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Ionic Association

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.

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...

Intermolecular Forces

Intermolecular Forces

Theory of Strong Electrolytes

Theory of Strong Electrolytes

The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...

Molecular and Ionic Solids

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

Aqueous Solutions and Heats of Hydration

Aqueous Solutions and Heats of Hydration

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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Related Experiment Video

Updated: Mar 15, 2026

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

Charge-Induced Long-Range Order in a Room-Temperature Ionic Liquid.

Ke Ma¹, Romana Jarosova¹, Greg M Swain¹

¹Department of Chemistry, Michigan State University , 578 South Shaw Lane, East Lansing, Michigan 48824, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 27, 2016

Summary

This study shows room-temperature ionic liquids exhibit long-range order due to surface charges. This charge-induced ordering in ionic liquids (ILs) was observed up to 100 micrometers from a silica surface.

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Published on: May 15, 2017

Area of Science:

Physical Chemistry
Materials Science
Surface Science

Background:

Room-temperature ionic liquids (ILs) are salts that are liquid at ambient temperatures.
Surface interactions can significantly alter the properties of ILs.
Understanding IL behavior near surfaces is crucial for applications in nanotechnology and electrochemistry.

Purpose of the Study:

To provide direct evidence for charge-induced long-range order in ionic liquids.
To investigate the influence of surface charge on the dynamics within an ionic liquid.
To explore the role of surface modification on IL ordering.

Main Methods:

Utilized rotational diffusion dynamics measurements of anionic, cationic, and neutral chromophores.
Varied the distance from a silica surface to probe spatial variations.
Employed surface capping with Me2SiCl2 to assess the impact of surface termination.
Compared results with ethylene glycol as a control solvent.

Main Results:

Observed charge-induced ordering in 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM(+)BF4(-)) up to approximately 100 μm from a negatively charged silica surface.
Demonstrated that the observed dynamics correlate with the excess charge density gradient induced by the surface.
Found spatially invariant reorientation dynamics in ethylene glycol and in the IL when the silica surface was capped, indicating the importance of surface charge.

Conclusions:

Ionic liquids exhibit significant long-range order driven by surface charges.
The phenomenon is attributed to a spatially damped piezoelectric response within the IL, influenced by its fluidity and disorder.
Surface modification can eliminate this charge-induced ordering.