Potassium dithioferrate

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.^[1] 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.^[2]

Potassium dithioferrate

Identifiers
CAS Number	12022-42-3
3D model (JSmol)	Interactive image
ChemSpider	23621924
InChI InChI=1S/Fe.K.2S/q-1;+1;; Key: YILQDQXZSLGNAV-UHFFFAOYSA-N
SMILES S=[Fe-]=S.[K+]
Properties
Chemical formula	FeKS2
Molar mass	159.06 g·mol−1
Appearance	dark purple solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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:^[3]

6 Fe + 13 S + 4 K₂CO₃ → 6 KFeS₂ + K₂SO₄ + 4 CO₂