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Protactinium tetraiodide

From Wikipedia, the free encyclopedia
Protactinium tetraiodide
Identifiers
3D model (JSmol)
  • InChI=1S/4HI.Pa/h4*1H;/q;;;;+4/p-4
    Key: KIEAWOXJKSIKSB-UHFFFAOYSA-J
  • [Pa+4].[I-].[I-].[I-].[I-]
Properties
I4Pa
Molar mass738.65376 g·mol−1
Appearanceblack crystals
Related compounds
Related compounds
uranium tetraiodide,thorium tetraiodide
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Protactinium tetraiodide is a binaryinorganic compound ofprotactinium metal andiodine with the chemical formulaPaI4.[1][2]

Synthesis

[edit]

Protactinium tetraiodide can be prepared by reducing the pentaiodide with aluminum at about 400 °C:[3]

3PaI5 + Al → 3PaI4 + AlI3

Also, a reaction of hydrogen reduction ofprotactinium(V) iodide at 400 °C:[4]

2PaI5 + H2 → 2PaI4 + 2HI

Physical properties

[edit]

The compound forms black or dark green crystals.[4] The structure is not known.[5]

Chemical properties

[edit]

The compound is oxidized byantimony trioxide when heated in a vacuum:[6]

3PaI4 + Sb2O3 → 3PaOI2 + 2SbI3

The compound also reacts withquartz when heated:[dubious –discuss]

2PaI4 + SiO2 → 2PaOI2 + SiI4

References

[edit]
  1. ^"WebElements Periodic Table » Protactinium » protactinium tetraiodide". webelements.com.
  2. ^Brown, David; Canterford, J. H.; Colton, Ray (1968).Halides of the Transition Elements: Halides of the lanthanides and actinides, by D. Brown.Wiley. p. 214.ISBN 978-0-470-10840-6. Retrieved2 April 2024.
  3. ^Advances in Inorganic Chemistry and Radiochemistry.Academic Press. 28 February 1970. p. 19.ISBN 978-0-08-057861-3. Retrieved2 April 2024.
  4. ^abMacintyre, Jane E. (23 July 1992).Dictionary of Inorganic Compounds.CRC Press. p. 3509.ISBN 978-0-412-30120-9. Retrieved2 April 2024.
  5. ^Emeléus, Harry Julius; Sharpe, A. G. (1959).Advances in Inorganic Chemistry and Radiochemistry.Academic Press. p. 19. Retrieved2 April 2024.
  6. ^Morss, Lester R.; Edelstein, Norman M.; Fuger, J. (2010).The Chemistry of the Actinide and Transactinide Elements(PDF). Dordrecht:Springer. p. 874.ISBN 978-94-007-0210-3. Archived fromthe original(PDF) on 26 August 2017. Retrieved3 April 2024.
Pa(II)
Pa(III)
Pa(IV)
Pa(V)
Salts and covalent derivatives of theiodide ion
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