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Formation of Complex Ions

Formation of Complex Ions

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...

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...

Intermolecular Forces

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...

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...

Factors Affecting Activity Coefficient

Factors Affecting Activity Coefficient

The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size.
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...

Intermolecular Forces in Solutions

Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...

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Related Experiment Video

Updated: Jul 4, 2025

Assembly and Characterization of Polyelectrolyte Complex Micelles

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Ionic Strength-Dependent Structure of Complex Coacervate Core Micelles.

Tae-Young Heo¹, Soo-Hyung Choi¹

¹Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea.

The Journal of Physical Chemistry. B

|January 30, 2024

Summary

This summary is machine-generated.

The study reveals how salt concentration affects complex coacervate core micelles (C3Ms). Increasing salt reduces micelle core size and aggregation number, while corona thickness remains stable, impacting polymer self-assembly.

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Last Updated: Jul 4, 2025

Assembly and Characterization of Polyelectrolyte Complex Micelles

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Published on: March 2, 2020

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Area of Science:

Polymer Chemistry
Supramolecular Chemistry
Materials Science

Background:

Complex coacervate core micelles (C3Ms) are self-assembled structures formed by block copolyelectrolytes in aqueous media.
Understanding their structural response to environmental factors like salt concentration is crucial for designing advanced materials.

Purpose of the Study:

To investigate the salt concentration-dependent structure of C3Ms formed by polyether-based block copolyelectrolytes.
To establish scaling relationships between structural parameters and salt concentration.

Main Methods:

Light scattering techniques.
Small-angle X-ray and neutron scattering (SAX/NS).

Main Results:

Increasing salt concentration significantly decreases core radius (Rcore) and aggregation number (Nagg).
Corona thickness (Lcorona) remains largely unchanged with varying salt concentrations.
Salt lowers interfacial tension, leading to more relaxed core block conformations.

Conclusions:

A scaling relationship between C3M structure and salt concentration was determined.
The free energy contribution of core block stretching is significant due to swollen cores.
Findings provide insights into the thermodynamics and structural control of C3Ms.