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Formation of Complex Ions03:45

Formation of Complex Ions

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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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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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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EDTA: Chemistry and Properties01:22

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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...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
2.1K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

879
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Dinuclear Silver Complexes in Catalysis.

Tasneem Elkoush1, Natasha D Reich1, Michael G Campbell1

  • 1Department of Chemistry, Barnard College, 3009 Broadway, New York, NY, 10027, USA.

Angewandte Chemie (International Ed. in English)
|June 18, 2021
PubMed
Summary
This summary is machine-generated.

Dinuclear silver complexes are key in many modern synthetic reactions. This review highlights their catalytic roles to improve silver catalyst design for broader applications.

Keywords:
homogeneous catalysisreaction mechanismssilver

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Area of Science:

  • Inorganic Chemistry
  • Organic Synthesis
  • Catalysis

Background:

  • Silver catalysis has seen significant growth in synthetic applications over the last 20 years.
  • Dinuclear silver species are frequently observed as catalysts or intermediates in these reactions.

Purpose of the Study:

  • To review the role of dinuclear silver complexes in homogeneous catalysis.
  • To provide insights for designing more effective silver catalysts.

Main Methods:

  • Literature review of silver-catalyzed reactions.
  • Analysis of the structural and mechanistic roles of dinuclear silver species.

Main Results:

  • Dinuclear silver complexes are prevalent in various catalytic transformations.
  • Understanding these dinuclear species is crucial for catalyst development.

Conclusions:

  • Dinuclear silver complexes play a vital role in homogeneous catalysis.
  • Further exploration of dinuclear silver species will advance catalyst design principles.