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Exploring Ligand-Centered Hydride and H-Atom Transfer.

Bronte J Charette1, Joseph W Ziller1, Alan F Heyduk1

  • 1Department of Chemistry, University of California, Irvine, Irvine, California 92677-2025, United States.

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|March 18, 2021
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Summary
This summary is machine-generated.

This study explores a nickel complex with a redox-active ligand, investigating its potential as a hydrogen atom and hydride donor. The research details its chemical transformations and thermodynamic properties for H• and H- transfer.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Redox Chemistry

Background:

  • Nickel complexes with redox-active ligands are of interest for catalytic applications.
  • Understanding hydrogen atom (H•) and hydride (H-) transfer mechanisms is crucial in chemistry.

Purpose of the Study:

  • To investigate the hydrogen atom (H•) and hydride (H-) donor capabilities of a protonated nickel(II) complex with a redox-active ligand.
  • To characterize the resulting complexes formed during H• and H- transfer reactions.
  • To determine the thermodynamic parameters governing these transfer processes.

Main Methods:

  • Synthesis and characterization of nickel complexes.
  • Spectroscopic and crystallographic analyses.
  • Thermodynamic measurements including bond dissociation free energy (BDFE) and hydricity (ΔG°H-).

Main Results:

  • The nickel(II) complex [ON(H)O]Ni(PPh3) acts as both a hydrogen atom and hydride donor.
  • Deprotonation yielded a square-planar anion, while H• transfer led to a five-coordinate complex exhibiting ligand exchange and valence tautomerization.
  • Hydride abstraction resulted in an octahedral nickel(II) complex.

Conclusions:

  • The studied nickel complex demonstrates versatile reactivity as an H• and H- donor.
  • The observed ligand exchange and valence tautomerization highlight the dynamic nature of the nickel center and redox-active ligand.
  • BDFE and hydricity measurements provide quantitative insights into the complex's potential for H• and H- transfer reactions.