Abstract: | Synthesis and Crystal Structures of the Silylated λ5-Phosphazenes R? C(CH2PPh2NSiMe3)3 with R = H and CH3 The title compounds are obtained by Staudinger reaction from the corresponding tripodal phosphanes R? C(CH2PPh2)3 and trimethylsilylazide. Both complexes are characterized by their IR and NMR spectra and by crystal structure analyses. H? C(CH2PPh2NSiMe3)3 ( 1 ): Space group P21/c, Z = 4, structure determination with 7833 independent reflections, R = 0.055. Lattice dimensions at ?50°C: a = 1399.5, b = 2311.4, c = 1678.9 pm, β = 112.92°. CH3? C(CH2PPh2NSiMe3)3 ( 2 ): Space group P1 , Z = 2, structure determination with 9251 independent reflections, R = 0.057. Lattice dimensions at ?50°C: a = 1276.5, b = 1386.9, c = 1790.2 pm; α = 85.55°, β = 69.39°, γ = 62.99°. 1 and 2 form monomeric molecules which are distinguished by their conformation. |