Cobalt “Single-coronet” Porphyrin Bearing Hydroxyl Groups in Its O2 Binding Site as a New Model for Myoglobin and Hemoglobin: Observation of Unusually Low Frequency of ν(O-O) in Resonance Raman Spectrum

The resonance Raman spectrum of oxy CoSCP with AdIm(2-H) showed an unusually low ν(O-O) frequency at 1123 cm-1. This result is due to the cooperative effect of strong donation from AdIm(2-H) and hydrogen bonding between the inner hydroxyl groups and coordinated dioxygen.