2. ↑ Rycerz, L.; Ingier-Stocka,E.; Berkani,M.; Gaune-Escard,M.; J. Chem. Eng. Data 2007, 52, 1209-1212
3. ↑ Morosin, B.; J. Chem. Phys. 49, 1968, 3007
4. ↑ van Loef, E.V.D.; Dorenbos, P.; van Eijk, C.W.E.; Güdel, H.U.; Krämer,K.W.; App. Phys. Lett. 79, 2001, 1573–1575. Mengea, P.; Gautier, G.; Iltis, A.; Rozsa, C.; Solovyeva, V.; Nucl. Inst. Meth. Phys. Res. A 579 2007 6–10
5. ↑ Higgins, W.; Churilov, A.; van Loef, E.; Glodo, J.; Squillante, M.; Shah, K.; J. Crys.Gr. 310 2008 2085–2089.