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Structural Characterization of the [CuOR]2+ Core.

V Mahesh Krishnan1, Dimitar Y Shopov1, Caitlin J Bouchey1

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Researchers stabilized highly reactive copper(III) complexes using specific ligands, allowing for detailed characterization. These stable copper(III) complexes exhibited longer lifetimes and slower proton-coupled electron transfer rates.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Coordination Chemistry

Background:

  • Highly reactive copper(III) species are typically transient and difficult to isolate and characterize.
  • Understanding the electronic and structural properties of copper(III) is crucial for catalysis and bioinorganic chemistry.

Purpose of the Study:

  • To stabilize and characterize elusive formal copper(III) complexes.
  • To investigate the influence of ligand design on the stability and reactivity of copper(III) species.
  • To explore the potential for detailed spectroscopic and crystallographic analysis of these reactive intermediates.

Main Methods:

  • Synthesis of formal copper(III) complexes with oxygen-based auxiliary ligands ([CuOR]2+).
  • Modulation of supporting ligand (LY) donor character and auxiliary ligand basicity.
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy and X-ray crystallography.

Main Results:

  • Successful stabilization of typically highly reactive copper(III) cores.
  • First-time characterization of these copper(III) complexes by NMR spectroscopy and X-ray crystallography.
  • Observed enhanced lifetimes in solution and slowed proton-coupled electron transfer (PCET) rates with a phenol substrate.
  • NMR spectra confirmed singlet (S = 0) ground states.
  • X-ray structures revealed shortened Cu-ligand bond distances consistent with theoretical calculations.

Conclusions:

  • Ligand modulation provides a viable strategy for stabilizing reactive copper(III) complexes.
  • The stabilized copper(III) complexes offer a platform for detailed mechanistic studies.
  • These findings advance the understanding of copper redox chemistry and its implications in catalysis.