Phosphaniminate von Alkalimetallen: Die Kristallstrukturen von [KNPCy3]4, [KNPCy3]4·2OPCy3, [CsNPCy3]4·4OPCy3 und [Li4(NPPh3)(OSiMe2NPPh3)3(DME)]

Why are the {Cu4N4} rings in copper(I) phosphinimide clusters [Cu{μ-N = PR3}]4 (R = NMe3 or Ph) planar?

The copper phosphinimide complexes [Cu{μ-N[double bond, length as m-dash]PR3}]4 (1, R = NMe2 and 2, R = Ph) were obtained in good yields from the reactions of Cu[Mes] (Mes = mesityl, C6H2Me3-2,4,6) with the corresponding iminophosphoranes, HNPR3. The molecular structures of 1 and 2 reveal the presence of planar eight-membered {Cu4N4} rings which contrasts with the saddle-shaped {M4N4} rings found in related metal phosphinimide complexes. According to computations, there is negligible aromaticity in the planar {Cu4N4} rings in 1 and 2 and the saddle shape observed in related {M4N4} rings is due to steric factors.

Hydrogen-bonded cubanes and ladder fragments by analogy with the inorganic solid state

By application of an analogy with the structures of alkali-metal phosphinimides, two hydrogen-bonded cubanes, [Ph(3)CNH(3)(+)X(-)](4) (X = Cl, Br), and one unprecedented four-rung ladder fragment, [Ph(3)CNH(3)(+)I(-)](4), have been prepared in the organic solid state.

The syntheses and structures of lithium phosphinimide and phosphinimine complexes

The preparation and structures of [Li(µ-NPt-Bu3)]4 1, [Li(µ-Cl)(HNPt-Bu3)]4 2, and [Li(µ-Cl)(HNPPh3)]4 3 are described. The structure of 1 stands in contrast to that of the only other known Li-phosphinimide derivative, [Li(µ-NPPh3)]6. The impact of the steric bulk on the aggregation and the geometries of the Li4N4 and Li4Cl4 cores are considered and discussed.Key words: lithium compounds, phosphinimine, phosphinimide, P-N ligands.