Spectral and kinetic investigation on oxidation and reduction of water soluble porphyrin-manganese(III) complex |
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| Authors: | Rita Giovannetti Leila Alibabaei Filippo Pucciarelli |
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| Affiliation: | Chemistry Section of Environmental Sciences Department, Camerino University, Via S. Agostino, 1, 62032 Camerino, Italy |
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| Abstract: | In this work the oxidation and reduction reactions of MnIII-Coproporphyrin-I (MnIII-CPI) have been studied and four forms of manganese-CPI complexes have been characterized. This complex was observed to be highly reactive (at basic pH) towards Mn(II), hypochlorite, hydrogen peroxide and oxone, forming [MnIV(O)CPI(OH)]− that was unstable and, after a short time, formed again [MnIIICPI(OH)2]−. With an excess of NaClO, a further oxidation of the complex [MnIV(O)CPI(OH)]−, provoked a significant spectral change for the [MnV(O)CPI(OH)] formation that showed, in the time, a partial polymerization. [MnIIICPI(OH)2]− was reduced by sodium dithionite to form the very unstable complex of [MnIICPI(OH)]− that successively degraded with Mn(II) release. |
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| Keywords: | Coproporphyrin-I Manganese-complexes Kinetic UV-Vis spectroscopy |
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