The tetrahydrofuran and 1-methylimidazole adducts of ferryl (FeIVO)‘picket fence’ porphyrin, a model for horse radish peroxidase compound II, exhibit FeIVO vibrations, located at 829 and 807 cm–1 as shown by resonance Raman spectroscopy.
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Schappacher et al. (1986) studied this question.