Tungsten(IV) iodide

Tungsten(IV) iodide
Names
IUPAC name
Tungsten(IV) iodide
Other names
Tungsten tetraiodide
Identifiers
3D model (JSmol)
  • InChI=1S/4HI.W/h4*1H;/q;;;;+4/p-4
    Key: MMCXETIAXNXKPE-UHFFFAOYSA-J
  • I[W](I)(I)I
Properties
I4W
Molar mass 691.46 g·mol−1
Appearance black crystals
insoluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tungsten(IV) iodide is a binary inorganic compound of tungsten metal and iodine with the chemical formula WI4.[1][2][3]

Preparation

Reaction of tungsten(VI) chloride with hydrochloric acid:[4]

WCl6 + 6HI → WI4 + 6HCl + I2

Reaction of tungsten(IV) chloride with hydrochloric acid:

WCl4 + 4HI → WI4 + 4HCl

Physical properties

Tungsten(IV) iodide forms black crystals of the triclinic crystal system.[5] Insoluble in cold water, diethyl ether, and chloroform. It dissolves in ethanol.[6]

Chemical properties

The compound decomposes when heated in vacuum:

WI4 → WI2 + I2

It hydrolyzes in hot water:[7]

WI4 + 2H2O → WO2 + 4HI

Reacts with chlorine and bromine:

WI4 + 2Cl2 → WCl4 + 2I2
WI4 + 2Br2 → WBr4 + 2I2

References

  1. ^ "Tungsten(IV) Iodide". American Elements. Retrieved 19 March 2024.
  2. ^ "WebElements Periodic Table » Tungsten » tungsten tetraiodide". webelements.com. Retrieved 19 March 2024.
  3. ^ Lide, David R. (29 June 2004). CRC Handbook of Chemistry and Physics, 85th Edition. CRC Press. p. 4-92. ISBN 978-0-8493-0485-9. Retrieved 19 March 2024.
  4. ^ Lassner, Erik; Schubert, Wolf-Dieter (6 December 2012). Tungsten: Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds. Springer Science & Business Media. p. 172. ISBN 978-1-4615-4907-9. Retrieved 19 March 2024.
  5. ^ Yarovoi, S. S.; Smolentsev, A. I.; Ermolaev, A. V.; Mironov, Yu. V. (1 January 2016). "Crystal structure of WI4". Journal of Structural Chemistry. 57 (1): 199–201. doi:10.1134/S002247661601025X. ISSN 1573-8779. Retrieved 19 March 2024.
  6. ^ Occupational Exposure to Tungsten and Cemented Tungsten Carbide. Department of Health, Education, and Welfare, Public Health Service, Center for Disease Control, National Institute for Occupational Safety and Health. 1977. p. 169. Retrieved 19 March 2024.
  7. ^ Mullins, William T.; Leddicotte, G. W. (1961). The Radiochemistry of Tungsten. Subcommittee on Radiochemistry, National Academy of Sciences-National Research Council; available from the Office of Technical Services, Department of Commerce. p. 10. Retrieved 19 March 2024.

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