Tungsten oxytetrafluoride

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Tungsten(VI) oxytetrafluoride
WOF4 structure.svg
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/4FH.O.W/h4*1H;;/q;;;;;+4/p-4
    Key: UZQPVNLRTKDHNK-UHFFFAOYSA-J
  • O=[W](F)(F)(F)F
Properties
WOF4
Molar mass 275.83 g/mol
Appearancecolourless crystals [1]
Density 5.07 g/cm3 [2]
Melting point 110 [2]  °C (230 °F; 383 K)
Boiling point 185 [2]  °C (365 °F; 458 K)
reacts [2]
Solubility soluble in chloroform [3]
sparingly soluble in carbon disulfide [3]
Structure
monoclinic
Related compounds
Other anions
Tungsten(VI) oxytetrachloride
Tungsten(VI) oxytetrabromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tungsten oxytetrafluoride is an inorganic compound with the formula WOF4. It is a colorless diamagnetic solid. The compound is one of many oxides of tungsten. It is usually encountered as product of the partial hydrolysis of tungsten hexafluoride.

Contents

Structure

As confirmed by X-ray crystallography, WOF4 crystallizes as a tetramer. The oxides are terminal, and four of the fluorides are bridging. [4] Its structure is similar to those for niobium pentafluoride and tantalum pentafluoride. In contrast, molybdenum oxytetrafluoride adopts a polymeric structure, although again the fluorides bridge and the oxides are terminal. [5]

In the gas state, this molecule is a monomer. [6] It can form complexes with acetonitrile and other compounds. [7] [8]

Preparation

Tungsten(VI) oxytetrafluoride can be synthesized by the reaction of fluorine and tungsten trioxide. [4]

It can also be obtained by treating tungsten with a mixture of oxygen and fluorine at high temperatures. [1] Partial hydrolysis of tungsten hexafluoride will also produce WOF4. [9]

WF6 + H2O → WOF4 + 2 HF

The reaction of tungsten(VI) oxytetrachloride and hydrogen fluoride will also produce WOF4. [3]

WOCl4 + 4HF → WOF4 + 4HCl

WOF4 can also prepared by the reaction of lead(II) fluoride and tungsten trioxide at 700 °C. [3]

2PbF2 + WO3 → WOF4 + 2PbO

Tungsten(VI) oxytetrafluoride hydrolyzes into tungstic acid. [1] [9]

WOF4 + 2 H2O → WO3 + 4 HF

Related Research Articles

<span class="mw-page-title-main">Tungsten hexafluoride</span> Chemical compound

Tungsten(VI) fluoride, also known as tungsten hexafluoride, is an inorganic compound with the formula WF6. It is a toxic, corrosive, colorless gas, with a density of about 13 kg/m3 (22 lb/cu yd). It is the only known gaseous transition metal compound and the densest known gas under standard ambient temperature and pressure. WF6 is commonly used by the semiconductor industry to form tungsten films, through the process of chemical vapor deposition. This layer is used in a low-resistivity metallic "interconnect". It is one of seventeen known binary hexafluorides.

Iodine pentafluoride is an interhalogen compound with chemical formula IF5. It is one of the fluorides of iodine. It is a colorless liquid, although impure samples appear yellow. It is used as a fluorination reagent and even a solvent in specialized syntheses.

<span class="mw-page-title-main">Xenon hexafluoride</span> Chemical compound

Xenon hexafluoride is a noble gas compound with the formula XeF6. It is one of the three binary fluorides of xenon that have been studied experimentally, the other two being XeF2 and XeF4. All known are exergonic and stable at normal temperatures. XeF6 is the strongest fluorinating agent of the series. It is a colorless solid that readily sublimes into intensely yellow vapors.

<span class="mw-page-title-main">Uranium tetrafluoride</span> Chemical compound

Uranium tetrafluoride is the inorganic compound with the formula UF4. It is a green solid with an insignificant vapor pressure and low solubility in water. Uranium in its tetravalent (uranous) state is important in various technological processes. In the uranium refining industry it is known as green salt.

