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]
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3D model (JSmol)
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| Properties | |
| 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).
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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
edit- ^ 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.