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Abstract <p>The electron paramagnetic resonance (EPR) spectra of copper Cu<sup>2+</sup> and iron Fe<sup>3+</sup> ions in ceruloplasmin were studied in a wide temperature range. The copper Cu<sup>2+</sup> ion was shown to be Jahn–Teller active. The EPR spectra of magnetic iron Fe<sup>3+</sup> ions consist of lines with <i>g</i> = 2.06 ± 0.01 and <i>g</i> = 4.33 ± 0.01. The dynamic characteristics of the octahedral Jahn–Teller copper complex (the height of the potential barrier of the crystal field in the nearest environment of copper <i>E</i><sub>0</sub> = 9.16 × 10<sup>–4</sup> eV) and the octahedral iron complex (<i>E</i><sub>0</sub> = 9.89 × 10<sup>–4</sup> eV) were determined from the temperature dependences of the intensities of EPR lines.</p>

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Dynamic Characteristics of the Octahedral Jahn–Teller Copper Cu2+ Complex and the Octahedral Iron Fe3+ Complex in Ceruloplasmin. Electron Paramagnetic Resonance Method

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • V. A. Shapovalov,
  • N. V. Tokiy,
  • T. V. Drokina,
  • A. M. Vorotynov

摘要

Abstract

The electron paramagnetic resonance (EPR) spectra of copper Cu2+ and iron Fe3+ ions in ceruloplasmin were studied in a wide temperature range. The copper Cu2+ ion was shown to be Jahn–Teller active. The EPR spectra of magnetic iron Fe3+ ions consist of lines with g = 2.06 ± 0.01 and g = 4.33 ± 0.01. The dynamic characteristics of the octahedral Jahn–Teller copper complex (the height of the potential barrier of the crystal field in the nearest environment of copper E0 = 9.16 × 10–4 eV) and the octahedral iron complex (E0 = 9.89 × 10–4 eV) were determined from the temperature dependences of the intensities of EPR lines.