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Keywords:

  • electronic structure;
  • oxidation;
  • oxo ligands;
  • reaction mechanisms;
  • ruthenium
Thumbnail image of graphical abstract

Spin doesn't matter: A ruthenium(II)–aqua complex bearing a pentadentate pyridylamine with a carboxylate group as a ligand affords a seven-coordinate low-spin (S=0) ruthenium(IV)–oxo complex (see structure) by oxidation through proton-coupled electron transfer. Comparison of the reactivity of the low-spin and an intermediate-spin (S=1) RuIV–oxo complexes revealed that the spin state does not affect the reactivity of catalytic oxidation of organic compounds.