Potassium dithioferrate

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

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]

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

References

1. Bronger, W.; Kyas, A.; Müller, P. (1987). "The Antiferromagnetic Structures of KFeS₂, RbFeS₂, KFeSe₂, and RbFeSe₂ and the Correlation Between Magnetic Moments and Crystal Field Calculations". Journal of Solid State Chemistry. 70 (2): 262–270. Bibcode:1987JSSCh..70..262B. doi:10.1016/0022-4596(87)90065-X.
2. Mitchell, Roger H.; Ross, Kirk C.; Potter, Eric G. (2004). "Crystal Structures of CsFe₂S₃ and RbFe₂S₃: Synthetic Analogs of Rasvumite KFe₂S₃". Journal of Solid State Chemistry. 177 (6): 1867–1872. Bibcode:2004JSSCh.177.1867M. doi:10.1016/j.jssc.2004.01.007.
3. Deutsch, John L.; Jonassen, Hans B. (1960). "Potassium Dithioferrate(III)". Inorganic Syntheses. Vol. 6. pp. 170–172. doi:10.1002/9780470132371.ch53. ISBN   9780470132371.