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Related Concept Videos

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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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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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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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EDTA: Auxiliary Complexing Reagents01:26

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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...
1.6K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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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From crab shells to smart systems: chitosan-alkylethoxy carboxylate complexes.

Leonardo Chiappisi1, Sylvain Prévost, Isabelle Grillo

  • 1Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin , Straße des 17, Juni 124, Sekretariat TC 7, D-10623 Berlin, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 14, 2014
PubMed
Summary

This study presents the self-assembly of chitosan and alkyl ethylene oxide carboxylates into tunable supramolecular structures like micelles and vesicles. These biofriendly materials offer versatile applications in drug delivery and coatings due to their controlled properties.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • Chitosan, a biopolymer, is known for its biocompatibility and bioactivity.
  • Anionic surfactants can interact with charged biopolymers to form complex structures.
  • Controlling self-assembly is key to developing advanced functional materials.

Purpose of the Study:

  • To investigate the self-assembly of alkyl ethylene oxide carboxylates with chitosan.
  • To explore the formation of various supramolecular structures.
  • To demonstrate tunable structural characteristics for potential applications.

Main Methods:

  • Self-assembly of chitosan and anionic surfactants at pH 4.0.
  • Varying alkyl chain length and ethylene oxide units of surfactants.
  • Adjusting the mixing ratio of chitosan and surfactant.

Main Results:

  • Formation of water-soluble complexes, including globular micelles and ordered multiwalled vesicles.
  • Tunable structural characteristics, such as vesicle wall thickness (5-50 nm), controlled by mixing ratio.
  • Development of a method for preparing chitosan-based complexes in the solid state with mesoscopic order.

Conclusions:

  • Chitosan-surfactant complexes offer versatile structures in both aqueous and solid phases.
  • These complexes can serve as carriers for hydrophilic and hydrophobic molecules with tunable release.
  • Potential applications include drug delivery systems and coatings for medical implants, leveraging chitosan's inherent properties.