ESR evidence of the formation of a new superoxide complex of tetra-p-tolyporphyrinatocobalt(II) in aprotic solvents |
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| Institution: | 1. Sultan Moulay Slimane University of Beni Mellal, Laboratory of Chemistry, Modeling and Environmental Sciences, Polydisciplinary faculty, 25 000 Khouribga, Morocco;2. Chouaib Doukkali University, Faculty of Sciences, Laboratory of Organic Bioorganic Chemistry and Environment, El Jadida, Morocco;3. Sidi Mohamed Ben Abdellah University, City of Innovation, Immouzer Road, B. P 2626 Fez, Morocco;4. Sidi Mohamed Ben Abdellah University, Engineering Laboratory of Organometallic, Molecular Materials, and Environment, Faculty of Sciences, Fez, Morocco;1. Department of Animal Science, University of Minnesota, St. Paul, MN;2. Department of Veterinary Population Medicine, University of Minnesota, St. Paul, MN;3. Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI;4. Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN |
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| Abstract: | The reactions of the superoxide ion (O2−) with tetra-p-tolyporphyrinatocobalt(II) Co(II)TTP] in dimethyl sulfoxide(DMSO) have been investigated by use of electron spin resonance (ESR) spectroscopy. In the absence of oxygen, Co(II)TTP in DMSO gives the DMSO adduct, Co(II)(TPP)(DMSO). When this DMSO adduct is exposed to air, an oxygen complex, Co(II)(TTP)(DMSO)(O2), is formed in which the binding state between Co(II) and O2 has been considered formally as Co(III)O2−. When the superoxide ion (O2− is added to this oxygen complex, a new superoxide complex, Co(II)(TTP)(O2−)2, is formed. The same superoxide adduct is formed by the reaction of O2− with Co(II)TTP in the absence of oxygen. |
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