[W(NPPh3)4]Cl2 — Ein Phosphaniminato-Komplex mit einem Wolfram-Dikation

[W(NPPh₃)₄]Cl₂ — a Phosphoraneiminato Complex with a Dication of Tungsten The title compound has been prepared by the reaction of Me₃SiNPPh₃ with WNCl₃ and WO₂Cl₂, respectively, in acetonitrile, forming colourless crystals, which were characterized by IR spectroscopy and by an X-ray structure determination. Space group P2₁/n, Z = 4, 4 424 observed unique reflections, R = 0.045. Lattice dimensions at 20°C: a = 1 206.5(2), b = 2 225.3(2), c = 2 421.0(3) pm, β = 101.09(1)°. In the dication [W(NPPh₃)₄]²⁺ the tungsten atom is surrounded in a tetrahedral fashion by the four nitrogen atoms of the phosphoraneiminato ligands. The bond lengths WN and PN correspond with double bonds.