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Related Concept Videos

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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...
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Intermolecular Forces

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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...
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Ionic Association01:28

Ionic Association

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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.
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Common Ion Effect03:24

Common Ion Effect

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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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Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

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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...
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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Anomalous Wien Effects in Supercooled Ionic Liquids.

L N Patro1, O Burghaus1, B Roling1

  • 1Department of Chemistry, Philipps University of Marburg, Marburg, 35032, Germany.

Physical Review Letters
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PubMed
Summary

Supercooled ionic liquids exhibit anomalous Wien effects under high electric fields. Their conductivity nonlinearity surpasses classical electrolytes, suggesting new theoretical models are needed beyond lattice gas approximations.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Ionic liquids (ILs) are molten salts with unique properties.
  • Supercooled ILs maintain liquid states below their freezing points.
  • Nonlinear electrochemistry probes charge transport under extreme conditions.

Purpose of the Study:

  • Investigate nonlinear conductivity in supercooled ionic liquids.
  • Characterize anomalous Wien effects.
  • Compare IL behavior to classical electrolytes.

Main Methods:

  • Measured conductivity spectra under high AC electric fields (up to 180 kV/cm).
  • Detected higher harmonic AC currents (up to 7th order).
  • Analyzed conductivity-viscosity relationships.

Main Results:

  • Observed anomalous Wien effects in supercooled ionic liquids.
  • Most ILs showed strong conductivity nonlinearity, exceeding classical electrolytes.
  • [P6,6,6,14][Cl] exhibited ion association and quadratic field-dependent nonlinearity, similar to weak electrolytes.

Conclusions:

  • Supercooled ionic liquids display unique nonlinear electrical properties.
  • Existing models may not fully capture these phenomena.
  • Further theoretical development beyond Coulomb lattice gas models is required.