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Autoensamblaje de ligandos puentes de perileno bisimida funcionalizados con ferroceno con esquina PtII a cuadrados
Chang-Cheng You1, Frank Würthner
1Institut für Organische Chemie, Universität Würzburg, Am Hubland, Germany.
Journal of the American Chemical Society
|August 9, 2003
Resumen
Los investigadores crearon nuevos cuadrados moleculares dendríticos multiredox activos utilizando ferroceno y platino. Estas estructuras exhiben propiedades electroquímicas únicas, pero los altos estados de oxidación conducen a la descomposición del ensamblaje debido a la repulsión.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Química organometálica Química orgánica de los metales.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Las bisimidas de perileno son cromóforos versátiles y bloques de construcción en la química supramolecular.
- Las unidades de ferroceno ofrecen una rica actividad redox, crucial para el desarrollo de materiales electroactivos.
- El autoensamblaje metalo-supramolecular permite la construcción de arquitecturas complejas y ordenadas.
Objetivo del estudio:
- Para sintetizar nuevos ligandos de perileno bisimida sustituidos por ferrocenilo.
- Para construir cuadrados moleculares dendríticos activos multiredox sin precedentes a través del autoensamblaje.
- Para investigar las propiedades electroquímicas y el comportamiento redox de estos cuadrados moleculares.
Principales métodos:
- Síntesis de ligandos de perileno bisimida a través de reacciones de acoplamiento.
- Autoensamblaje metalosupramolecular utilizando esquinas de platino ([Pt(dppp)][(OTf) 2)).
- Caracterización mediante RMN, espectroscopia UV/vis, análisis elemental, voltametría cíclica y espectroelectroquímica.
Principales resultados:
- Síntesis exitosa de ligandos de perileno bisimida sustituidos por ferrocenilo.
- Preparación de alto rendimiento de cuadrados moleculares dendríticos que contienen 16 grupos de ferroceno.
- Demostración de que la superestructura cuadrada influye en el comportamiento redox del ferroceno.
- La oxidación completa de los grupos de ferroceno es posible, pero conduce a la descomposición a través de la repulsión Coulombic.
Conclusiones:
- Se lograron nuevos cuadrados moleculares activos multiredox con amplia incorporación de ferroceno.
- El estudio destaca la interacción entre la arquitectura molecular y las propiedades electroquímicas.
- La repulsión coulombina en estados altamente oxidados limita la estabilidad de estos conjuntos supramoleculares.
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