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Investigation of iron(III) complex with crown-porphyrin

Abstract

Iron complex of 5-(4-(((4′-hydroxy-benzo-15-crown-5)-5′-yl)diazo)phenyl)-10,15,20-triphenylporphyrin was investigated by 57Fe Mössbauer spectroscopy and EPR. Two Fe sites were identified; they give two differing signals, doublet and wide absorption in a large velocity interval. EPR spectra of solutions of the complex in chloroform at room temperature also show two signals with g = 2.064, AFe = 0.032 cm − 1; g = 2.015, AFe = 0.0034 cm − 1. The doublet asymmetry is studied vs. temperature and normal angle to the sample plane and gamma-beam. The isomer shift δ in the doublet varies from 0.25 to 0.41 mm/s in the 360–5 K temperature range, whereas quadruple splitting value is constant, Δ ∼ 0.65 mm/s. The relax absorption may be described as a wide singlet (δ = 0.30– 0.44 mm/s and Γ = 2.83–3.38 mm/s); its relative area strongly depends on temperature. According to δ, both signals are assigned to Fe(III).

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Correspondence to Denis A. Pankratov.

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Pankratov, D.A., Dolzhenko, V.D., Stukan, R.A. et al. Investigation of iron(III) complex with crown-porphyrin. Hyperfine Interact 222 (Suppl 1), 1–11 (2013). https://doi.org/10.1007/s10751-011-0378-5

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  • DOI: https://doi.org/10.1007/s10751-011-0378-5

Keywords

  • Iron(III) complex
  • Crown-porphyrin
  • Mössbauer spectroscopy
  • EPR