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Related Concept Videos

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.
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Formation of Complex Ions

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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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Ion Exchange01:17

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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 basic...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Redox ionic liquid phases: ferrocenated imidazoliums.

Ramjee Balasubramanian1, Wei Wang, Royce W Murray

  • 1Kenan Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.

Journal of the American Chemical Society
|August 3, 2006
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Summary

Researchers synthesized novel electroactive ionic liquids for studying charge transport in redox media. These ferrocene-functionalized imidazolium salts enable new investigations into molten salt properties.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Ionic liquids are versatile solvents with tunable properties.
  • Understanding charge transport in redox media is crucial for energy storage applications.
  • Semisolid redox media offer advantages over traditional liquid electrolytes.

Purpose of the Study:

  • To synthesize novel intrinsically electroactive N-alkyl imidazolium ionic liquids.
  • To investigate charge transport phenomena in undiluted semisolid redox media.
  • To develop a general approach for designing imidazolium-based molten salts.

Main Methods:

  • Synthesis of N-alkyl imidazolium ionic liquids functionalized with ferrocene.
  • Structural variations of ferrocene attachment to the imidazolium core.
  • Electrochemical characterization using cyclic voltammetry.

Main Results:

  • Successful synthesis of new electroactive ionic liquids.
  • Demonstration of ferrocene as a suitable redox site.
  • Preliminary electrochemical data for the molten salt system.

Conclusions:

  • The developed ionic liquids are suitable for studying charge transport.
  • The synthetic strategy is adaptable for various imidazolium-based molten salts.
  • Further electrochemical investigations are warranted.