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Related Concept Videos

Ionic Association01:28

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 Forces03:13

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 bonds, and dispersion...
Aqueous Solutions and Heats of Hydration02:42

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...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Theory of Strong Electrolytes01:23

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...
Common Ion Effect03:24

Common Ion Effect

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Interaction between ionic liquids and beta-cyclodextrin: a discussion of association pattern.

Yifeng He1, Qingde Chen, Chao Xu

  • 1Department of Applied Chemistry, Peking University, Beijing 100871, China.

The Journal of Physical Chemistry. B
|December 17, 2008
PubMed
Summary

This study details how three ionic liquids interact with beta-cyclodextrin (beta-CD). The alkyl side chain of the ionic liquid enters the beta-CD cavity, influencing binding strength.

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Published on: December 20, 2016

Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Ionic liquids (ILs) are versatile compounds with tunable properties.
  • Beta-cyclodextrin (beta-CD) is a cyclic oligosaccharide known for its ability to form inclusion complexes.

Purpose of the Study:

  • To investigate the interaction between specific ionic liquids and beta-cyclodextrin.
  • To determine the binding stoichiometry and association constants of IL-beta-CD complexes.
  • To elucidate the structural aspects governing the interaction, specifically the role of the alkyl side chain.

Main Methods:

  • Competitive fluorescence spectroscopy
  • Conductivity measurements
  • (19)F Nuclear Magnetic Resonance ((19)F NMR) spectroscopy

Main Results:

  • 1:1 inclusion complexes were identified for 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (11) and 1-hexyl-2,3-dimethylimidazolium chloride (16) with beta-CD.
  • Association constants were quantified, revealing differences in interaction strength based on IL structure.
  • The alkyl side chain of the IL, not the imidazolium ring, was found to be the primary interacting moiety within the beta-CD cavity.
  • Simultaneous interaction of both cation and anion of 1-dodecyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (17) with beta-CD was observed.

Conclusions:

  • The alkyl side chain length and structure significantly influence the binding affinity of ionic liquids to beta-cyclodextrin.
  • A general interaction pattern between ionic liquids and beta-cyclodextrin was proposed based on the experimental findings.
  • These findings contribute to understanding IL-host interactions for potential applications in separation, delivery, or catalysis.