<span class="mw-page-title-main">Xenon trioxide</span> Chemical compound

Xenon trioxide is an unstable compound of xenon in its +6 oxidation state. It is a very powerful oxidizing agent, and liberates oxygen from water slowly, accelerated by exposure to sunlight. It is dangerously explosive upon contact with organic materials. When it detonates, it releases xenon and oxygen gas.

<span class="mw-page-title-main">Selenium tetrafluoride</span> Chemical compound

Selenium tetrafluoride (SeF4) is an inorganic compound. It is a colourless liquid that reacts readily with water. It can be used as a fluorinating reagent in organic syntheses (fluorination of alcohols, carboxylic acids or carbonyl compounds) and has advantages over sulfur tetrafluoride in that milder conditions can be employed and it is a liquid rather than a gas.

<span class="mw-page-title-main">Xenon oxytetrafluoride</span> Chemical compound

Xenon oxytetrafluoride is an inorganic chemical compound. It is an unstable colorless liquid with a melting point of −46.2 °C that can be synthesized by partial hydrolysis of XeF
6, or the reaction of XeF
6 with silica or NaNO
3:

Arsenic pentafluoride is a chemical compound of arsenic and fluorine. It is a toxic, colorless gas. The oxidation state of arsenic is +5.

A hexafluoride is a chemical compound with the general formula QXnF6, QXnF6m−, or QXnF6m+. Many molecules fit this formula. An important hexafluoride is hexafluorosilicic acid (H2SiF6), which is a byproduct of the mining of phosphate rock. In the nuclear industry, uranium hexafluoride (UF6) is an important intermediate in the purification of this element.

<span class="mw-page-title-main">Molybdenum hexafluoride</span> Chemical compound

Molybdenum hexafluoride, also molybdenum(VI) fluoride, is the inorganic compound with the formula MoF6. It is the highest fluoride of molybdenum. It is a colourless solid and melts just below room temperature and boils in 34 °C. It is one of the seventeen known binary hexafluorides.

<span class="mw-page-title-main">Thionyl tetrafluoride</span> Chemical compound

Thionyl tetrafluoride, also known as sulfur tetrafluoride oxide, is an inorganic compound with the formula SOF4. It is a colorless gas.

<span class="mw-page-title-main">Chromyl fluoride</span> Chemical compound

Chromyl fluoride is an inorganic compound with the formula CrO2F2. It is a violet-red colored crystalline solid that melts to an orange-red liquid.

<span class="mw-page-title-main">Vanadium pentafluoride</span> Chemical compound

Vanadium(V) fluoride is the inorganic compound with the chemical formula VF5. It is a colorless volatile liquid that freezes near room temperature. It is a highly reactive compound, as indicated by its ability to fluorinate organic substances.

Chromium pentafluoride is the inorganic compound with the chemical formula CrF5. It is a red volatile solid that melts at 34 °C. It is the highest known chromium fluoride, since the hypothetical chromium hexafluoride has not yet been synthesized.

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.

Fluorine forms a great variety of chemical compounds, within which it always adopts an oxidation state of −1. With other atoms, fluorine forms either polar covalent bonds or ionic bonds. Most frequently, covalent bonds involving fluorine atoms are single bonds, although at least two examples of a higher order bond exist. Fluoride may act as a bridging ligand between two metals in some complex molecules. Molecules containing fluorine may also exhibit hydrogen bonding. Fluorine's chemistry includes inorganic compounds formed with hydrogen, metals, nonmetals, and even noble gases; as well as a diverse set of organic compounds. For many elements the highest known oxidation state can be achieved in a fluoride. For some elements this is achieved exclusively in a fluoride, for others exclusively in an oxide; and for still others the highest oxidation states of oxides and fluorides are always equal.

<span class="mw-page-title-main">Molybdenum(V) fluoride</span> Chemical compound

Molybdenum(V) fluoride is an inorganic compound with the formula MoF5. It is a hygroscopic yellow solid. Like most pentafluorides, it exists as a tetramer.

<span class="mw-page-title-main">Iodyl fluoride</span> Chemical compound

Iodyl fluoride is an inorganic compound of iodine, fluorine, and oxygen with the chemical formula IO2F. The compound was initially synthesized in 1951.

