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Polonium tetraiodide

From Wikipedia, the free encyclopedia
Polonium tetraiodide
Names
Other names
Polonium(IV) iodide
Identifiers
3D model (JSmol)
  • InChI=1S/4HI.Po/h4*1H;/q;;;;+4/p-4
    Key: DHKHYWWHNZXEQM-UHFFFAOYSA-J
  • I[Po](I)(I)I
Properties
PoI
4[1]
Molar mass716.6 g/mol
AppearanceBlack crystals
Melting point200 °C (392 °F; 473 K)
Insoluble[2]
Related compounds
Related compounds
Chromium(III) sulfide
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Polonium tetraiodide is a binaryinorganic compound ofpolonium andiodine with the chemical formulaPoI
4.[3][4] The compound forms volatile black crystals.[5]

Synthesis

[edit]

1. Action of iodine vapor on polonium metal:

Po + 2 I2 → PoI4

2. Dissolution ofpolonium dioxide inhydroiodic acid:[6]

PoO2 + 4 HI → PoI4 + 2 H2O

Properties

[edit]

Physical properties

[edit]

The compound forms black crystals that are insoluble in water.

Chemical properties

[edit]

The compound reacts withhydroiodic acid to form hexaiodopolonic acid:

PoI4 + 2 HI → H2[PoI6]

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

References

[edit]
  1. ^Macintyre, Jane E. (23 July 1992).Dictionary of Inorganic Compounds.CRC Press. p. 3510.ISBN 978-0-412-30120-9. Retrieved2 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. Retrieved2 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. Retrieved2 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. ^abK. 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)
  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)
Salts and covalent derivatives of theiodide ion
Polonium(−II)
Polonium(II)
Polonium(IV)
Polonium(VI)
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