Reactions of Cr(III) tetraphenylporphyrin complex with superoxide ion: ESR evidence for the formation of a new superoxide adduct of Cr(IV) porphyrinate and its reactive character |
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| Institution: | 1. Faculty of Sciences of Monastir, Laboratory of Physical Chemistry of Materials (LR01ES19), University of Monastir, Avenue de l''environnement, Monastir 5019, Tunisia;2. Faculty of Sciences of Monastir, Laboratory of Quantum and Statistical Physics LR18ES18, University of Monastir, Monastir 5019, Tunisia;3. Département de Chimie Moléculaire, Université Grenoble Alpes, 301 rue de la Chimie, CS 40700, Grenoble 38058 CEDEX 9, France;4. Institut de Chimie des Substances Naturelles CNRS, Avenue de la Terrasse, Gif-sur-Yvette F-91198, France;5. Laboratoire de Chimie, Ecole Normale Superieure de Lyon (ENS), 46, Allée d''Italie, Lyon 69364 CEDEX 07, France;1. Chemistry Department, University of Ilorin, Ilorin, P.M.B 1515, Kwara State, Nigeria;2. Chemistry Department, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India;3. Pure and Applied Chemistry Department, Kebbi State University of Science and Technology, Aliero, P.M.B 1144, Kebbi State, Nigeria;4. Department of Physics, University of Jammu, Jammu Tawi, 180006, India;5. Industrial Chemistry Department, University of Ilorin, Ilorin, P.M.B 1515, Kwara State, Nigeria;6. Zoology Department, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India;7. Center for Augmented Intelligence & Data Science (CAIDS), College of Science, Engineering and Technology (CSET), University of South Africa (UNISA), Pretoria, South Africa |
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| Abstract: | The electron spin resonance (ESR) spectrum of the reaction product of superoxide ion, O2−, with chloro-5,10,15,20-tetraphenylporphyrinatochromium(III) Cr(III)(TPP)Cl] shows strong hyperfine interactions with the metal nucleus and the metal ligand, indicating the formation of a superoxide adduct, Cr(IV)(TPP)(Cl)(O2−). The formation of this superoxide adduct was also confirmed by UV-Vis spectroscopy. The reactive character of this superoxide adduct was investigated by ESR spectrometry. It was found that Cr(IV)(TPP)(Cl)(O2−) can oxidize t-butylamine and triphenylphosphine to give the corresponding radical species, respectively, but not pyridine, 4-cyanopyridine or imidazole. These results indicate that the reactive character of Cr(IV)(TPP)- (Cl)(O2−) resembles that of the free superoxide ion. |
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