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Complexometric Titration: Ligands

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...

Complexation Equilibria: The Chelate Effect

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...

Bioavailability Enhancement: Drug Stability Enhancement and GI Retention

Bioavailability Enhancement: Drug Stability Enhancement and GI Retention

Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...

Complexation Equilibria: Overview

Complexation Equilibria: Overview

Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...

EDTA: Chemistry and Properties

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...

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

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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Related Experiment Video

Updated: Jul 19, 2026

Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides

Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides

Published on: July 14, 2015

Complexation chemistry for tuning release from polymer coatings.

Camilla Fant¹, Paul Handa, Magnus Nydén

¹Cell and Molecular Biology/Biolpolymer Products AB, Göteborg University, Box 462, SE-405 30 Göteborg, Sweden.

The Journal of Physical Chemistry. B

|October 27, 2006

Summary

Metal ion complexation with poly(1-vinylimidazole-co-methyl methacrylate) (PVM) and copper ions (Cu2+) creates a marine paint delivery system for antifouling agents (AFA). This system effectively controls AFA release, offering a tunable antifouling solution.

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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides

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Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks

Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks

Published on: May 8, 2015

Area of Science:

Materials Science
Polymer Chemistry
Surface Chemistry

Background:

Marine paints require effective antifouling agents (AFA) to prevent biofouling.
Designing controlled-release systems for AFAs is crucial for long-term antifouling performance.
Metal ion complexation offers a potential strategy for developing such delivery systems.

Purpose of the Study:

To design and investigate a metal ion complexation-based delivery system for an antifouling agent (Medetomidine) in marine paints.
To explore the use of poly(1-vinylimidazole-co-methyl methacrylate) (PVM) complexed with Cu2+ or Zn2+ for coordinating Medetomidine.
To evaluate the coordination strength and release characteristics of the antifouling agent from the complexed polymer system.

Main Methods:

Solution-based investigation using 1H Nuclear Magnetic Resonance (1H NMR) spectroscopy.
Solid surface analysis utilizing Quartz Crystal Microbalance with Dissipation monitoring (QCM-D).
Surface Plasmon Resonance (SPR) measurements to assess surface interactions and adsorption.

Main Results:

Strong interactions were confirmed between Cu2+ and the PVM polymer, and between Medetomidine and the PVM-Cu2+ complex via 1H NMR.
Cu2+ showed higher affinity for the PVM surface than Zn2+, leading to increased polymer film swelling (QCM-D, SPR).
The PVM-Cu2+ complex demonstrated high Medetomidine adsorption with low desorption rates, unlike the Zn2+ system.

Conclusions:

The choice of metal ion (Cu2+ vs. Zn2+) significantly influences the coordination strength and adsorption/desorption behavior of Medetomidine.
Metal ion complexation provides a tunable approach for controlling the release rate of antifouling agents from marine paint formulations.
This strategy holds promise for developing advanced, long-lasting antifouling marine coatings.