Tungsten (IV) sulfide

Crystal structure
__ W 4+      __ S 2−
General
Surname	Tungsten (IV) sulfide
Ratio formula	WS 2
Brief description	gray-bluish odorless solid
External identifiers / databases
CAS number 12138-09-9 EC number 235-243-3 ECHA InfoCard 100.032.027 PubChem 82938 Wikidata Q419711
properties
Molar mass	247.97 g mol −1
Physical state	firmly
density	7.5 g cm −3
Melting point	1250 ° C
solubility	practically insoluble in water
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 (IV) sulfide is a chemical compound from the group of tungsten compounds and sulfides .

Occurrence

Tungsten (IV) sulfide occurs naturally in the form of the mineral tungstenite .

Extraction and presentation

Tungsten (IV) sulfide can be obtained directly from the elements

${\displaystyle \mathrm {W+2\ S\longrightarrow WS_{2}} }$

or by reacting tungsten (VI) oxide with sulfur .

${\displaystyle \mathrm {2\ WO_{3}+7\ S\longrightarrow 2\ WS_{2}+3\ SO_{2}} }$

properties

Tungsten (IV) sulfide is a gray-bluish to black odorless solid that is sparingly soluble in water. It has a hexagonal crystal structure with the space group P 6 ₃ / mmc (space group no. 194) (a = 3.132, c = 12.323 Å). A trigonal shape (space group R 3 m (No. 160) , a = 3.158, c = 18.49 Å) is also known. It has catalyst and detector properties .

Individual evidence

1. ↑ ^{a b c d e f g} Entry on tungsten disulfide in the GESTIS substance database of the IFA , accessed on February 10, 2017(JavaScript required) .
2. ↑ Mindat: Tungstenite
3. ↑ ^{a b} Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1574.
4. ↑ Entry of tungstenite in the Handbook of Mineralogy.