Nuclear resonant forward scattering using synchrotron radiation applied to study the low-spin ferriheme complex [TPPFe(NH2PzH)2]Cl

  • R. Benda
  • C. Herta
  • V. Schünemann
  • H. Winkler
  • A. X. Trautwein
  • Y. Shvyd’ko
  • F. A. Walker
Conference paper

Abstract

We have characterised the low-spin ferriheme complex bis(3-aminopyrazole)tetraphenyl-porphyrinatoiron(III) chloride ([TPPFe(NH2PzH)2]Cl) by nuclear resonant forward scattering (NFS) using synchrotron radiation at 4.2K in fields up to 6T. The analysis of the field dependant NFS spectra obtained with the g-tensor determined by previous pulsed EPR measurements [1] (g=(1.87, 2.28, 2.39)) yields the hyperfine parameters η = 0.0; β = 90°; y = 90°; ΔEQ = −2.56 mm/s and A/μngn = (−46.9, 9.5, 17.6) T. This investigation shows that NFS provides higher accuracy in determining hyperfine parameters than conventional Mössbauer spectroscopy, if the delay time is long enough and the effective thickness is relatively high (in the present case t ≈ 150 ns and teff ≈ 10).

Keywords

Catalysis Pseudomonas Porphyrin Haas Coord 

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Copyright information

© Springer Science+Business Media Dordrecht 2002

Authors and Affiliations

  • R. Benda
    • 1
  • C. Herta
    • 1
  • V. Schünemann
    • 1
  • H. Winkler
    • 1
  • A. X. Trautwein
    • 1
  • Y. Shvyd’ko
    • 2
  • F. A. Walker
    • 3
  1. 1.Institute of PhysicsMed. UniversityLübeckGermany
  2. 2.Institute of Exp. PhysicsUniversity of HamburgHamburgGermany
  3. 3.Department of ChemistryUniversity of ArizonaTucsonUSA

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