Nickel(II) and nickel(0) derivatives of bis(diphenylphosphino)amine: [N(PPh2)2]2Ni, (Ph3P)2Ni[(Ph2P)2NH]. Synthesis, characterization, and some properties

Disproportionation of nickel(I) bis(triphenylphosphino)bis(trimethylsilyl)amide, (Ph3P)2NiN(SiMe3)2, in the presence of bis(diphenylphosphino)amine, (Ph2P)2NH, yields Ni(II) and Ni(0) phosphinoamide complexes: [N(Ph2P)2]2Ni (1), (Ph3P)2Ni[(Ph2P)2NH] (2). Ether solution, containing 2 and Ph3P (1:2) reacts with dioxygen (one equivalent) to form triphenylphosphinoxide adduct (Ph3P)2Ni[(Ph2P)2NH⋯OPPh3] (3) in high yield. The crystal structures of compounds 1 and 3 have been determined by X-ray diffraction method.