Promethium(III) bromide

Promethium(III) bromide

Names
IUPAC name Promethium(III) bromide
Identifiers
CAS Number	14325-78-1  Y
3D model (JSmol)	Interactive image
ChemSpider	132220178  Y
PubChem CID	129681503
InChI InChI=1S/3BrH.Pm/h3*1H;/q;;;+3/p-3 Key: GWRKFHUNEGTAQB-UHFFFAOYSA-K
SMILES [Pm+3].[Br-].[Br-].[Br-]
Properties
Chemical formula	PmBr3
Molar mass	385
Appearance	Red solid [1]
Melting point	624 [1]
Related compounds
Other anions	Promethium(III) fluoride Promethium(III) chloride Promethium(III) iodide
Other cations	Neodymium(III) bromide Samarium(III) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Promethium(III) bromide is an inorganic compound, with the chemical formula of PmBr₃. It is radioactive salt. It is a crystal of the hexagonal crystal system, with the space group of P6₃/mc (No. 176).

Preparation

Promethium(III) bromide can be obtained by reacting hydrogen bromide and promethium(III) oxide: ^[2]

Pm₂O₃ + 6 HBr —^500°C→ 2 PmBr₃ + 3 H₂O

Promethium(III) bromide hydrate cannot be heated to form its anhydrous form. Instead it decomposes in water to form promethium oxybromide: ^[3]

PmBr₃ + H₂O(g) → PmOBr + 2 HBr

References

1. Cotton, Simon (2006). Lanthanide And Actinide Chemistry. John Wiley & Sons. p. 117. ISBN   978-0-470-01006-8.
2. W. R. Wilmarth, G. M. Begun, R. G. Haire, et al. Raman spectra of Pm₂O₃, PmF₃, PmCl₃, PmBr₃ and PmI₃. Journal of Raman Spectroscopy, 2005. 19(4)
3. Wishnevsky, V; Theissig, W; Weigel, F (June 1984). "The vapor phase hydrolysis of lanthanide(III) bromides IV: Heat and free energy of the reaction PmBr₃(s) + H₂O(g) = PmOBr(s) + 2HBr(g)". Journal of the Less Common Metals. 99 (2): 321–329. doi:10.1016/0022-5088(84)90230-3.