Polonium tetraiodide

Polonium tetraiodide
Names
	Other names Polonium(IV) iodide
Identifiers
CAS Number	61716-27-6;
3D model (JSmol)	Interactive image;
PubChem CID	101946440;
	InChI InChI=1S/4HI.Po/h4*1H;/p-4 Key: DHKHYWWHNZXEQM-UHFFFAOYSA-J;
	SMILES [I-].[I-].[I-].[I-].[Po];
Properties
Chemical formula	PoI; 4
Molar mass	716.6 g/mol
Appearance	Black crystals
Melting point	200 °C (392 °F; 473 K)
Solubility in water	Insoluble
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

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]

Synthesis

1. Action of iodine vapor on polonium metal:

{\ce {Po + 2I2 -> PoI4}}

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

{\ce {PoO2 + 4HI -> PoI4 + 2H2O}}

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:

{\ce {PoI4 + 2HI -> H2[PoI6]}}

It can be reduced by hydrogen sulfide to yield polonium metal.^[5] It decomposes on heating.

References

^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3510. ISBN 978-0-412-30120-9. Retrieved 2 November 2021.
^ 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.
^ 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.
^ 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.
^ ^a ^b 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)
^ 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)

[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.

[The_polonium_halides-5] 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)

[The_Chemistry_of_Sulphur,_Selenium,_Tellurium_and_Polonium-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)

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