Potassium Dithioferrate III

Potassium dithioferrate(III) can be prepared by direct combination of iron, sulfur, and potassium carbonate at a temperature above that of the melting point of the carbonate.1 This compound is also made by the heating of potassium thiocyanate and iron(III) oxide at a temperature above 400°, with iron(II) sulfide as a side product.2 The former process has the advantage of separating the insoluble product from a soluble side product. 

Eight grams of iron powder, 45 g. of flowers of sulfur, 40 g. of potassium carbonate, and 8 g. of anhydrous sodium carbonate are very thoroughly mixed and put into a covered clay crucible. This mixture is then heated for a period of 1 to 1-J hours at 900°, at which temperature the reaction mixture is molten. On the completion of the reaction the crucible is allowed to come to room temperature and is then submerged in a beaker of water and the reacted mixture digested on a water bath. The supernatant liquid becomes dark green [the iron complex NasFeS(OH)3]3 it is then 

Bhatjer Handbuch der praparativen anorganischen Chemie, p. 1126, Perd. Enke Verlag, Stuttgart, 1954. 

Grtjbitsch Anorganisch-praparativen Chemie, p. 391, Sprmger-Verlag, Berlin, 1950. 

Wells Structural Inorganic Chemistry, p. 406, Oxford University Press, New York, 1950. 

---

Potassium trithiodiferrate(II), K2Fe2S3, formation of, from potassium dithioferrate(III), 6 171... 

Sodium trihydroxothioferrate(II), Na3FeS(OH)s, formation of, in preparation of potassium dithioferrate(III), 6 170 Sodium trimetaphosphimates, 6 80 Na3(P02NH)3, 1-hydrate, 6 99 4-hydrate, purification and acid hydrolysis of, for preparation of pentasodium diimidotri-phosphate, 6 105 Na3(P02NH)3-NaOH-7H20, 6 80 Sodium triphosphate (tripolyphosphate), 3 101 6-hydrate, 3 103... 

---