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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Ladder Diagrams: Redox Equilibria

Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Crystal Field Theory
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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A density functional theory study on ligand additive effects on redox potentials.

Jan Moens1, Frank De Proft, Paul Geerlings

  • 1Department of General Chemistry, Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium. Jan.Moens@vub.ac.be

Physical Chemistry Chemical Physics : PCCP
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PubMed
Summary

This study uses density functional theory to analyze metal complexes. Ligand effects on redox potential are additive and predictable, aiding in constructing electrochemical series for various metals.

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Area of Science:

  • Inorganic Chemistry
  • Computational Chemistry
  • Electrochemistry

Background:

  • Redox potentials of metal complexes are crucial in various chemical processes.
  • Understanding ligand effects on metal redox behavior is key to designing new materials.
  • Previous models for predicting redox potentials have limitations.

Purpose of the Study:

  • To compute adiabatic energy differences for oxidation half reactions of [M(CO)nL(6-n)] complexes.
  • To investigate the additive nature of ligand effects on redox potentials.
  • To develop a reliable method for constructing electrochemical series.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Adiabatic energy differences (ΔE(adiabatic)) were computed for oxidation half reactions.
  • Linear regression analysis and energy decomposition analysis were performed.

Main Results:

  • Linear trends in ΔE(adiabatic) with respect to CO substitution number (n(CO)) were observed.
  • Ligand-specific parameters were derived, independent of metal type (Ru, Os, Tc).
  • A computed electrochemical series showed good agreement with established parameters (Pickett's P(L), Lever E(L)(L), CEP).
  • Linearity in ΔE(adiabatic) correlated with structural properties like M-CO bond distances.

Conclusions:

  • Ligand effects on redox potentials are additive and can be quantified by ligand-specific parameters.
  • The DFT-based approach provides a reliable method for predicting electrochemical behavior.
  • Energy decomposition analysis offers insights into ligand bonding properties.