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Related Concept Videos

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...
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Complexometric Titration: Ligands

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...
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...
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Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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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.
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Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study
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Nitroxide bound beta-cyclodextrin: is there an inclusion complex?

David Bardelang1, Antal Rockenbauer, Laszlo Jicsinszky

  • 1UMR 6517 CNRS et Aix-Marseille Université, Avenue Escadrille Normandie-Niemen, Marseille 13397, France.

The Journal of Organic Chemistry
|September 26, 2006
PubMed
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A novel nitroxide radical derivative, 236CDTIPNO, was synthesized and its self-association in water was confirmed. EPR spectroscopy revealed thermodynamic parameters for its self-inclusion reaction, indicating a weak association equilibrium.

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Area of Science:

  • Supramolecular Chemistry
  • Free Radical Chemistry
  • Physical Chemistry

Background:

  • Persistent nitroxide radicals like TIPNO are valuable spin probes.
  • Cyclodextrins are known for their host-guest complexation abilities.
  • Understanding self-association is crucial for designing functional supramolecular systems.

Purpose of the Study:

  • To synthesize and characterize 236CDTIPNO, a novel derivative of TIPNO covalently bound to permethylated-beta-cyclodextrin.
  • To investigate the self-association behavior of 236CDTIPNO in aqueous solutions.
  • To determine the thermodynamic parameters governing the self-inclusion reaction of 236CDTIPNO.

Main Methods:

  • Synthesis of 236CDTIPNO.
  • Solvent- and competition-dependent Electron Paramagnetic Resonance (EPR) spectroscopy.
  • Temperature-dependent EPR spectra simulation using a novel 2D (field-temperature) program.
  • Analysis using Arrhenius and Eyring models.

Main Results:

  • Confirmed self-association of 236CDTIPNO in water using EPR spectroscopy with competing cyclodextrin hosts (DIMEB, TRIMEB).
  • Successfully simulated temperature-dependent EPR spectra to separate relaxation and chemical exchange effects.
  • Determined thermodynamic parameters, including activation free enthalpies of ~34 kJ/mol for forward and backward steps, consistent with weak association.

Conclusions:

  • 236CDTIPNO exhibits self-association in water, forming a weakly associated complex.
  • The developed EPR simulation method effectively characterizes self-inclusion reactions even in the fast exchange regime.
  • This study provides insights into the supramolecular behavior of cyclodextrin-radical conjugates.