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Videos de Conceptos Relacionados

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.
Formation of Complex Ions03:45

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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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

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 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...
Electrochemical Systems01:24

Electrochemical Systems

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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Fases líquidas iónicas redox: imidazolios ferrocenizados.

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
PubMed
Resumen

Los investigadores sintetizaron nuevos líquidos iónicos electroactivos para estudiar el transporte de carga en medios redox. Estas sales de imidazolio funcionalizadas con ferroceno permiten nuevas investigaciones sobre las propiedades de las sales fundidas.

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Área de la Ciencia:

  • La electroquímica es electroquímica.
  • Ciencia de los materiales Ciencia de los materiales.
  • Química orgánica es la química orgánica.

Sus antecedentes:

  • Los líquidos iónicos son solventes versátiles con propiedades ajustables.
  • Comprender el transporte de carga en medios redox es crucial para las aplicaciones de almacenamiento de energía.
  • Los medios redox semisólidos ofrecen ventajas sobre los electrolitos líquidos tradicionales.

Objetivo del estudio:

  • Para sintetizar nuevos líquidos iónicos de N-alquilo imidazolio intrínsecamente electroactivos.
  • Para investigar los fenómenos de transporte de carga en medios redox semisólidos no diluidos.
  • Desarrollar un enfoque general para el diseño de sales fundidas a base de imidazolio.

Principales métodos:

  • Síntesis de líquidos iónicos de N-alquilo imidazolio funcionalizados con ferroceno.
  • Variaciones estructurales de la unión del ferroceno al núcleo del imidazolio.
  • Caracterización electroquímica utilizando voltametría cíclica.

Principales resultados:

  • Síntesis exitosa de nuevos líquidos iónicos electroactivos.
  • Demostración del ferroceno como un sitio redox adecuado.
  • Datos electroquímicos preliminares para el sistema de sales fundidas.

Conclusiones:

  • Los líquidos iónicos desarrollados son adecuados para estudiar el transporte de cargas.
  • La estrategia sintética es adaptable para varias sales fundidas a base de imidazolio.
  • Se justifican más investigaciones electroquímicas.