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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...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
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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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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...
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

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Emisión única de las aleaciones de lantánidos a base de polímeros.

Raja Shunmugam1, Gregory N Tew

  • 1Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Amherst, Massachusetts 01003, USA.

Journal of the American Chemical Society
|September 30, 2005
PubMed
Resumen

Se sintetizaron nuevas macromoléculas con interacciones metal-ligando. Estos polímeros exhiben luminiscencia sintonizable, creando colores únicos y propiedades termocrómicas al incorporar iones lantánidos.

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Área de la Ciencia:

  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • Ciencia de los materiales Ciencia de los materiales.
  • Química supramolecular de las moléculas.

Sus antecedentes:

  • Las interacciones metal-ligando ofrecen propiedades únicas a las macromoléculas.
  • Las técnicas de polimerización controlada permiten un diseño macromolecular preciso.

Objetivo del estudio:

  • Para sintetizar nuevas macromoléculas con ésteres activados para la incorporación de terpiridina.
  • Investigar las propiedades luminiscentes y termocrómicas de los polímeros funcionalizados con lantánidos.

Principales métodos:

  • Síntesis de macromoléculas a través de la polimerización radical por transferencia atómica (ATRP).
  • Incorporación de los ligandos de terpiridina en la columna vertebral del polímero.
  • Funcionalización con iones de europio (Eu3+) y terbio (Tb3+).

Principales resultados:

  • Los polímeros funcionalizados con Eu3+ emitieron luz rosa; Tb3+ emitió luz verde.
  • La coincorporación de Eu3+ y Tb3+ en una proporción de 1:1 produjo luminiscencia amarilla.
  • Se observó termocromatismo selectivo, cambiando de amarillo a naranja / rosa por encima de 50 ° C.

Conclusiones:

  • Se sintetizaron con éxito nuevos polímeros funcionalizados con metales con luminiscencia ajustable.
  • La combinación de diferentes iones lantánidos permite la creación de materiales luminiscentes "aleados".
  • Estos materiales exhiben un comportamiento termocrómico sensible, lo que indica un potencial para aplicaciones ópticas avanzadas.