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Keywords:

  • copper;
  • cytochromes;
  • dioxygen ligands;
  • heme proteins;
  • Raman spectroscopy
Thumbnail image of graphical abstract

All's well that ends well: The geometric and electronic structure of the first end-on heme–peroxo–copper adduct (see picture) was elucidated using UV/Vis, resonance Raman, and X-ray absorption spectroscopy and is supported by DFT calculations. Coordination of the axial base is correlated to a spin-state change, leading to enhanced biomimetic reactivity, and gives insight into O[BOND]O bond cleavage by cytochrome c oxidase.