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Related Concept Videos

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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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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.
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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...
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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Complex formation between polyelectrolytes and oppositely charged oligoelectrolytes.

Jiajia Zhou1, Matthias Barz2, Friederike Schmid3

  • 1School of Chemistry & Environment, Center of Soft Matter Physics and Its Applications, Beihang University, Xueyuan Road 37, Beijing 100191, China.

The Journal of Chemical Physics
|May 2, 2016
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Summary

Computer simulations reveal how polyanion chains interact with oligocations. Polyanion chain conformation changes from extended to collapsed with increasing oligocation concentration, driven by ion release.

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Area of Science:

  • Polymer Physics
  • Computational Chemistry
  • Materials Science

Background:

  • Understanding polyelectrolyte complex formation is crucial for designing advanced materials.
  • The behavior of long polyanion chains interacting with multiple short oligocations is not fully understood.

Purpose of the Study:

  • To investigate the complex formation between a single polyanion chain and multiple oligocation chains using computer simulations.
  • To analyze the impact of oligocation concentration and length on the polyanion chain conformation and complex structure.

Main Methods:

  • Utilized a coarse-grained bead-spring model for polyelectrolyte chains.
  • Explicitly modeled small salt ions and varied oligocation concentration and length.
  • Analyzed chain conformation, static structure factor, and radial/axial distribution of charged species.

Main Results:

  • Polyanion chains transition from extended to collapsed structures with increasing oligocation concentration.
  • Complexes exhibit net negative, neutral, or positive charges depending on ion concentrations.
  • Complex behavior is largely independent of oligocation length, similar to multivalent salt interactions.

Conclusions:

  • The primary driving force for complex formation is the release of monovalent counterions and coions.
  • Findings have implications for controlled oligolyte release and substitution strategies.
  • Oligocation length has minimal impact on complex structure and behavior.