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Chapitre 20
Propriétés des métaux de transition
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups…
Composés de coordination et nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For…
Liaisons métal-ligand
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain…
Nombre de coordination et géométrie
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers…
Isomérisme structural
Isomerism in Complexes Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can…
Stéréoisomérisme
Isomers are different chemical species that have the same chemical formula. Transition metal complexes often exist as geometric isomers, in which…
Théorie de la liaison de valence
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from…
Théorie du champ cristallin : complexes octaédriques
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons…
Théorie du champ cristallin : complexes tétraédriques et plans carrés
Tetrahedral Complexes Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes…
Couleurs et magnétisme
Color in Coordination Complexes When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals.…
Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
Chemical model complexes are prepared to represent the active site of an enzyme. In this protocol, a family of tridentate pincer ligand precursors…
Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
This article shows how the COLTRIMS (Cold Target Recoil Ion Momentum Spectroscopy) or the "reaction microscope" technique can be used to distinguish…
Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
The size, size distribution and stability of colloidal nanoparticles are greatly affected by the presence of capping ligands. Despite the key…

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