Tungsten(IV) iodide

Tungsten(IV) iodide

Names
IUPAC name Tungsten(IV) iodide
Other names Tungsten tetraiodide
Identifiers
CAS Number	14055-84-6  Y
3D model (JSmol)	Interactive image
PubChem CID	14345369
InChI InChI=1S/4HI.W/h4*1H;/q;;;;+4/p-4 Key: MMCXETIAXNXKPE-UHFFFAOYSA-J
SMILES I[W](I)(I)I
Properties
Chemical formula	I4W
Molar mass	691.46 g·mol−1
Appearance	black crystals
Solubility in water	insoluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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.