摘要:
                                Lithium bis(diphenylphosphino)amide, (THF)(3)LiN(PPh2)(2) reacts with Ni(COD)(2) or PtMe2(COD) to give the corresponding bimetallic complexes (THF)(3)LiN(PPh2)(2)Ni(COD) and (THF)(3)LiN(PPh2)(2)PtMe2. Reaction of (THF)(3)LiN(PPh2)(2)Ni(COD) with Me3SnCl gave the Ni-Sn derivative, also accessible from Me3SnN(PPh2)(2). The silyl derivatives Me3SiN(PPh2)(2)M [M = Ni(COD), PtMe2] were obtained similarly as red and colourless crystals, respectively. By contrast, the reaction with PdCl2(COD) afforded an insoluble yellow adduct which, on attempted recrystallisation afforded a small amount of a Pd(I) product, [PdCl{HN(PPh2)(2)}](2). The crystal structures of the Ni and Pt complexes are based on MP2N four-membered rings. The geometric parameters proved rather insensitive to changes in the N-main group element bond. In all cases the amido-nitrogen atom deviated slightly from trigonal-planar geometry, most probably as the consequence of packing forces. (c) 2005 Elsevier Ltd. All rights reserved.