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Tungsten(IV) iodide
Names
IUPAC name
Tungsten(IV) iodide
Other names
Tungsten tetraiodide
Identifiers
InChI=1S/4HI.W/h4*1H;/q;;;;+4/p-4
Key: MMCXETIAXNXKPE-UHFFFAOYSA-J
Properties
I 4 W
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).
Chemical compound
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 + 2H2 O → 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 .
^ 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 .
^ 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 .
^ 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 .
^
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 .
Iodine(-I) Iodine(I) Iodine(II) Iodine(III) Iodine(IV) Iodine(V) Iodine(VII)
Tungsten(0) Tungsten(II) Tungsten(III) Tungsten(IV) Tungsten(V) Tungsten(VI)
Salts and covalent derivatives of the
iodide ion