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Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
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A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. 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...
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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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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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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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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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El amortiguamiento supramolecular por competencia de cadena de anillo.

Tim F E Paffen1, Gianfranco Ercolani, Tom F A de Greef

  • 1Institute for Complex Molecular Systems, ‡Laboratory of Macromolecular and Organic Chemistry, and §Computational Biology, Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Journal of the American Chemical Society
|January 13, 2015
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio revela el amortiguamiento supramolecular, donde las moléculas actúan como paradores de cadena en los equilibrios de anillo-cadena, permitiendo la actividad catalítica independiente de la concentración. Este mecanismo mejora la robustez del catalizador y amplía los rangos de concentración de funcionamiento.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • La catálisis de la catálisis.
  • Química Física es la química física.

Sus antecedentes:

  • Los sistemas organocatalíticos pueden lograr una actividad independiente de la concentración a través de interacciones supramoleculares.
  • El amortiguamiento supramolecular estabiliza los catalizadores moleculares, mejorando su robustez.

Objetivo del estudio:

  • Para aclarar los principios de diseño del amortiguamiento supramolecular a través de la competencia de la cadena de anillos.
  • Para investigar la influencia de los parámetros termodinámicos en este mecanismo de amortiguación.
  • Para comparar el amortiguamiento supramolecular con el amortiguamiento tradicional del pH y la titulación molecular.

Principales métodos:

  • Se emplearon enfoques experimentales y teóricos combinados.
  • Análisis de los equilibrios de la cadena de anillo supramolecular.
  • Medición de las constantes de equilibrio y los parámetros termodinámicos.

Principales resultados:

  • El amortiguamiento supramolecular ocurre cuando las moléculas actúan como paradores de cadena en equilibrios de cadena-anillo.
  • La molaridad efectiva es clave para optimizar el rango de concentración de amortiguación y la concentración máxima de moléculas amortiguadas.
  • Las predicciones del modelo se alinean con los datos experimentales en varios sistemas moleculares.

Conclusiones:

  • El amortiguamiento supramolecular ofrece un nuevo mecanismo para lograr una catálisis independiente de la concentración.
  • La comprensión de los equilibrios de la cadena de anillos es crucial para el diseño de sistemas catalíticos robustos.
  • Este trabajo proporciona una perspectiva comparativa de las diferentes estrategias de amortiguación.