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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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 formed in...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Phase II Reactions: Miscellaneous Conjugation Reactions01:19

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Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...

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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Catalizador basado en cobre altamente activo para la polimerización radical de transferencia atómica.

Huadong Tang1, Navamoney Arulsamy, Maciej Radosz

  • 1Soft Materials Laboratory, Department of Chemical & Petroleum Engineering, University of Wyoming, Laramie, Wyoming 82071, USA.

Journal of the American Chemical Society
|December 15, 2006
PubMed
Resumen
Este resumen es generado por máquina.

Un nuevo catalizador de cobre-TPEN permite la polimerización radical de transferencia atómica (ATRP) altamente activa con concentraciones de catalizador significativamente reducidas. Este avance permite una síntesis bien controlada de polímeros utilizando un mínimo catalizador, avanzando las técnicas de polimerización.

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Área de la Ciencia:

  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • La catálisis de la catálisis.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • La polimerización radical por transferencia atómica (ATRP) generalmente requiere altas concentraciones de catalizadores (1000-10,000 ppm).
  • El desarrollo de catalizadores altamente activos es crucial para procesos de polimerización eficientes y económicos.

Objetivo del estudio:

  • Introducir un nuevo catalizador basado en cobre altamente activo para ATRP.
  • Para investigar el rendimiento del catalizador con varios monómeros y sus características estructurales.

Principales métodos:

  • Se utilizó el complejo de cobre ((I) bromuro/N,N,N',N'-tetráquido ((2-piridilmetil) etilenodiamina (CuBr/TPEN) como catalizador.
  • Se realizó ATRP con monómeros acrílicos, metacrílicos y estireno.
  • Caracterizó las estructuras del catalizador utilizando difracción de rayos X y espectroscopia de RMN.

Principales resultados:

  • Se logró una polimerización bien controlada con bajas polidispersidades a bajas relaciones catalizador/iniciador (0,005 y 0,001).
  • Se ha demostrado el éxito de ATRP con concentraciones de cobre tan bajas como 6-8 ppm.
  • Identificó el equilibrio entre los complejos de cobre binucleares y mononucleares en solución y el complejo desactivador mononuclear.

Conclusiones:

  • El complejo CuBr/TPEN es un catalizador versátil y altamente activo para ATRP.
  • La alta estabilidad del catalizador y las constantes de equilibrio adecuadas son clave para una catálisis eficiente, especialmente en condiciones diluidas.
  • Los hallazgos proporcionan una base para el diseño de catalizadores ATRP de próxima generación.