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

Key Points

• This study investigates the dynamic characteristics of copper Cu2+ and iron Fe3+ complexes in ceruloplasmin using EPR spectroscopy.
• Analyzed EPR spectra of Cu2+ and Fe3+ ions in ceruloplasmin across a broad temperature range.
• Determined potential barriers of the Jahn-Teller copper and octahedral iron complexes from temperature dependence of EPR line intensities.
• Copper Cu2+ was shown to be Jahn-Teller active with a potential barrier of E0 = 9.16 × 10–4 eV.
• Iron Fe3+ complex exhibited EPR lines with g = 2.06 ± 0.01 and g = 4.33 ± 0.01.
• The potential barrier for the iron complex was measured at E0 = 9.89 × 10–4 eV.