Spectroscopic and structural investigations of the ferrous and ferric high-spin state of a "picket-fence" porphyrinato acetato iron complex. A refined model for the P460 center of hydroxylamine oxidoreductase

E. Bill, E. L. Bominaar, X. O. Ding, J. Fischer, A. Gismelseed, H. Nasri, A. X. Trautwein, R. Weiss, H. Winkler

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Mössbauer investigations were performed in the ferrous and ferric form of the 'picket-fence' porphyrinato acetato iron complex |Fe(CH3CO2) (TPpivP)|1-,0 at temperatures varying from 1.5-200K and in fields of 0-6.2T. The ferrous complex has an unusually large quadrupole splitting, ΔEQ=+4.25mms-1. The quadrupole splitting in the ferric species, ΔEQ=+1.1mms-1, is as normally found in ferric high-spin iron porphyrins. Spin-Hamiltonian analysis of the magnetic spectra yields zero-field parameters D=-0.9mms-1, E/D=0.33 and magnetic hyperfine parameters Ax,y=-17T, Az=-13.3T in the ferrous high-spin (S=2) complex, and D=7.5cm-1, E/D≈0 and Ax,y,z=20T in the ferric high-spin (S=5/2) species.

Original languageEnglish
Pages (from-to)1295-1298
Number of pages4
JournalHyperfine Interactions
Issue number1-4
Publication statusPublished - Apr 1992


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Electronic, Optical and Magnetic Materials

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