<span class="mw-page-title-main">Molybdenum oxytetrafluoride</span> Chemical compound

Molybdenum oxytetrafluoride is the inorganic compound with the formula MoOF4. It is a white, diamagnetic solid. According to X-ray crystallography, it is a coordination polymer consisting of a linear chain of alternating Mo and F atoms. Each Mo center is octahedral, the coordination sphere being defined by oxide, three terminal fluorides, and two bridging fluorides. In contrast to this motif, tungsten oxytetrafluoride crystallizes as a tetramer, again with bridging fluoride ligands.

<span class="mw-page-title-main">Molybdenum difluoride dioxide</span> Chemical compound

Molybdenum difluoride dioxide is the inorganic compound with the formula MoF2O2. It is a white, diamagnetic, volatile solid.

References

  1. 1 2 3 Perry, Dale L.; Phillips, Sidney L. (1995). Handbook of inorganic compounds. Boca Raton: CRC Press. p. 428. ISBN   0-8493-8671-3. OCLC   32347397.
  2. 1 2 3 4 Haynes, William M.; Lide, David R.; Bruno, Thomas J. (2017). CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. Boca Raton, Florida. p. 104. ISBN   978-1-4987-5429-3. OCLC   957751024.{{cite book}}: CS1 maint: location missing publisher (link)
  3. 1 2 3 4 Lassner, Erik; Schubert, Wolf-Dieter (1999). Tungsten : Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds. Boston, MA. p. 168. ISBN   1-4615-4907-8. OCLC   1113605323.{{cite book}}: CS1 maint: location missing publisher (link)
  4. 1 2 Turnbull, Douglas; Chaudhary, Praveen; Leenstra, Dakota; Hazendonk, Paul; Wetmore, Stacey D.; Gerken, Michael (2020). "Reactions of Molybdenum and Tungsten Oxide Tetrafluoride with Sulfur(IV) Lewis Bases: Structure and Bonding in [WOF4]4, MOF4(OSO), and [SF3][M2O2F9] (M = Mo, W)". Inorganic Chemistry. 59 (23): 17544–17554. doi:10.1021/acs.inorgchem.0c02783. PMID   33200611. S2CID   226989898.
  5. ↑ Edwards, A. J.; Steventon, B. R. (1968). "Fluoride crystal structures. Part II. Molybdenum oxide tetrafluoride". Journal of the Chemical Society A: Inorganic, Physical, Theoretical: 2503. doi:10.1039/j19680002503.
  6. ↑ Johnson, B. F. G. (1976). Inorganic chemistry of the transition elements. Volume 4, A review of the literature published between October 1973 and September 1974. London: Chemical Society. p. 138. ISBN   978-1-84755-645-5. OCLC   820579758.
  7. ↑ Levason, William; Reid, Gillian; Zhang, Wenjian (2016). "Coordination complexes of the tungsten(VI) oxide fluorides WOF4 and WO2F2 with neutral oxygen- and nitrogen-donor ligands". Journal of Fluorine Chemistry. 184. Elsevier BV: 50–57. doi: 10.1016/j.jfluchem.2016.02.003 . ISSN   0022-1139.
  8. ↑ Arnaudet, Lucile; Bougon, Roland; Charpin, Pierrette; Isabey, Jacques; Lance, Monique; Nierlich, Martine; Vigner, Julien (1989). "Preparation, characterization, and crystal structure of the adducts WOF4.nC5H5N (n = 1, 2)". Inorganic Chemistry. 28 (2). American Chemical Society (ACS): 257–262. doi:10.1021/ic00301a020. ISSN   0020-1669.
  9. 1 2 Mendicino, L.; Electrochemical Society. Dielectric Science and Technology Division; Electrochemical Society. Meeting; Symposium on Environmental Issues with Materials and Processes in the Electronics and Semiconductor Industries (2001). Environmental issues with materials and processes for the electronics and semiconductor industries : proceedings of the fourth international symposium. Pennington, NJ: Electrochemical Society. p. 180. ISBN   1-56677-312-1. OCLC   48710248.
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