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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.

Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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...

Stereoisomerism

Stereoisomerism

Isomerism in Complexes
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Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

Aqueous Solutions and Heats of Hydration

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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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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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Differences in Ion Interactions for Isoelectronic Ionic Liquid Homologs.

Heather Y Lee¹, Hideaki Shirota², Edward W Castner¹

¹†Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States.

The Journal of Physical Chemistry Letters

|August 19, 2015

Summary

Nuclear Overhauser effect (NOE) 2D NMR revealed specific cation-anion interactions in four isoelectronic ionic liquids. Interactions were observed between the anion and protons on cationic head groups and tail groups.

Keywords:

2D NMR HOESY NOE ion interactions ionic liquid structure

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On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids

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Published on: March 2, 2012

Area of Science:

Physical Chemistry
Materials Science
Supramolecular Chemistry

Background:

Ionic liquids (ILs) are salts that are liquid at ambient temperatures, with tunable properties.
Understanding cation-anion interactions is crucial for designing ILs with specific functionalities.
Isoelectronic ionic liquids offer a unique platform to study the influence of cation structure on interactions.

Purpose of the Study:

To investigate specific cation-anion interactions in four isoelectronic ionic liquids.
To explore the proximity between ions using advanced NMR techniques.
To elucidate the role of cationic structure, including head and tail groups, in IL interactions.

Main Methods:

Utilized nuclear Overhauser effect (NOE) 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
Investigated four ionic liquids: bis(trifluoromethylsulfonyl)amide anion paired with triethyloctylammonium, (2-ethoxyethoxy)ethyltriethylammonium, triethyloctylphosphonium, and (2-ethoxyethoxy)ethyltriethylphosphonium cations.
Analyzed interactions between the anion's fluorine nuclei and protons on the cations' ethyl chains.

Main Results:

Observed substantial interactions between the anion's fluorine (19F) nuclei and protons on the triethyl chains of all four cationic head groups.
Detected significantly different interactions between the anions and the four distinct cationic tail groups.
Demonstrated the sensitivity of NOE 2D NMR in differentiating subtle structural influences on IL interactions.

Conclusions:

Cation structure, particularly the nature of both head and tail groups, significantly influences cation-anion interactions in ionic liquids.
NOE 2D NMR is a powerful tool for characterizing ion proximities and understanding structure-property relationships in ionic liquids.
Findings provide insights for the targeted design of ionic liquids with tailored properties for various applications.