View source for Chemistry:Tungsten trisulfide

{{Chembox
|OtherNames = Tungsten(VI) sulphide, tris(sulfanylidene)tungsten
|Section1={{Chembox Identifiers
|CASNo = 12125-19-8
|ChemSpiderID = 9215149
|EINECS = 235-734-2
|PubChem = 11039977
|StdInChI = 1S/3S.W
|StdInChIKey = YMZATHYBBBKECM-UHFFFAOYSA-N
|SMILES = S=[W](=S)=S
}}
|Section2={{Chembox Properties
|Formula =  WS<sub>3</sub>
|MolarMass = 280.038 g/mol
|Appearance = Brown solid
}}
|Section3={{Chembox Related
|OtherCompounds = [[Chemistry:Tungsten disulfide|Tungsten disulfide]]
}}
}}

'''Tungsten trisulfide''' is an [[Chemistry:Inorganic compound|inorganic compound]] of [[Chemistry:Tungsten|tungsten]] and [[Chemistry:Sulfur|sulfur]] with the chemical formula WS<sub>3</sub>.<ref>{{cite journal |last1=Scott |first1=Robert A. |last2=Jacobson |first2=Allan J. |last3=Chianelli |first3=Russ R. |last4=Pan |first4=W. H. |last5=Stiefel |first5=Edward I. |last6=Hodgson |first6=Keith O. |last7=Cramer |first7=Stephen P. |title=Reactions of molybdenum trisulfide, tungsten trisulfide, tungsten triselenide, and niobium triselenide with lithium. Metal cluster rearrangement revealed by EXAFS |journal=Inorganic Chemistry |date=1 April 1986 |volume=25 |issue=9 |pages=1461–1466 |doi=10.1021/ic00229a032 |url=https://pubs.acs.org/doi/abs/10.1021/ic00229a032 |access-date=1 November 2021 |issn=0020-1669}}</ref><ref>{{cite book |last1=Hille |first1=Russ |last2=Schulzke |first2=Carola |last3=Kirk |first3=Martin L. |title=Molybdenum and Tungsten Enzymes: Bioinorganic Chemistry |date=29 September 2016 |publisher=[[Organization:Royal Society of Chemistry|Royal Society of Chemistry]] |isbn=978-1-78262-877-4 |page=155 |url=https://books.google.com/books?id=FRU0DQAAQBAJ&dq=Tungsten+trisulfide&pg=PA155 |access-date=1 November 2021 |language=en}}</ref> The compound looks like chocolate-brown powder.<ref name="KO"/><ref>{{cite web |title=Tungsten trisulfide |url=https://webbook.nist.gov/cgi/formula?ID=B8025276 |publisher=[[Organization:National Institute of Standards and Technology|National Institute of Standards and Technology]]|access-date=1 November 2021 |language=en}}</ref>

==Synthesis==
# Bubbling [[Chemistry:Hydrogen sulfide|hydrogen sulfide]] through hot acidified solution of tungstenates.<ref name=SovietMetallurgy><!--NASA TT F-359 TT 65-50137-->{{cite book|first1=A.&nbsp;N.|last1=Zelikman|first2=O.&nbsp;E.|last2=Krein|first3=G.&nbsp;V.|last3=Samsonov|trans-title=Metallurgy of Rare Metals|title=Metallurgiya redkikh metallov|edition=2nd|editor-first=L.&nbsp;V.|editor-last=Belyaevskaya|orig-date=1964|publisher=S.&nbsp;Monson / Wiener Bindery|series=Israel Program for Scientific Translations|location=Jerusalem|year=1966|translator-first=A.|translator-last=Aladjem |page=7 |url=https://books.google.com/books?id=zUwjAAAAMAAJ |access-date=1 November 2021 |via=[[Google Books]]}}</ref>
# Reaction of [[Chemistry:Tungsten disulfide|tungsten disulfide]] and elemental sulfur on heating:<ref>{{cite web |title=Tungsten Trisulfide-- Tungsten Trisulfide Professional Manufacturer and Supplier |url=http://www.tungsten-powder.com/tungsten-trisulfide.html |publisher=tungsten-powder.com |access-date=1 November 2021}}</ref> <chem display=block>WS2 + S -> WS3</chem>
# Precipitates upon acidification of thiotungstate solutions:<ref name=SovietMetallurgy /> <chem display=block>(NH4)2WS4 + HCl -> WS3 + 2NH4Cl + H2S</chem> <chem display=block>Na2WS4 + H2SO4 -> WS3 + Na2SO4 + H2S</chem>

==Physical properties==
Slightly soluble in cold water and forms colloidal solution in hot water. 

Soluble in alkali metal carbonates and alkali metal hydroxides.<ref name="KO">{{cite book |title=Kirk-Othmer Concise Encyclopedia of Chemical Technology, 2 Volume Set |date=16 July 2007 |publisher={{wipe|John Wiley & Sons}} |isbn=978-0-470-04748-4 |page=1122 |url=https://books.google.com/books?id=BYQfEAAAQBAJ&dq=Tungsten+trisulfide&pg=RA1-PA1122 |access-date=1 November 2021 |language=en}}</ref>

==Chemical properties==
Tungsten trisulfide can be decomposed by heating into tungsten disulfide and elemental sulfur: <chem display=block>WS3 -> WS2 + S</chem>

Reacts with sulfide solutions: <chem display=block>WS3 + (NH4)2S -> (NH4)2WS4</chem>

Reduced by hydrogen: <chem display=block>WS3 + 3H2 -> W + 3H2S</chem>

==References==
{{Reflist}}

{{Sulfides}}
{{Tungsten compounds}}

[[Category:Tungsten compounds]]
[[Category:Sulfides]]

{{Sourceattribution|Tungsten trisulfide}}