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Oxoferryl porphyrin cation radicals in model systems: Evidence for variable metal-radical spin coupling

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Abstract

Magnetic properties of frozen solutions of highly oxidized iron porphyrin complexes were investigated by EPR and Mössbauer spectroscopy. The Mössbauer spectra, recorded at low temperatures in various magnetic fields, were analyzed on the basis of spin Hamiltonian simulations. Spin coupling between ferryl iron (FeIV) and porphyrin cation radical was taken into account explicitly. Hyperfine and spin-coupling parameters are given for several complexes, together with zero-field parameters. One of the complexes exhibits weak spin coupling, it is the first model system exhibiting properties comparable to those of the oxoferryl cation radical enzyme Horse Radish Peroxidase I.

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Authors and Affiliations

  1. Institut für Physik, Medizinische Universität, 2400, Lübeck, FRG

    E. Bill, E. L. Bominaar, X. -Q. Ding, A. X. Trautwein & H. Winkler

  2. Institut Le Bel, Université Louis Pasteur, 67070, Strasbourg, France

    D. Mandon & R. Weiss

  3. Department of Environmental Sciences and Engineering, The University of North Carolina, NC27599, Chapel Hill, U.S.A.

    A. Gold, K. Jayaraj & G. E. Toney

Authors
  1. E. Bill
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  2. E. L. Bominaar
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  3. X. -Q. Ding
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  4. A. X. Trautwein
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  5. H. Winkler
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  6. D. Mandon
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  7. R. Weiss
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  8. A. Gold
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  9. K. Jayaraj
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  10. G. E. Toney
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Bill, E., Bominaar, E.L., Ding, X.Q. et al. Oxoferryl porphyrin cation radicals in model systems: Evidence for variable metal-radical spin coupling. Hyperfine Interact 58, 2343–2348 (1990). https://doi.org/10.1007/BF02398341

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  • DOI: https://doi.org/10.1007/BF02398341

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