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Complexation Equilibria: The Chelate Effect01:19

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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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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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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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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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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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Cycloaddition Reactions: Overview01:16

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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γ-Cyclodextrin modulates the chemical reactivity by multiple complexation.

J Fernández-Rosas1, M Pessêgo, M Cepeda-Plaza

  • 1Departamento de Química Física, Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago, 15782 Santiago, Spain. luis.garcia@usc.es.

Organic & Biomolecular Chemistry
|November 28, 2014
PubMed
Summary
This summary is machine-generated.

This study reveals how gamma-cyclodextrin (γ-CD) forms complex structures with surfactants and 4-methoxybenzenesulfonyl chloride (MBSC). A cooperative effect leads to a ternary complex, influenced by γ-CD

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Area of Science:

  • Supramolecular Chemistry
  • Physical Organic Chemistry
  • Chemical Kinetics

Background:

  • Cyclodextrins (CDs) are known for their ability to form host-guest complexes.
  • The solvolysis of 4-methoxybenzenesulfonyl chloride (MBSC) is a sensitive probe for studying complexation.
  • Surfactant self-assembly into micelles can significantly alter reaction environments.

Purpose of the Study:

  • To investigate multiple complexation phenomena involving gamma-cyclodextrin (γ-CD), surfactants, and MBSC.
  • To elucidate the role of γ-CD cavity size in dictating complexation mechanisms.
  • To understand the cooperative effects leading to ternary complex formation.

Main Methods:

  • Utilized self-diffusion coefficients (DOSY) to study molecular interactions.
  • Employed chemical kinetics experiments with MBSC solvolysis as a probe.
  • Analyzed the influence of surfactant addition on the reaction system.

Main Results:

  • Observed a complex reactivity pattern upon addition of a third component (surfactant).
  • Identified a cooperative effect leading to the formation of a ternary complex (cyclodextrin-surfactant-MBSC).
  • Demonstrated that γ-CD's larger cavity facilitates a mixed cooperative/competitive mechanism, unlike the competitive mechanism with β-CD.

Conclusions:

  • The larger cavity of γ-CD enables binding of two surfactant chains, promoting cooperative complexation.
  • Formation of 1:1 host-guest complexes increases cavity hydrophobicity, favoring further inclusion.
  • A reduction in available cavity volume must be considered when multiple guests bind to γ-CD.