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Videos de Conceptos Relacionados

Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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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...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Un enfoque de solución sólida para estructuras metálico-orgánicas con conductividad redox ajustable

Gavin S Mohammad-Pour, Kendrich O Hatfield, David C Fairchild

    Journal of the American Chemical Society
    |December 3, 2019
    PubMed
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    Los investigadores desarrollaron electrodos de película delgada con conductividad sintonizable. Este avance permite un control preciso de la transferencia de carga para aplicaciones de energía y detección mejoradas.

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    Área de la Ciencia:

    • Ciencias de los materiales
    • La electroquímica
    • Nanotecnología

    Sus antecedentes:

    • Las estructuras metal-orgánicas (MOF) ofrecen porosidad ajustable y control sintético, pero sus aplicaciones electroquímicas están limitadas por la conductividad.
    • El ajuste sistemático de la conductividad de los MOF es crucial para integrar sus propiedades en las tecnologías de almacenamiento y detección de energía.
    • Los colgantes redox-activos pueden facilitar la transferencia de carga en los MOF, pero la integración controlada sigue siendo un desafío.

    Objetivo del estudio:

    • Introducir una estrategia novedosa para la preparación de electrodos de película delgada de MOF redox con contenido de suspensión redox controlado con precisión.
    • Investigar la relación entre la concentración de suspensión redox y la conductividad eléctrica resultante de los electrodos MOF.
    • Evaluar la estabilidad electroquímica y los mecanismos de transferencia de carga dentro de estos materiales MOF de ingeniería.

    Principales métodos:

    • Fabricación de electrodos de película delgada MOF utilizando un enfoque de solución sólida con proporciones variables de enlaces redox activos (alquilo-ferroceno) y inactivos.
    • Ajuste sistemático del contenido de suspensión redox durante la síntesis de MOF para controlar la conductividad.
    • Caracterización electroquímica, incluidas las mediciones de conductividad y las pruebas de estabilidad durante miles de ciclos redox.
    • Estudios electroanalíticos para elucidar los mecanismos de transferencia de carga (por ejemplo, difusión, salto, percolación).

    Principales resultados:

    • Se han preparado con éxito electrodos de película delgada MOF con conductividad redox ajustable.
    • Alcanzó una conductividad máxima de electrones de 1,10 mS m-1.
    • Demostró una excelente estabilidad cristalográfica y electroquímica durante miles de ciclos redox.
    • Comportamiento de conductividad controlado por difusión similar a la solución con coeficientes de difusión no lineales.

    Conclusiones:

    • La estrategia desarrollada permite ajustar la conductividad redox en los MOF a través de la incorporación controlada de colgantes redox.
    • Los electrodos MOF muestran una estabilidad robusta y una transferencia de carga consistente con los modelos de salto y percolación.
    • Este trabajo abre nuevas vías para diseñar MOFs redox-activos avanzados para dispositivos electroquímicos como baterías y sensores.