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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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Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
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Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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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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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Alteración del exceso de cationes *CO Configuración intermedia y selectividad del producto de Cu en la reacción de

Suhwan Yoo1,2, Sejin Park1, Jihoon Son3

  • 1Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea.

Journal of the American Chemical Society
|April 2, 2025
PubMed
Resumen
Este resumen es generado por máquina.

El exceso de cationes como Cs + puede obstaculizar la reducción electroquímica de CO2 (CO2RR) al alterar la adsorción de CO en el cobre, favoreciendo la evolución del hidrógeno sobre los productos de C2 +. Los aglutinantes poliméricos pueden restaurar el rendimiento de la CO2RR.

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Área de la Ciencia:

  • La electroquímica
  • Ciencias de la superficie
  • Catálisis

Sus antecedentes:

  • La reducción electroquímica de CO2 (CO2RR) es crucial para la química sostenible.
  • Se sabe que la concentración de cationes influye en la selectividad de la CO2RR en medios ácidos.

Objetivo del estudio:

  • Investigar cómo el exceso de cationes afecta las configuraciones de adsorción de CO y la distribución del producto CO2RR.
  • Para aclarar el mecanismo detrás de los cambios inducidos por el catión en la selectividad de CO2RR.

Principales métodos:

  • Espectroscopia de absorción de infrarrojos con reflexión total atenuada por superficie (ATR-SEIRAS) para controlar la adsorción de CO.
  • Simulaciones de la teoría funcional de la densidad (DFT) para comprender las interacciones catión-CO.
  • Experimentos electroquímicos con diferentes concentraciones de cationes y enlaces poliméricos.

Principales resultados:

  • El aumento de la concentración de Cs + cambia la adsorción de CO de la parte superior a la configuración de puente en las superficies de Cu.
  • Las altas concentraciones de Cs+ promueven la reacción de evolución del hidrógeno (HER) y suprimen el acoplamiento C-C.
  • Los aglutinantes poliméricos en las superficies Cu restauran la selectividad de CO2RR evitando la interferencia catiónica.

Conclusiones:

  • La concentración de cationes tiene un impacto significativo en los intermediarios de adsorción de CO y en las vías de CO2RR.
  • La estabilización de CObridge por Cs + dificulta el acoplamiento C-C, favoreciendo a HER.
  • La modificación de la superficie del catalizador con aglutinantes poliméricos ofrece una estrategia para mitigar los efectos nocivos de los cationes y mejorar la RCO2.