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Useful method for the preparation of low-coordinate nickel(I) complexes via transformations of the Ni(I) bis(amido) complex K{Ni[N(SiMe3)(2,6-iPr2-C6H3)]2}

  • Author(s): Lipschutz, MI
  • Tilley, TD
  • et al.

Published Web Location

https://doi.org/10.1021/om500849u
Abstract

© 2014 American Chemical Society. A convenient method of preparing two- and three-coordinate Ni(I) complexes of the form L-NiI-X (L = PtBu3, PiPr3, DPPE, NHC; X = -N(SiMe3)(2,6-iPr-C6H3), -O(2,6-tBu2-4-Me-C6H2)) is reported. Protonation of the easily prepared anionic Ni(I) bis(amido) complex K{Ni[N(SiMe3)(2,6-iPr-C6H3)]2} in the presence of an appropriate L-type ligand results in loss of HN(SiMe3)(2,6-iPr-C6H3) and trapping of the resulting neutral Ni(I)-amido fragment to yield neutral, paramagnetic, two- and three-coordinate Ni(I) complexes. Protonation of these neutral amido complexes by the bulky phenol HO(2,6-tBu2-4-Me-C6H2) results in loss of the second amido moiety and trapping by the resulting phenoxide to yield Ni(I)-O(2,6-tBu2-4-Me-C6H2) complexes. The hapticity of the phenoxide ligand is influenced by the π-accepting ability of the L-type ligand. Where L = PtBu3, a poor π-acceptor, the phenoxide acts as a π-acceptor and adopts a n5-bonding mode through dearomatization of the phenyl ring. When L = NHC, a competent π-acceptor, the phenoxide acts as a π-donor, adopting a n1-bonding mode through the O atom. The modular nature of this synthetic strategy allows variation of both the L- and X-type ligands of the complex in a stepwise fashion and should be extendable to a wide variety of ligand types for new Ni(I) complexes.

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