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Tungsten(IV) fluoride
Names
IUPAC name
tetrafluorotungsten
Other names
Tungsten(4+) tetrafluoride, Tungsten tetrafluoride
Identifiers
ChemSpider
EC Number
InChI=1S/4FH.W/h4*1H;/q;;;;+4/p-4
Properties
WF4
Molar mass
259.8336128 g/mol
Appearance
Red-Brown or Black Solid
[1]
Related compounds
Tungsten(IV) chloride
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
Chemical compound
Tungsten tetrafluoride is an
inorganic compound with the formula WF4 . This little studied solid has been invoked, together with tungsten pentafluoride, as an intermediate in the
chemical vapor deposition of tungsten films using
tungsten hexafluoride .
[2]
Structure
Tungsten tetrafluoride was found to have polymeric structure based on
Mössbauer spectroscopy .
[3]
Preparation
It has been prepared by treatment of the
coordination complex WCl4 (MeCN)2 with AsF3 .
[4] It has been produced by from the reaction of
WF6 and a W filament at 600-800 °C.
[1]
Reactions
The compound can be re-oxidized to W(VI) compounds by treatment with fluorine and chlorine:
WF4 + X2 → WF4 X2
Upon heating, it
disproportionates to WF6 and tungsten metal.
[1]
References
^
a
b
c Butskii, V. D.; Perov, V. S. (1977). "Synthesis and certain properties of tungsten tetrafluoride". Zhurnal Neorganicheskoi Khimii . 22 (1): 14–17.
^ Creighton, J. R. (1989).
"Selectivity loss during tungsten chemical vapor deposition: The role of tungsten pentafluoride" . Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films . 7 (3): 621–624.
Bibcode :
1989JVSTA...7..621C .
doi :
10.1116/1.575854 .
^ Dzhevitskij, B. Eh; Savvateev, N. N.; Butskij, V. D.; Fal'Kengof, A. T.; Novotortsev, V. M.; Rakitin, Yu V.; Pervov, V. S. (1980).
"Moessbauer spectrum and magnetic properties of tungsten tetrafluoride" . Zhurnal Neorganicheskoj Khimii . 25 (9): 2327–2329.
^ Meinert, Hasso; Dimitrov, A. "On the chemistry of tungsten tetrafluoride" Zeitschrift für Chemie (1976), 16(1), 29-30.
Tungsten(0) Tungsten(II) Tungsten(III) Tungsten(IV) Tungsten(V) Tungsten(VI)
PF6 − , AsF6 − , SbF6 − compounds AlF6 − compounds chlorides, bromides, iodides and pseudohalogenides SiF6 2- , GeF6 2- compounds Oxyfluorides Organofluorides with transition metal, lanthanide, actinide, ammonium nitric acids bifluorides thionyl, phosphoryl, and iodosyl