Synthese und Kristallstruktur des Kalium‐Iminophosphanids [K4(THF)3(Me3SiNPEt2)2(OSiMe2OSiMe2O)]2

The potassium iminophosphanide complex [K₄(thf)₃(Me₃SiNPEt₂)₂(OSiMe₂OSiMe₂O)]₂ has been obtained by a melt reaction of Me₃SiNPEt₃ with potassium hydride at 140 °C in the presence of silicon grease (—OSiMe₂—)_n and subsequent crystallization from thf solution. The colourless moisture sensitive single crystals are characterized by X‐ray diffraction: Space group P1¯, Z = 1, lattice dimensions at —70 °C: a = 1135.9(3), b = 1250.0(3), c = 1866.1(4) pm, α = 92.65(1)°, β = 100.80(1)°, γ = 93.57(1)°, R₁ = 0.0604. The centrosymmetric dimeric cluster aggregate is formed by two of the eight potassium ions which are connected with the central oxygen atom of both the (OSiMe₂OSiMe₂O)^2— chains as well as with one of their terminal O atoms each. The remaining potassium ions are connected with the phosphorus atoms of the iminophosphanide groups (Me₃SiNPEt₂)^— as well as with its nitrogen atoms. They are terminally solvated by thf molecules.