Resonance Raman Studies of the Electronic State of Oxygen in Hemerythrin

AUTOR(ES)

Dunn, John B. R.

RESUMO

Excitation of oxyhemerythrin with radiation within the envelope of its strong oxygen → iron chargetransfer band generates two Raman frequencies, at 844 cm-1 and 500 cm-1. These are assigned to O-O and Fe-O stretching modes. Confirmation of these assignments is provided by the observed shifts in frequency when 16O2 is substituted by 18O2 as ligand. Comparison of the position of the 844-cm-1 band with band positions of small molecules of known oxidation state clearly establishes that the bound oxygen is in an O22-, peroxide-type, electronic state.

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