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O2 Activation by a Coordinated -NH- Function: Hydrogen Atom Transfer and Aromatic Ring Oxidation.

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Ruthenium(II) and osmium(II) complexes catalyze the oxidation of 1,4-naphthoquinone rings using molecular oxygen. This process involves hydrogen atom transfer and generates novel oxidized species and metal complexes.

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Area of Science:

  • Inorganic Chemistry
  • Organic Chemistry
  • Catalysis

Background:

  • The oxidation of organic molecules is crucial in synthetic chemistry.
  • Metal-catalyzed oxidation reactions offer efficient pathways for functional group transformations.
  • Developing novel oxidation methods using readily available oxidants like molecular oxygen is of significant interest.

Purpose of the Study:

  • To disclose a unique method for the air oxidation of a 1,4-naphthoquinone ring.
  • To investigate the mechanism of oxygen activation and subsequent oxidation of the naphthoquinone ligand coordinated to ruthenium(II) and osmium(II) ions.
  • To synthesize and characterize novel metal complexes involved in the oxidation process.

Main Methods:

  • Coordination of a 1,4-naphthoquinone derivative (H3L) to octahedral ruthenium(II) and osmium(II) ions.
  • Spontaneous activation of molecular oxygen (3O2) by the coordinated metal complex.
  • Isolation and characterization of intermediate and final metal complexes using techniques such as UV-vis spectroscopy and cyclic voltammetry.
  • Kinetic studies using time-driven UV-vis spectroscopy to determine reaction rate constants.

Main Results:

  • A novel oxidation pathway for the 1,4-naphthoquinone ring in the presence of ruthenium(II) and osmium(II) complexes was established.
  • The oxidation proceeds via hydrogen atom transfer (HAT) from the ligand to O2, forming hydroperoxy intermediates and subsequently oxidized products.
  • Novel ruthenium(II) and osmium(II) complexes of the types [MII(H2L-)(PPh3)2X], [MII(HLOOH-)(PPh3)2X], and trans-[MII(LOX-)(PPh3)2X] were successfully isolated.
  • The reaction rate is dependent on the O2 concentration but not on the metal complex concentration.

Conclusions:

  • Ruthenium(II) and osmium(II) complexes can effectively activate molecular oxygen for the oxidation of coordinated 1,4-naphthoquinone ligands.
  • The mechanism involves HAT and formation of hydroperoxy intermediates, leading to the fully oxidized ligand.
  • The study provides insights into metal-ligand cooperative effects in oxidation reactions.