Tungsten disulfide

Tungsten disulfide is an inorganic chemical compound composed of tungsten and sulfur with the chemical formula WS2. This compound is part of the group of materials called the transition metal dichalcogenides. It occurs naturally as the rare mineral tungstenite. This material is a component of certain catalysts used for hydrodesulfurization and hydrodenitrification.

"Tungsten sulfide" redirects here. Not to be confused with Tungsten trisulfide.
Tungsten disulfide

Left: WS2 film on sapphire. Right: dark exfoliated WS2 film floating on water
Names
IUPAC names
Tungsten sulfur
Bis(sulfanylidene)tungsten
Systematic IUPAC name
Dithioxotungsten
Other names
Tungsten(IV) sulfide
Tungstenite
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.032.027
EC Number
  • 235-243-3
  • InChI=1S/2S.W Y
    Key: ITRNXVSDJBHYNJ-UHFFFAOYSA-N Y
  • InChI=1S/2S.W
    Key: ITRNXVSDJBHYNJ-UHFFFAOYSA-N
  • S=[W]=S
Properties
WS2
Molar mass 247.98 g/mol
Appearance Blue-gray powder
Density 7.5 g/cm3, solid
Melting point 1,250 °C (2,280 °F; 1,520 K) decomposes
Slightly soluble
Band gap ~1.35 eV (optical, indirect, bulk)
~2.05 eV (optical, direct, monolayer)
+5850·10−6 cm3/mol
Structure
Molybdenite
Trigonal prismatic (WIV)
Pyramidal (S2−)
Related compounds
Other anions
 Tungsten(IV) oxide
Tungsten diselenide
Tungsten ditelluride
Other cations
 Molybdenum disulfide
Tantalum disulfide
Rhenium disulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

WS2 adopts a layered structure similar, or isotypic with MoS2, instead with W atoms situated in trigonal prismatic coordination sphere (in place of Mo atoms). Owing to this layered structure, WS2 forms non-carbon nanotubes, which were discovered after heating a thin sample of WS2 in 1992.

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