Tungsten(V) chloride
Tungsten(V) chloride
Names
Other names
tungsten pentachloride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.235.076
EC Number
  • 807-430-5
  • InChI=1S/5ClH.W/h5*1H;/q;;;;;+5/p-5
    Key: WIDQNNDDTXUPAN-UHFFFAOYSA-I
  • InChI=1S/5ClH.W/h5*1H;/q;;;;;+5/p-5
  • Cl[W](Cl)(Cl)(Cl)Cl
  • Cl1[W](Cl)(Cl)(Cl)(Cl)Cl[W]1(Cl)(Cl)(Cl)Cl
Properties
W2Cl10
Molar mass 361.1 g/mol
Appearance black crystals
hygroscopic
Density 3.86 g/cm3
Melting point 248 °C (478 °F; 521 K)
Boiling point 275.6 °C (528.1 °F; 548.8 K)
+387.0·10−6 cm3/mol
Hazards
GHS labelling:[1]
GHS05: CorrosiveGHS07: Exclamation mark
Danger
H302, H314
Related compounds
Related compounds
 Tungsten(IV) chloride
Tungsten hexachloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Tungsten(V) chloride is an inorganic compound with the formula W2Cl10. This compound is analogous in many ways to the more familiar molybdenum pentachloride.

Synthesis

The material is prepared by reduction of tungsten hexachloride. One method involves the use of tetrachloroethylene as the reductant[2]

2 WCl6 + C2Cl4 → W2Cl10 + C2Cl6

The blue green solid is volatile under vacuum and slightly soluble in nonpolar solvents. The compound is oxophilic and is highly reactive toward Lewis bases.

When the same reduction is conducted in the presence of tetraphenylarsonium chloride, one obtains instead the hexachlorotungstate(V) salt:[3]

2 WCl6 + Cl2C=CCl2 + 2 (C6H5)4AsCl → 2 (C6H5)4As[WCl6] + Cl3C−CCl3

Structure

The compound exists as a dimer, with a pair of octahedral tungsten(V) centres bridged by two chloride ligands. The W---W separation is 3.814 Å, which is non-bonding. The compound is isostructural with Nb2Cl10 and Mo2Cl10. The compound evaporates to give trigonal bipyramidal WCl5 monomers.[4]

References

  1. ↑ "C&L Inventory". echa.europa.eu.
  2. ↑ McCann, III, E. L.; Brown, T. M. (1972). Tungsten(V) Chloride. Inorganic Syntheses. Vol. XIII. pp. 150–154. doi:10.1002/9780470132449.ch29.
  3. ↑ Uhl, G.; Hey, E.; Becker, G.; Weller, F.; Dehnicke, K. (1983). "Über die Reaktion von 2,2-Dimethylpropylidinphosphan mit Wolframhexachlorid; die Kristallstrukturen von [(Cl3PO)WCL4(H9C4CCC4H9)] und [(H5C6)4As][WCL6]". Zeitschrift für anorganische und allgemeine Chemie. 497 (2): 213–223. doi:10.1002/zaac.19834970221.
  4. ↑ Cotton, F. A.; Rice, C. E. (1978). "Tungsten Pentachloride". Acta Crystallogr. B34 (9): 2833–2834. doi:10.1107/S0567740878009322.


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