SYNTHESIS, CHARACTERIZATION AND REACTIVITY OF BIS(DIPHENYLPHOSPHINO)AMINE NICKEL-COMPLEXES

The binuclear Ni(0) complexes [Ni-2(mu-CO)(CO)(2)(mu-L-2)(2) (3), wher e L-2 is the bridging diphosphine ligand bis(diphenylphosphino)amine ( 1H) or bis(diphenylphosphino)methylamine (1Me), have been prepared by the reaction of [Ni(CO)(4)] and L-2. The bridging CO ligands in comple xes 3 are reversibly displaced by SO2 yielding [Ni-2(mu-SO2) (CO)(2)(m u-L-2)(2)] (4) The single crystal X-ray structure of the binuclear com plex, [Ni-2(mu-SO2)(CO)(2)(mu-(PPh2)(2)NH)(2)] (4H), is presented. [Ni -2(mu-SO2)(CO)(2)(mu-(Ph2P)(2)NH)(2)].(C8H10) crystallizes in the mono clinic space group C-2/c, Z= 4 with lattice parameters a = 27.227(5), b = 9.543(2), c = 22.979(4) Angstrom and beta = 113.26(3)degrees. Reac tion of the complexes 5 with X-2, where X = Cl or I, ultimately gives [NiX2L2] (5), although intermediates in the reactions are observed. P- 31 NMR and mass spectral data for the complexes are reported. Attempts to react the binuclear complexes Cf with several other ligands were u nsuccessful. (C) 1998 Elsevier Science S.A.