Komplexe mit dem (NSeMe)2--Liganden. Die Kristallstruktur von [PPh3Me][Cl5W(NSeMe)] / Complexes with the Ligand (NSeMe)2-. The Crystal Structure of [PPh3Me][Cl5W(NSeMe)

Abstract

[CH3CN—WCl4(NSeMe)] and [PPh3Me][Cl5W(NSeMe)] have been prepared by the reaction of Me3SiSeMe with [CH3CN—WCl4(NCl)] and [PPh3Me][WCl5(NCl)], respectively, as brown, moisture sensitive crystals which were characterized by IR spectroscopy. The crystal structure of [PPh3Me][Cl5W(NSeMe)] was determined: Space group PĪ, Z = 4, 7599 observed unique reflexions, R = 0.046. Lattice dimensions at —70°C: α = 1104.6(6), b = 1489.2(9), c = 1650.6(8) pm, α = 108.37(4)°, β = 90.71(4)°, γ = 93.83(4)°. The compound forms ions [PPh3Me]+ and [Cl5W(NSeMe)]-, in which the tungsten atoms is octahedrally coordinated by five chlorine atoms and by the nitrogen atom of the (NSeMe)2- ligand. The bond lengths WN 171.6(8), NSe 180.6(9) pm and bond angles WNSe 173.6(7)°, NSeC 98.3(5)° (in average of the two independent anions) are in agreement with the proposed formula W ≡ N—Se—Me ↔W = N = Se—Me.