Abstract
The coordination chemistry of the diphosphine-ketone ligand 2,2′-bis(diphenylphosphino)benzophenone (<sup>Ph</sup>dpbp) with nickel is reported. The ketone moiety does not bind to Ni(II) in the complex (<sup>Ph</sup>dpbp)NiCl<inf>2</inf>, whereas reduction to Ni(I) or Ni(0) induces η<sup>2</sup>(C,O) coordination of the ketone to form the pseudotetrahedral complexes (<sup>Ph</sup>dpbp)NiCl and (<sup>Ph</sup>dpbp)Ni(PPh<inf>3</inf>). DFT calculations indicate that the
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