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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
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 eye.
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

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Reduced salen in a monomeric Fe complex.

Dana M Feldman1, Simon C B Suhr1, Theodore J Gerard1

  • 1Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06511, USA. patrick.holland@yale.edu.

Chemical Communications (Cambridge, England)
|July 16, 2026
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Researchers synthesized the first monomeric metal salen complex in a +1 oxidation state without ion pairing. This breakthrough reveals significant reduced ligand character upon iron(II) salen complex reduction, aiding in predicting Mössbauer parameters.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Computational Chemistry

Background:

  • Transition metal salen complexes are widely studied due to their diverse applications.
  • Previous research often involved ion pairing, complicating the study of the metal center's electronic properties.
  • Understanding the electronic structure of reduced metal complexes is crucial for catalysis and materials science.

Purpose of the Study:

  • To report the synthesis and characterization of the first monomeric, non-ion-paired M(I) transition metal salen complex.
  • To investigate the electronic changes in an iron(II) salen complex upon reduction.
  • To develop a computational method for predicting Mössbauer parameters of iron salen complexes.

Main Methods:

  • Synthesis of a monomeric M(I) transition metal salen complex.
  • Spectroscopic techniques (e.g., UV-Vis, EPR) for electronic structure determination.
  • X-ray crystallography for structural elucidation.
  • Density Functional Theory (DFT) computations for electronic structure analysis and Mössbauer parameter prediction.

Main Results:

  • The first monomeric, non-ion-paired M(I) transition metal salen complex was successfully synthesized.
  • Reduction of an Fe(II) salen complex leads to significant reduced ligand character.
  • A validated computational method for predicting 57Fe Mössbauer parameters of Fe salen complexes was developed.

Conclusions:

  • The electronic structure of M(I) salen complexes can be studied without ion pairing.
  • Reduction significantly alters the electronic distribution within Fe(II) salen complexes, impacting ligand character.
  • The developed computational approach provides accurate predictions for 57Fe Mössbauer spectroscopy, aiding future research.