Spectroscopic characterization of a phenolate bound FeII–O2 adduct: gauging the relative “push” effect of a phenolate axial ligand

Abstract

Dioxygen adducts of solvent, imidazole and phenolate bound iron porphyrin complexes are reported. The data show that the Fe–O vibration of the Fe–O₂ species shifts from 584 cm⁻¹ to 570 cm⁻¹ as neutral axial ligands are replaced by the anionic phenolate ligand.