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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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Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

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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...
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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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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.1K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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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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Energetics of Solution Formation02:35

Energetics of Solution Formation

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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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Updated: May 10, 2025

Assembly and Characterization of Polyelectrolyte Complex Micelles
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Assembly and Characterization of Polyelectrolyte Complex Micelles

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Thermodynamic insights into polyelectrolyte complexation: A theoretical framework.

Souradeep Ghosh1

  • 1Department of Physical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India and Department of Biomedical Engineering and Center for Biomolecular Condensates, Washington University in St. Louis, St. Louis, Missouri 63105, USA.

The Journal of Chemical Physics
|April 23, 2025
PubMed
Summary
This summary is machine-generated.

Complex coacervation of polyelectrolytes (PEs) depends on ion binding and entropy. Local dielectric properties significantly influence global behavior, explaining experimental and computational discrepancies in charged polymer complexation.

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Area of Science:

  • Polymer Physics
  • Physical Chemistry
  • Soft Matter Science

Background:

  • Complex coacervation is a phase separation phenomenon crucial in biological and synthetic systems.
  • Understanding the driving forces behind polyelectrolyte complexation is essential for controlling material properties.

Purpose of the Study:

  • To develop a theoretical framework for analyzing polyelectrolyte interactions and complex coacervation.
  • To investigate the influence of ion binding, free ion entropy, and local dielectric properties on the thermodynamic behavior of charged polymer systems.

Main Methods:

  • Calculation of system free energy considering position-dependent interactions.
  • Analysis of polymer chain conformations and local dielectricity upon overlap.
  • Theoretical modeling of electrostatic interactions and entropic contributions.

Main Results:

  • Reaffirmation that ion binding and free ion entropy are key drivers of complex coacervation.
  • Demonstration that local dielectric constant significantly shapes global thermodynamic behavior.
  • Discovery of an inverse relationship between entropy gain and local dielectric constant at constant electrostatic temperature.

Conclusions:

  • Local factors, such as dielectric constant, are critical for understanding the thermodynamics of polyelectrolyte complexation.
  • The theoretical framework explains discrepancies between experimental and computational studies.
  • Polymer-specific parameters are vital for accurate predictions of charged polymer complexation behavior.