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Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry (CE-ICP-MS) for Quantification of Iron Redox Species (Fe(II), Fe(III))
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Biologically relevant heterodinuclear iron-manganese complexes.

Michaël Carboni1, Martin Clémancey, Florian Molton

  • 1Laboratoire de Chimie et Biologie des Métaux-pmb, UMR 5249, Université Joseph Fourier-Grenoble 1/CEA-DSV-iRTSV/CNRS, Grenoble F-38054, France.

Inorganic Chemistry
|September 20, 2012
PubMed
Summary

Synthesized iron-manganese complexes model nonheme enzymes, revealing antiferromagnetic interactions between metal ions. These findings offer insights into the electronic structure of biologically relevant iron-manganese enzyme active sites.

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Area of Science:

  • Bioinorganic Chemistry
  • Coordination Chemistry
  • Enzyme Mimicry

Background:

  • Nonheme iron and manganese enzymes play crucial biological roles.
  • Understanding the active sites of these enzymes is essential for elucidating their mechanisms.
  • Heterodinuclear complexes serve as valuable models for studying metalloenzyme active sites.

Purpose of the Study:

  • To synthesize and characterize novel heterodinuclear iron-manganese complexes.
  • To model the active sites of the Fe/Mn class of nonheme enzymes.
  • To investigate the magnetic and electronic properties of these model complexes.

Main Methods:

  • Synthesis and characterization of heterodinuclear complexes [Fe(III)Mn(II)(L-Bn)(μ-OAc)(2)](ClO(4))(2) and [Fe(II)Mn(II)(L-Bn)(μ-OAc)(2)](ClO(4)).
  • X-ray crystallography for structural determination of compound 1.
  • Mössbauer spectroscopy, 1H NMR spectroscopy, magnetic susceptibility measurements, and electron paramagnetic resonance (EPR) studies.

Main Results:

  • Structural elucidation revealed an Fe(III)Mn(II)μ-phenoxobis(μ-carboxylato) core.
  • Mössbauer and NMR spectroscopies confirmed the single location of Fe(III) and Fe(II) ions, respectively.
  • Moderate to weak antiferromagnetic interactions were observed between Fe and Mn ions (J = 20 cm(-1) for complex 1, J = 5.72-6.8 cm(-1) for complex 2).
  • Electrochemical studies showed a quasireversible electron transfer corresponding to the Fe(III)Mn(II)/Fe(II)Mn(II) couple.

Conclusions:

  • The synthesized complexes effectively model the biologically relevant Fe/Mn nonheme enzyme active sites.
  • The study provides detailed insights into the magnetic coupling and electronic structure of these dinuclear systems.
  • The findings contribute to a deeper understanding of the structure-function relationships in iron-manganese metalloenzymes.