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Complexometric Titration: Ligands00:43

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Metal-Ligand Bonds02:51

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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.
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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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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Ligandos selectivos de cromo (VI) identificados mediante el uso de bibliotecas combinatorias de peptoides.

Abigail S Knight1, Effie Y Zhou, Jeffrey G Pelton

  • 1Department of Chemistry, University of California , 724 Latimer Hall, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|November 8, 2013
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron nuevos ligandos basados en peptoides para capturar selectivamente el cromo hexavalente tóxico [Cr(VI] del agua. Estos ligandos ofrecen una solución rentable para remediar la contaminación por Cr (VI) en muestras de agua ambiental.

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Área de la Ciencia:

  • Química del medio ambiente Química del medio ambiente
  • Ciencia de los materiales Ciencia de los materiales.
  • Biotecnología La biotecnología es la biotecnología.

Sus antecedentes:

  • El cromo hexavalente [Cr(VI] es un contaminante generalizado del agua en todo el mundo.
  • Las actuales estrategias de remediación para el cromo (VI) carecen de rentabilidad y eficiencia.
  • Un desafío clave es la ausencia de ligandos selectivos capaces de unirse al Cr (VI) en medio de numerosos otros iones en soluciones acuosas.

Objetivo del estudio:

  • Diseñar y aplicar una biblioteca basada en peptoides de ligandos candidatos para la unión selectiva de Cr (VI).
  • Identificar y caracterizar secuencias peptoideas con alta afinidad y especificidad para Cr (VI) a pH neutro.
  • Evaluar la eficacia de estos ligandos peptoideos en la remediación de muestras de agua ambiental contaminadas con Cr (VI).

Principales métodos:

  • Se sintetizó una biblioteca de secuencias peptoideas y se examinó para la unión de Cr (VI).
  • Se utilizó la espectroscopia UV-vis para las titulaciones de afinidad de las secuencias identificadas.
  • Se empleó la espectroscopia de RMN para la caracterización detallada de los complejos de Cr (VI) -ligando.
  • Las secuencias de peptoides fueron inmovilizadas en resinas de fase sólida para experimentos de remediación.

Principales resultados:

  • Se identificaron once secuencias peptoideas capaces de unirse al Cr (VI) en condiciones difíciles (pH neutro, exceso de iones).
  • Las comparaciones de afinidad revelaron capacidades de unión significativas entre las secuencias seleccionadas.
  • La caracterización aclaró las interacciones de coordinación y los determinantes de especificidad.
  • Las resinas peptoideas sintetizadas redujeron efectivamente los niveles de Cr (VI) en muestras de agua contaminada simuladas a rangos compatibles con la EPA.

Conclusiones:

  • Los ligandos basados en peptóides representan una nueva clase prometedora de quelantes selectivos para iones metálicos tóxicos como el CrVI.
  • Estos ligandos ofrecen un enfoque rentable y eficiente para la remediación ambiental de la contaminación por cromo.
  • El estudio destaca el potencial de las secuencias de peptoides como componentes versátiles para el desarrollo de materiales avanzados de remediación ambiental.