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Transferencia de electrones fotoinducida en una tríada que puede ser montada/desmontada por dos diferentes entradas
Roberto Ballardini1, Vincenzo Balzani, Miguel Clemente-León
1Istituto FRAE-CNR, via Gobetti 101, 40129 Bologna, Italy.
Journal of the American Chemical Society
|October 24, 2002
Resumen
Los investigadores desarrollaron un cable de extensión molecular utilizando sistemas supramoleculares autoensambladores. Este sistema imita los cables de extensión eléctricos, con conexiones controlables para potenciales aplicaciones electrónicas a nanoescala.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- La electrónica molecular es la electrónica molecular.
- La fotoquímica es la fotoquímica.
Sus antecedentes:
- Los cables de extensión eléctricos macroscópicos son esenciales para la transmisión de energía.
- Imitar tales funciones a nivel molecular es un objetivo clave en la nanotecnología.
- Los sistemas de autoensamblaje ofrecen una ruta para construir arquitecturas moleculares complejas.
Objetivo del estudio:
- Diseñar y sintetizar un sistema supramolecular autoensamblador que funcione como un cable de extensión eléctrico molecular.
- Investigar las propiedades fotoquímicas, fotofísicas y electroquímicas del sistema y sus componentes.
- Para demostrar la conexión y desconexión controlables de los componentes moleculares.
Principales métodos:
- Síntesis de tres componentes supramoleculares clave: 12+, 2-H3+ y 3.
- Utilizando el éter de corona y las interacciones de pares de iones para el autoensamblaje.
- Utilizando espectroscopias de absorción y emisión de luz.
- Realización de mediciones electroquímicas (voltametría cíclica).
Principales resultados:
- Diseño y síntesis exitosos de un sistema supramolecular de tres componentes.
- Conexión/desconexión reversible demostrada de componentes controlados por estímulos ácido/base y redox.
- Se observó una transferencia eficiente de electrones fotoinducidos desde la unidad [Ru(bpy) 3 2+ a la unidad de bipiridinio en la tríada ensamblada.
Conclusiones:
- El sistema supramolecular desarrollado imita efectivamente un cable de extensión eléctrico molecular.
- El montaje y desmontaje controlables abren posibilidades para dispositivos moleculares sintonizables.
- Una mayor optimización podría conducir a la mejora de los cables de extensión eléctrica a nivel molecular.
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