Hexakaliumhexaselenodistannat(III) K₆Sn₂Se₆ – Synthese, Struktur und Eigenschaften einer neuen salzartigen Sn^III-Verbindung

Hexapotassium Hexaselenodistannate(III) K₆Sn₂Se₆ – Synthesis, Structure, and Properties of a New Salt-like Sn^III Compound

Reaction of stoichiometric amounts of potassium, tin, and selenium in sealed silica tubes yield at 900 °C K₆Sn₂Se₆ (1) as red-orange solid of which small particles are very suitable for X-ray structural analysis. Space group P2₁/c, lattice dimensions at 203 K: a = 905.6(2), b = 1277.4(3), c = 888.7(2) pm, β = 115.86(3)°, R₁ = 0.0332. Besides Cs₆Sn₂Se₆, 1 represents the second hexaselenostannate(III) to be known and structurally characterized. Thus, it contributes to the completion of the hexachalcogenostannate(III) family. Additionally, 1 is isostructural and in some cases even isotypic to homologue compounds of the elements silicon and germanium.