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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...
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...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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...
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...

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A copper thiolate centre for electron transfer: mononuclear vs. dinuclear complexes.

Marcello Gennari1, Jacques Pécaut, Marie-Noëlle Collomb

  • 1Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Institut de Chimie Moléculaire de Grenoble FR- CNRS-2607, Grenoble, France.

Dalton Transactions (Cambridge, England : 2003)
|February 9, 2012
PubMed
Summary
This summary is machine-generated.

This study details a unique mononuclear copper(II) dithiolate complex with a reversible redox couple. Computational analysis reveals lower reorganization energy compared to related dicopper complexes.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Computational Chemistry

Background:

  • Copper dithiolate complexes are important in catalysis and materials science.
  • Understanding redox properties of copper complexes is crucial for their applications.
  • Previous studies focused on dicopper complexes with μ-thiolato bridges.

Purpose of the Study:

  • To synthesize and characterize a novel mononuclear aliphatic dithiolate Cu(II) complex.
  • To investigate the redox behavior of this complex, specifically the Cu(II)/Cu(I) couple.
  • To compare its properties, particularly reorganization energy, with related dicopper systems.

Main Methods:

  • Structural investigation using X-ray crystallography.
  • Spectroscopic characterization (e.g., UV-Vis, EPR).
  • Density Functional Theory (DFT) calculations to determine electronic structure and energetics.

Main Results:

  • A rare mononuclear aliphatic dithiolate Cu(II) complex was successfully synthesized and characterized.
  • The complex exhibits a reversible Cu(II)/Cu(I) redox couple.
  • DFT calculations indicated a lower reorganization energy for this mononuclear system compared to its dicopper counterpart.

Conclusions:

  • Mononuclear copper dithiolate complexes can offer distinct advantages in redox cycling.
  • Lower reorganization energy suggests potential for improved electrochemical performance.
  • This work expands the understanding of copper-thiolate coordination chemistry and redox activity.