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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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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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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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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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Más allá de BODIPY: complejos de dipirrina de los elementos del bloque P

Isaac S Schomberg-Sanchez1, Wilmar A Janusz1, Christopher M Lemon1

  • 1Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT, USA.

Journal of coordination chemistry
|September 2, 2025
PubMed
Resumen

Los complejos de dipirrina de bloque p pesado son un área emergente de investigación con propiedades ópticas únicas. Estas dipirrinas del grupo principal son prometedoras en catálisis y aplicaciones biológicas, incluida la terapia fotodinámica y las imágenes tumorales.

Palabras clave:
Dipirrina y sus derivadosEstructura de rayos XImágenes biológicascatálisisde las emisionesgrupo principalBloqueo pTratamiento fotodinámico (TPD)

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Área de la Ciencia:

  • Química de coordinación
  • Grupo principal Química
  • Elementos del bloque P

Sus antecedentes:

  • Los ligandos de la dipirrina son versátiles, pero la química del grupo principal de la dipirrina, especialmente para los elementos pesados del bloque p, sigue siendo poco explorada.
  • Si bien los complejos de dipirina de boro (BODIPY) existen desde 1968, las dipirinas de bloque p pesadas bien caracterizadas son un desarrollo más reciente (2006).
  • La investigación en este campo ha aumentado recientemente, con casi la mitad de las publicaciones que han aparecido desde 2019.

Objetivo del estudio:

  • Proporcionar una revisión enfocada en los complejos de dipirrina de bloque p pesados.
  • Describir la síntesis, estructura y espectroscopia de estas moléculas.
  • Destacar su potencial en catálisis y aplicaciones biológicas.

Principales métodos:

  • Revisión de la literatura existente sobre los complejos de dipirina de bloque p pesado.
  • Análisis de métodos sintéticos, caracterización estructural y datos espectroscópicos.
  • Examen de las aplicaciones notificadas en catálisis y biología.

Principales resultados:

  • Los complejos de dipirrina de bloque p pesados exhiben propiedades ópticas significativas, emitiendo en regiones rojas e infrarrojas cercanas con altos rendimientos cuánticos.
  • Estos complejos han demostrado su utilidad como catalizadores.
  • Las aplicaciones en contextos biológicos incluyen terapia fotodinámica, imágenes de tumores y desarrollo de fármacos citotóxicos.

Conclusiones:

  • El rápido desarrollo y la accesibilidad sintética de los complejos de dipirina de bloque p pesados los posicionan para la integración con los avances en la química del grupo principal.
  • Estos nuevos complejos pueden ofrecer ventajas sobre las plataformas de ligandos existentes.
  • La exploración adicional de las dipirinas de bloque p pesado promete nuevas aplicaciones emocionantes.