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Protactinium tetraiodide is a binary inorganic compound of protactinium metal and iodine with the chemical formula PaI₄.

Synthesis

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

3PaI₅ + Al → 3PaI₄ + AlI₃

Also, a reaction of hydrogen reduction of protactinium(V) iodide at 400 °C:

2PaI₅ + H₂ → 2PaI₄ + 2HI

Physical properties

The compound forms black or dark green crystals. The structure is not known.

Chemical properties

The compound is oxidized by antimony trioxide when heated in a vacuum:

3PaI₄ + Sb₂O₃ → 3PaOI₂ + 2SbI₃

The compound also reacts with quartz when heated:

2PaI₄ + SiO₂ → 2PaOI₂ + SiI₄

References

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. Retrieved 2 April 2024.
3. Advances in Inorganic Chemistry and Radiochemistry. Academic Press. 28 February 1970. p. 19. ISBN 978-0-08-057861-3. Retrieved 2 April 2024.
4. ^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3509. ISBN 978-0-412-30120-9. Retrieved 2 April 2024.
5. Emeléus, Harry Julius; Sharpe, A. G. (1959). Advances in Inorganic Chemistry and Radiochemistry. Academic Press. p. 19. Retrieved 2 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 from the original (PDF) on 26 August 2017. Retrieved 3 April 2024.

• Protactinium compounds
• Iodine compounds
• Iodides