Electronic and Resonance Raman Spectra of a Multibridged Iron Porphyrin |
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Authors: | Koiti Araki Paulo S Santos Henrique E Toma |
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Institution: | Institute de Química, Universidade de S?o Paulo , Caixa Postal 20.780, CEP 01498, S?o Paulo, SP, Brazil |
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Abstract: | Abstract Reported are the electronic and resonance Raman (rR) spectra of a multibridged iron porphyrin derived from meso-tetra(4-pyridil)porphynate iron(II) by complexing the pyridine residues with RuII(edta)]2- ions. The polymetallated system exhibits the characteristic Soret band at 428 nm (log ε = 5.2) and a shoulder around 465 nm (4.6). The rR enhancement of the porphyrin vibrational modes is similar to those previously reported for typical porphyrins; however, an additional feature appears around 465 nm, associated with the selective enhancement of some pyridine vibrational modes. Based on the rR excitation profiles the absorption band at 465 nm was assigned to a RuII-to-pyridine dπ→Pπ? charge-transfer transition. |
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Keywords: | Resonance Raman spectra iron porphyrin multibridged porphyrin |
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