Tungsten (VI) oxide tetrachloride

Crystal structure
__ W 6+      __ Cl -      __ O 2−
General
Surname	Tungsten (VI) oxide tetrachloride
other names	Tungsten (VI) chloride oxide Tungsten (VI) oxychloride
Ratio formula	WOCl 4
Brief description	red solid
External identifiers / databases
CAS number 13520-78-0 EC number 236-863-7 ECHA InfoCard 100,033,497 PubChem 4080249 ChemSpider 21171360 Wikidata Q2350865
properties
Molar mass	341.65 g mol −1
Physical state	firmly
density	3.98 g cm −3
Melting point	211 ° C
boiling point	227.5 ° C
solubility	reacts with water soluble in carbon disulfide , benzene , dioxane and acetone
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 315-319-335 P: 261-305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Tungsten (VI) oxide tetrachloride is an inorganic chemical compound of tungsten from the group of oxide chlorides .

Extraction and presentation

Tungsten (VI) oxide tetrachloride can be obtained by reacting tungsten (VI) oxide , tungsten (VI) chloride or sodium tungstate with thionyl chloride .

${\displaystyle \mathrm {WO_{3}+2\ SOCl_{2}\longrightarrow WOCl_{4}+2\ SO_{2}} }$

The representation by heating tungsten (VI) oxide with a solution of chlorine in carbon tetrachloride at 200 ° C or by reacting tungsten powder with sulfuryl chloride at 300 ° C is also possible.

It is also formed during the thermal decomposition of tungsten (VI) dioxide dichloride

${\displaystyle \mathrm {2\ WO_{2}Cl_{2}\longrightarrow WOCl_{4}+WO_{3}} }$

as well as when boiling tungsten (VI) oxide in octachlorocyclopentene

${\displaystyle {\ce {WO3 + C5Cl8 -> WOCl4 + Nebenprodukte}}}$

and when reacting stoichiometric amounts of tungsten (VI) oxide with tungsten (VI) chloride in an evacuated ampoule at 200 ° C:

${\displaystyle {\ce {WO3 + 2 WCl6 -> 3 WOCl4}}}$

properties

Tungsten (VI) oxide tetrachloride is in the form of long, shiny, red needles that appear yellow in transmitted light. It is immediately decomposed by water and more slowly by the humidity, with the formation of tungstic acid. It has a tetragonal crystal structure with the space group I 4 (space group no. 79) and the lattice parameters a = 848 pm and c = 399 pm. In addition to the red tungsten (VI) oxide tetrachloride WOCl ₄ , the yellow tungsten (VI) dioxide dichloride WO ₂ Cl ₂ , the olive green tungsten (V) oxide trichloride WOCl ₃ and the golden brown tungsten (IV) oxide dichloride WOCl _{2 are} further oxide chlorides of the Tungsten.

use

Tungsten (VI) oxide tetrachloride is used in incandescent lamps and as a catalyst in the production of olefins .

Individual evidence

1. ↑ ^{a b c d e} Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1569 .
2. ↑ ^{a b c d} data sheet Tungsten (VI) oxychloride, 98% from Sigma-Aldrich , accessed on July 13, 2013 ( PDF ).
3. ^ Matthias F. Groh, Ulrike Müller, Ejaz Ahmed, Alexander Rothenberger, Michael Ruck: Substitution of Conventional High-temperature Syntheses of Inorganic Compounds by Near-room-temperature Syntheses in Ionic Liquids. In: Zeitschrift für Naturforschung B. 68, 2013, doi: 10.5560 / ZNB.2013-3141 .
4. ↑ ^{a b c d} Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 978-1-4398-1462-8 , pp. 441 ( limited preview in Google Book search).
5. ↑ ^{a b} Susan E. Feil et al .: Tungsten oxide tetrachloride . In: S. Young Tyree, Jr. (Ed.): Inorganic Syntheses . tape 9 . McGraw-Hill Book Company, Inc., 1967, p. 123-126 (English).
6. ↑ ^{a b} J. Tillack: Tungsten oxyhalides - B. Tungsten (VI) tetrachloride oxide . In: Aaron Wold and John K. Ruff (Eds.): Inorganic Syntheses . tape 14 . McGraw-Hill Book Company, Inc., 1973, ISBN   07-071320-0  ( defective ) , p. 109-122 (English).
7. ↑ Balaram Sahoo, Nimain C. Nayak, Asutosh Samantaray, Prafulla K. Pujapanda, Sahoo Balaram, nayak Nimai Charan, samantaray Asutosh, pujapanda Prafulla Kumar: Inorganic Chemistry . 2012, ISBN 978-81-203-4308-5 , pp. 840 ( limited preview in Google Book search).
8. ↑ H. Hess, H. Hartung: The crystal structure of tungsten oxychloride WOCl ₄ and tungsten oxybromide WOBr ₄ . In: Journal of Inorganic and General Chemistry. 344, 1966, pp. 157-166, doi: 10.1002 / zaac.19663440306 .
9. ↑ Royal Society of Chemistry: General and Synthetic Methods . Royal Society of Chemistry, 1982, ISBN 0-85186-864-9 , pp. 9 ( limited preview in Google Book search).