Polonium tetraiodide

Polonium tetraiodide is a binary inorganic compound of polonium and iodine with the chemical formula PoI
4.[3][4] The compound forms volatile black crystals.[5]

Polonium tetraiodide
Names
Other names
Polonium(IV) iodide
Identifiers
3D model (JSmol)
  • InChI=1S/4HI.Po/h4*1H;/p-4
    Key: DHKHYWWHNZXEQM-UHFFFAOYSA-J
  • [I-].[I-].[I-].[I-].[Po]
Properties
PoI
4[1]
Molar mass 716.6 g/mol
Appearance Black crystals
Melting point 200 °C (392 °F; 473 K)
Insoluble[2]
Related compounds
Related compounds
 Chromium(III) sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis

1. Action of iodine vapor on polonium metal:

2. Dissolution of polonium dioxide in hydroiodic acid:[6]

Properties

Physical properties

The compound forms black crystals that are insoluble in water.

Chemical properties

The compound reacts with hydroiodic acid to form hexaiodopolonic acid:

It can be reduced by hydrogen sulfide to yield polonium metal.[7] It decomposes on heating.

References
  1. Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3510. ISBN 978-0-412-30120-9. Retrieved 2 November 2021.
  2. Schweitzer, George K.; Pesterfield, Lester L. (14 January 2010). The Aqueous Chemistry of the Elements. Oxford University Press. p. 134. ISBN 978-0-19-539335-4. Retrieved 2 November 2021.
  3. Brown, Susan A.; Brown, Paul L. (25 September 2019). The Aqueous Chemistry of Polonium and the Practical Application of its Thermochemistry. Elsevier. p. 24. ISBN 978-0-12-819309-9. Retrieved 2 November 2021.
  4. Schmidt, M.; Siebert, W.; Bagnall, K.W. (2013). The Chemistry of Sulphur, Selenium, Tellurium and Polonium: Pergamon Texts in Inorganic Chemistry. Elsevier. pp. 961–962. ISBN 978-1483158655.
  5. Bagnall, K. W.; D'Eye, R. W. M.; Freeman, J. H. (1 January 1956). "657. The polonium halides. Part III. Polonium tetraiodide". Journal of the Chemical Society (Resumed): 3385–3389. doi:10.1039/jr9560003385. Retrieved 2 November 2021.
  6. M. Schmidt, W. Siebert, K. W. Bagnall (2013). The Chemistry of Sulphur, Selenium, Tellurium and Polonium: Pergamon Texts in Inorganic Chemistry. Elsevier. pp. 961–962. ISBN 978-1483158655.{{cite book}}: CS1 maint: multiple names: authors list (link)
  7. K. W. Bagnall, R. W. M. D'Eye, J. H. Freeman (1956). "657. The polonium halides. Part III. Polonium tetraiodide". Journal of the Chemical Society (Resumed). J. Chem. Soc.: 3385–3389. doi:10.1039/JR9560003385.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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