Actinium bromide

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Actinium bromide
Other names Actinium(III) bromide
Actinium tribromide
Identifiers
InChI InChI=1/Ac.3BrH/h;3*1H/q+3;;;/p-3
InChIKey JLELPRYXOWOYJH-DFZHHIFOAN
Standard InChI InChI=1S/Ac.3BrH/h;3*1H/q+3;;;/p-3
Standard InChIKey JLELPRYXOWOYJH-UHFFFAOYSA-K
CAS number [33689-81-5]
ChemSpider 23620756
Properties[1]
Chemical formula AcBr3
Molar mass 466.74 g mol−1 [note 1]
Appearance white solid
Density 5.85 g cm−3
Boiling point

800 °C subl.

Solubility in water soluble
Structure[5]
Crystal structure Uranium trichloride
Lattice constant a = 806(4) pm, c = 468(2) pm
Related compounds
Other anions Actinium fluoride
Actinium chloride
Actinium iodide
Other cations Scandium bromide
Yttrium bromide
Lanthanum bromide
Other compounds Actinium oxobromide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Actinium bromide, AcBr3, is the only known binary bromide of actinium. It has been prepared (on a 10-µg scale) by the reaction of actinium hydroxide with aluminium bromide at 800 °C.[5][4]

2Ac(OH)3 + 3CCl4 → 2AcCl3 + 3CO2 + 6HCl

It reacts with water vapour at 500 °C to give the oxobromide.[5][4]

Notes and references

Notes

  1. The molar mass is based on actinium-227 (t½ = 21.772(3) a; Ar = 227.027 7521(26)),[2] the most commonly encountered isotope of actinium and the one used in the original chemical studies.[3][4]

References

  1. CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-73. ISBN 0-8493-0462-8.
  2. Audi, G.; Bersillon, O.; Blachot, J.; Wapstra, A. H. The NUBASE evaluation of nuclear and decay properties. Nucl. Phys. A 2003, 729, 3–128. doi:10.1016/j.nuclphysa.2003.11.001, <http://amdc.in2p3.fr/nubase/Nubase2003.pdf>.
  3. Hagemann, French The Isolation of Actinium. J. Am. Chem. Soc. 1950, 72 (2), 768–71. DOI: 10.1021/ja01158a033.
  4. 4.0 4.1 4.2 Fried, Sherman; Hagemann, French; Zachariasen, W. H. The Preparation and Identification of Some Pure Actinium Compounds. J. Am. Chem. Soc. 1950, 72 (2), 771–75. DOI: 10.1021/ja01158a034.
  5. 5.0 5.1 5.2 Kirby, H. W.; Morss, L. R. Actinium. In The Chemistry of the Actinide and Transactinide Elements, 3rd ed.; Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean, Eds.; Springer: Dordrecht, the Netherlands, 2006; Vol. 1, Chapter 2, pp 18–51. doi:10.1007/1-4020-3598-5_2, <http://radchem.nevada.edu/classes/rdch710/files/actinium.pdf>.

External links

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