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Visible And Resonance Raman Spectra Of Low Valent Iron Porphyrins, Chathra De Silva, Kazimierz Czarnecki, Michael D. Ryan

Chemistry Faculty Research and Publications

The resonance Raman spectrum of Fe(TPP)²⁻ was obtained after the three-electron electrochemical reduction of Fe(TPP)(Cl). The coulometric reduction was carried out in the presence of bis(triphenylphosphoanylidine)ammonium chloride in DMF in order to avoid the formation of iron–σ-alkyl complexes. The resonance Raman spectrum of the intermediate oxidation states (Fe(TPP) and Fe(TPP)⁻) were consistent with previous work. The spectrum of the three-electron product, Fe(TPP)²⁻, obtained at 442 nm, was qualitatively similar to the two-electron reduced product, Fe(TPP)⁻, with an intense ν₂ band at 1537 cm⁻¹. The high frequency bands generally decreased in …