Tungsten(IV) iodide
| Names | |
|---|---|
| IUPAC name
Tungsten(IV) iodide
| |
| Other names
Tungsten tetraiodide
| |
| Identifiers | |
3D model (
JSmol ) |
|
PubChem CID
|
|
CompTox Dashboard (EPA)
|
|
| |
| |
| 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
- ^ "Tungsten(IV) Iodide". American Elements. Retrieved 19 March 2024.
- ^ "WebElements Periodic Table » Tungsten » tungsten tetraiodide". webelements.com. Retrieved 19 March 2024.
- ISBN 978-0-8493-0485-9. Retrieved 19 March 2024.
- ISBN 978-1-4615-4907-9. Retrieved 19 March 2024.
- ISSN 1573-8779. Retrieved 19 March 2024.
- ^ 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.
- ^ 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.