Photochemistry of metalloporphyrins in aqueous solutions |
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| Affiliation: | 1. Department of Anesthesiology and Intensive Care, University of Leipzig, Medical Faculty, Leipzig, Germany;2. Institute of Medical Microbiology and Epidemiology of Infectious Diseases, University of Leipzig, Medical Faculty, Leipzig, Germany;3. Leibniz Institute of Surface Engineering (IOM), Leipzig, Germany;4. Institute of Chemistry, Faculty of Natural Sciences, Technical University of Chemnitz, Chemnitz, Germany |
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| Abstract: | The fluorescence spectra of Ga(III), In(III), Ge(IV) and Sn(IV) tetramethyl pyridine porphyrin showed a small stokes shift ca 400 ± 100 cm−1 attributed to the similarity between their ground and excited states. The one and two electron reduction products of the metalloporphyrins were studied by steady-state method. The nature of the product was dependent upon the pH of the reaction medium. Chlorin and phlorin were obtained at low and high pH's, respectively. Sn TMPyP was the only metalloporphyrin which yielded the Π-radical anion whose stability is due to the high electronegativity of Sn(IV). |
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