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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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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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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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The human body utilizes protein buffer systems to maintain a stable pH. These systems capitalize on the dual role of amino acids, which can act as acids or bases by accepting or releasing hydrogen ions in response to pH changes. Protein buffer systems are particularly significant in the extracellular fluid (ECF) and intracellular fluid (ICF) of active cells, where structural and functional proteins provide substantial buffering capacity.
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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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Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).
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Un amortiguador de electrones acoplados a protones basado en un complejo de Cu mononuclear

Tong Wu1, Khashayar Rajabimoghadam2, Ankita Puri1

  • 1Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania15213, United States.

Journal of the American Chemical Society
|September 9, 2022
PubMed
Resumen

Este estudio introduce un nuevo sistema de amortiguador de protones acoplados a electrones 4H+/4e (ECPB) utilizando cobre y un ligando redox activo. Este sistema de ECPB cataliza efectivamente las reacciones de reducción de oxígeno y deshidrogenación de sustratos orgánicos.

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Área de la Ciencia:

  • Química inorgánica
  • La electroquímica
  • Catálisis

Sus antecedentes:

  • El desarrollo de sistemas eficientes de amortiguamiento de electrones acoplados a protones (ECPB) es crucial para las aplicaciones catalíticas.
  • Los complejos basados en cobre con ligandos redox activos ofrecen vías prometedoras para los procesos de transferencia de múltiples electrones.

Objetivo del estudio:

  • Diseñar y caracterizar un nuevo 4H+/4e- ECPB basado en cobre y un ligando redox activo.
  • Investigar la actividad catalítica del sistema ECPB en la reducción de oxígeno y la deshidrogenación del sustrato orgánico.
  • Aclarar las vías mecanicistas que rigen la función de la ECPB tanto en los modos de reacción acoplados como en los desacoplados.

Principales métodos:

  • Síntesis y caracterización de complejos de cobre mediante difracción de rayos X, espectroscopia 1H-NMR.
  • Estudios electroquímicos para sondear el comportamiento redox del sistema ECPB.
  • Cálculos de la Teoría Funcional de Densidad (DFT) para comprender las estructuras electrónicas y los mecanismos de reacción.

Principales resultados:

  • Se sintetizó y caracterizó con éxito un 4H+/4e-ECPB (complejos 1 y 5) basado en Cu (I) / Cu (II) y un ligando bis (urea) redox-activo.
  • El sistema ECPB demostró actividad catalítica para la reducción 4H+/4e- de O2 a H2O.
  • El sistema también catalizó la deshidrogenación de sustratos orgánicos en ambos modos acoplados y desacoplados.
  • Los estudios mecanicistas revelaron rápidas reacciones de desproporcionamiento que mantienen el equilibrio ECPB.

Conclusiones:

  • El sistema ECPB basado en Cu desarrollado proporciona una plataforma eficiente para mediar reacciones de transferencia de múltiples protones y múltiples electrones.
  • La capacidad del sistema para catalizar tanto la reducción de oxígeno como la deshidrogenación orgánica destaca su potencial en diversas aplicaciones catalíticas.
  • Las vías de reacción desacopladas y acopladas ofrecen un control ajustable sobre los procesos de oxidación y reducción.