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Promethium(III) bromide

From Wikipedia, the free encyclopedia
Promethium(III) bromide
Names
IUPAC name
Promethium(III) bromide
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/3BrH.Pm/h3*1H;/q;;;+3/p-3
    Key: GWRKFHUNEGTAQB-UHFFFAOYSA-K
  • [Pm+3].[Br-].[Br-].[Br-]
Properties
PmBr3
Molar mass385
AppearanceRed solid[1]
Melting point624[1]
Related compounds
Otheranions
Promethium(III) fluoride
Promethium(III) chloride
Promethium(III) iodide
Othercations
Neodymium(III) bromide
Samarium(III) bromide
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Promethium(III) bromide is aninorganic compound, with thechemical formula of PmBr3. It is radioactive salt. It is a crystal of thehexagonal crystal system, with thespace group of P63/mc (No. 176).

Preparation

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Promethium(III) bromide can be obtained by reactinghydrogen bromide andpromethium(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

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  1. ^abCotton, 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.
Salts and covalent derivatives of thebromide ion
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