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 with the formula MFe₂S₃ (M = K, Rb, Cs). These mixed-valence compounds are represented by the mineral rasvumite.^[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

^ 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.
^ 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.
^ Deutsch, John L.; Jonassen, Hans B. (1960). "Potassium Dithioferrate(III)". Inorganic Syntheses. Vol. 6. pp. 170–172. doi:10.1002/9780470132371.ch53. ISBN 9780470132371.

[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.

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