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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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.
Lattice Energies of Ionic Crystals01:27

Lattice Energies of Ionic Crystals

Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
Ionic Bonds00:42

Ionic Bonds

When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.Opposing Charges Hold Ions Together in Ionic CompoundsIonic bonds are reversible electrostatic interactions between ions with...

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

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

Published on: March 24, 2018

Local structure in ionic liquids investigated by hyper-Rayleigh scattering.

V Rodriguez1, J Grondin, F Adamietz

  • 1Institut des Sciences Moléculaires-UMR 5255 CNRS, Université de Bordeaux, 351 cours de la Libération, 33405 Talence Cedex, France. v.rodriguez@ism.u-bordeaux1.fr

The Journal of Physical Chemistry. B
|October 30, 2010
PubMed
Summary

Ionic liquids exhibit a dominant octopolar nature due to transient ion clusters. This complex local structure, revealed by hyper-Rayleigh scattering, highlights nonadditive interactions in ionic liquid systems.

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

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Last Updated: Jun 7, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
07:19

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Ionic liquids (ILs) are salts that are liquid at room temperature, with applications in various fields.
  • Understanding the local structure and interactions within ILs is crucial for optimizing their properties.
  • Hyper-Rayleigh scattering (HRS) is a nonlinear optical technique sensitive to the local structure of liquids.

Purpose of the Study:

  • To investigate the local structure and multipolar nature of various ionic liquids.
  • To elucidate the origin of the observed hyperpolarizability in ionic liquids.
  • To understand the role of transient ion clustering and nonadditive interactions in ILs.

Main Methods:

  • Hyper-Rayleigh scattering (HRS) measurements were performed on ionic liquids with imidazolium, pyrrolidinium, and alkyl ammonium cations and various anions.
  • Density functional theory (DFT) calculations were employed to model ion pair clusters of varying sizes.
  • Analysis of HRS data was interpreted in terms of elementary structural (ES) entities and their multipolar contributions.

Main Results:

  • HRS measurements revealed a predominantly octopolar nature of the elementary structural entities in the studied ionic liquids.
  • DFT calculations supported the HRS findings, attributing the octopolar hyperpolarizability to complex local structures formed by transient ion clusters.
  • The formation of these transient ion clusters occurs within the time scale of HRS observation (~10^-12 to 10^-14 s).

Conclusions:

  • The octopolar nature of ionic liquids is a consequence of transient ion clustering and nonadditive interactions within the first solvation shell (<1 nm).
  • HRS is a powerful tool for probing the complex local organization and multipolar characteristics of ionic liquids.
  • The findings provide insights into the structure-property relationships of ionic liquids, relevant for their design and application.