Coordination of a Diphosphine鈥揔etone Ligand to Ni(0), Ni(I), and Ni(II): Reduction-Induced Coordination
文摘
The coordination chemistry of the diphosphine鈥搆etone ligand 2,2鈥?bis(diphenylphosphino)benzophenone (Phdpbp) with nickel is reported. The ketone moiety does not bind to Ni(II) in the complex (Phdpbp)NiCl2, whereas reduction to Ni(I) or Ni(0) induces 畏2(C,O) coordination of the ketone to form the pseudotetrahedral complexes (Phdpbp)NiCl and (Phdpbp)Ni(PPh3). DFT calculations indicate that the metal鈥搆etone bond is dominated by 蟺 back-donation; hence, Phdpbp functions as a hemilabile acceptor ligand in this series of complexes.