A stable bridge: A peroxo‐bridged Fe–O2–Cu complex (see picture) was synthesized and isolated as crystals. The X‐ray structure analysis revealed that the Fe–O2–Cu moiety has a μ‐η2:η1 coordination mode; a peroxo ligand is bound to Fe in a side‐on fashion with only one oxygen atom of the peroxide bound to Cu. The two metal ions (high‐spin FeIII and CuII) were strongly coupled in an antiferromagnetic fashion, thus resulting in a total spin of S=2.

Eine stabile Brücke: Die Fe‐O2‐Cu‐Einheit des hier beschriebenen Fe‐Cu‐Komplexes (siehe Bild) weist einen μ‐η2:η1‐Koordinationsmodus auf: Ein side‐on an das Fe‐Zentrum gebundener Peroxoligand koordiniert nur mit einem Sauerstoffatom an das Cu‐Zentrum. Zwischen beiden Metallzentren (High‐Spin‐FeIII und CuII) herrscht eine starke antiferromagnetische Kopplung; der Gesamtspin beträgt S=2.

A binucleating porphyrin with covalently appended copper chelates having a cross-linked imidazole-phenol group as the novel active site model of cytochrome c oxidase has been prepared, and the dioxygen adduct of its iron(II)-copper(I) complex was spectroscopically characterized.

The title compound, C10H10N2O, was synthesized to investigate the structure of the Tyr–His residue in the active site of cytochrome c oxidase (CcO). The dihedral angle between the cresol and imidazole moieties is 42.21 (4)°, which is similar to that of the tyrosine‐linked histidine in bovine heart CcO. In the title compound, the R and S enantiomers of axial chirality are connected by an O—H⋯N hydrogen bond.

No abstract