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The crystal structures of two silylated phosphanimines have been determined. Me 3 SiNPPh 3 : Space group P 1̃, Z = 2, structure refinement with 2907 observed unique reflections with F o  &gt; 5 σ(F o ), R = 0.052. Lattice dimensions at 19 °C: a = 876.6(1), b = 1125.8(1), c = 1151.2(1) pm, α = 61.71(1)°, β = 88.08(1)°, γ = 87.18(1)°. The compound forms monomeric molecules with a SiNP bond angle of 140.2° and bond lengths PN of 154.2 pm and SiN of 168.6 pm which correspond with PN double and SiN single bonds. Me 3 SiNPPh 2  - C 2 H 4  -PPh 2 N SiMe 3 : Space group P3 1,  Z = 3, structure refinement with 4251 independent reflections, R = 0.061 for 3587 reflections with I &gt; 2σ(I). Lattice dimensions at - 80 °C: a = b = 1591.4(1), c = 1165.8(1) pm. The compound forms monomeric molecules with a c/s-conformation of the PNSiMe 3  groups. Bond angles and bond lengths (average) are SiNP = 140.8°, PN = 153.8 pm, SiN = 165.6 pm.

zeitschrift für naturforschung b

Die Kristallstrukturen der silylierten Phosphanimine Me 3 SiNPPh 3  und Me 3 SiNPPh 2  - C 2 H 4  - PPh 2 NSiMe 3  / Crystal Structures of the Silylated Phosphanimines Me 3 SiNPPh 3  und Me 3 SiNPPh 2  - C 2 H 4  - PPh 2 NSiMe 3