Potassium dithioferrate
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| ImageFile = KFeS2.svg
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|Section1={{Chembox Identifiers
| CASNo = 12022-42-3
| ChemSpiderID = 23621924
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| SMILES = S=[Fe-]=S.[K+]
| StdInChI=1S/Fe.K.2S/q-1;+1;;
| StdInChIKey = YILQDQXZSLGNAV-UHFFFAOYSA-N
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|Section2={{Chembox Properties
| K=1|Fe=1|S=2
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| Appearance = dark purple solid
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|Section3={{Chembox Hazards
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Potassium dithioferrate is the inorganic compound with the formula KFeS2. It is a purple solid that is insoluble in water. Regarding its chemical structure, the compound consists of infinite chains of edge-shared anionic FeS4 tetrahedra. Associated with these chains are potassium ions.{{cite journal |doi=10.1016/0022-4596(87)90065-X|title=The Antiferromagnetic Structures of KFeS2, RbFeS2, KFeSe2, and RbFeSe2 and the Correlation Between Magnetic Moments and Crystal Field Calculations|year=1987|last1=Bronger|first1=W.|last2= Kyas|first2=A.|last3=Müller|first3=P.|journal=Journal of Solid State Chemistry|volume=70|issue=2|pages=262–270|bibcode=1987JSSCh..70..262B}} A related family of one-dimensional materials exists with the formula MFe2S3 (M = K, Rb, Cs). These mixed-valence compounds are represented by the mineral rasvumite, KFe2S3.{{cite journal |doi=10.1016/j.jssc.2004.01.007|title=Crystal Structures of CsFe2S3 and RbFe2S3: Synthetic Analogs of Rasvumite KFe2S3|year=2004|last1=Mitchell|first1=Roger H.|last2=Ross|first2=Kirk C.|last3=Potter|first3=Eric G.|journal=Journal of Solid State Chemistry|volume=177|issue=6|pages=1867–1872|bibcode=2004JSSCh.177.1867M}}
The compound is prepared by heating iron powder, sulfur, and potassium carbonate at 900 °C. According to the idealized stoichiometry, this reaction is proposed to cogenerate potassium sulfate:{{cite book |doi=10.1002/9780470132371.ch53|chapter=Potassium Dithioferrate(III)|year=1960|last1=Deutsch|first1=John L.|last2=Jonassen|first2=Hans B.|title=Inorganic Syntheses|volume=6|pages=170–172|isbn=9780470132371}}
:6{{nbsp}}Fe + 13{{nbsp}}S + 4{{nbsp}}K2CO3 → 6{{nbsp}}KFeS2 + K2SO4 + 4{{nbsp}}CO2