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Reversible Dioxygen Binding to Co(II) Complexes with Noninnocent Ligands.

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Area of Science:

  • Inorganic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Metal-ligand cooperativity is crucial for reversible oxygen binding in biological systems.
  • Designing synthetic analogues requires understanding redox-active ligands and their interaction with metal centers.

Purpose of the Study:

  • To synthesize and characterize mononuclear cobalt(II) complexes featuring noninnocent ligands.
  • To investigate the mechanism of reversible O2 binding mediated by metal-ligand cooperativity.
  • To explore the electronic and structural properties of cobalt-oxygen adducts.

Main Methods:

  • Synthesis of mononuclear Co(II) complexes with o-aminothiophenolate and hydrotris(pyrazol-1-yl)borate ligands.
  • Exposure to O2 at room temperature and reduced temperatures to study oxygenation.
  • Spectroscopic and electrochemical characterization of complexes and O2 adducts.
  • Thermodynamic measurements to determine O2 affinity and redox potentials.

Main Results:

  • Novel Co(II) complexes with redox-active ligands were successfully prepared.
  • Metal-ligand cooperativity was observed during reversible O2 binding.
  • Oxidized complexes exhibited significant singlet diradical character.
  • Co/O2 adducts formed via addition of O2 to both cobalt and ligand radical, yielding cobalt(III)-alkylperoxo structures.

Conclusions:

  • Noninnocent ligands are effective in designing cobalt complexes for reversible O2 absorption.
  • The study provides insights into the mechanism of oxygenation driven by metal-ligand cooperativity.
  • These findings contribute to the development of advanced materials for gas storage and catalysis.