Related Experiment Video
Updated: Nov 19, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
A Molecular Low-Coordinate [Fe-S-Fe] Unit in Three Oxidation States
Christian Schneider1, Serhiy Demeshko2, Franc Meyer2
1Fachbereich Chemie, Philipps-Universität, Hans-Meerwein-Str. 4, 35043, Marburg, Germany.
Researchers synthesized a dinuclear iron complex mimicking the nitrogenase enzyme's active site. This iron-sulfur-iron complex can be reversibly oxidized, offering insights into nitrogenase mechanisms and iron-sulfur cluster chemistry.
Area of Science:
- Bioinorganic Chemistry
- Organometallic Chemistry
- Enzyme Active Site Mimicry
Background:
- The iron-molybdenum cofactor (FeMoco) of nitrogenase contains a unique [Fe-S-Fe] subunit crucial for nitrogen fixation.
- Understanding the reactivity and electronic structure of this core is vital for bioinorganic chemistry and catalysis.
Purpose of the Study:
- To synthesize and characterize a dinuclear iron complex that models the [Fe-S-Fe] subunit of FeMoco.
- To investigate the redox properties and structural stability of this model complex.
Main Methods:
- Crystallographic characterization
- 57Fe Mössbauer spectroscopy
- SQUID magnetometry
- Chemical oxidation studies
Main Results:
- A dinuclear monosulfido bridged diiron(II) complex with geometry similar to the FeMoco active site was synthesized.
- The complex was stepwise oxidized to diiron(II/III) and diiron(III/III) states, retaining the [Fe-S-Fe] core.
- Cleavage of the [Fe-S-Fe] unit by carbon disulfide was demonstrated.
Conclusions:
- The synthesized complex serves as a robust model for the [Fe-S-Fe] core of FeMoco.
- The study provides insights into the redox behavior and stability of iron-sulfur clusters relevant to nitrogenase function.
More Related Videos
07:44Determining the Chemical Composition of Corrosion Inhibitor/Metal Interfaces with XPS: Minimizing Post Immersion Oxidation
Published on: March 15, 2017
07:55Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
Related Concept Videos
Properties of Transition Metals
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
Ladder Diagrams: Redox Equilibria
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Valence Bond Theory
Coordination Number and Geometry
Coordination Compounds and Nomenclature