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Un complejo de coordinación alostérico con conmutación redox

Ho Fung Cheng1, Andrea I d'Aquino1, Joaquín Barroso-Flores2

  • 1Department of Chemistry and International Institute for Nanotechnology , Northwestern University , 2145 Sheridan Road , Evanston , Illinois 60208-3113 , United States.

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|October 27, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo complejo de platino con un ligando con conmutación redox. Este sistema de pinza molecular permite el control electroquímico sobre los sitios de coordinación, creando cuatro estados distintos para aplicaciones avanzadas.

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Área de la Ciencia:

  • Química de coordinación
  • Química supramolecular
  • La electroquímica

Sus antecedentes:

  • El desarrollo de interruptores moleculares con propiedades sintonizables es crucial para los materiales avanzados.
  • Los ligandos con conmutación redox ofrecen una vía para el control dinámico de estructuras complejas metálicas.
  • El enfoque de enlace débil permite la síntesis de arquitecturas moleculares sofisticadas.

Objetivo del estudio:

  • Para sintetizar y caracterizar un complejo de pinza molecular regulado por redox.
  • Investigar la regulación alostérica de la accesibilidad del sitio de coordinación por agentes redox.
  • Explorar el control electroquímico sobre múltiples estados estructurales y electrónicos distintos.

Principales métodos:

  • Síntesis a través del enlace débil.
  • Caracterización mediante espectroscopia de RMN multinuclear, voltametría cíclica y espectroscopia UV frente a NIR.
  • Determinación estructural mediante cálculos de difracción de rayos X de un solo cristal (SCXRD) y teoría funcional de la densidad (DFT).

Principales resultados:

  • Síntesis exitosa de un complejo Pt(II) con un ligando hemilabil redóxido (RHL) con una fracción de ferrocenilo.
  • Demostración del cambio reversible entre un estado completamente cerrado y un estado semiabierto controlado por el estado de oxidación del ferroceno.
  • Identificación y caracterización de cuatro estados de coordinación distintos dentro del sistema, modulados por el potencial redox y la estructura.

Conclusiones:

  • El sistema basado en RHL proporciona un control electroquímico sin precedentes sobre la ocupación del sitio de coordinación.
  • Este trabajo establece un nuevo paradigma para el diseño de complejos de coordinación dinámica con múltiples estados conmutables.
  • Los hallazgos abren vías para materiales y dispositivos moleculares que responden a estímulos.