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Separación de cargas inducida por la luz en jaulas de coordinación de donante y receptor densamente empaquetadas
Marina Frank1, Jennifer Ahrens2, Isabel Bejenke1
1Institute for Inorganic Chemistry, Georg-August University Göttingen , Tammannstraße 4, 37077 Göttingen, Germany.
Journal of the American Chemical Society
|June 4, 2016
Resumen
La separación de carga impulsada por fotones se logró utilizando jaulas de coordinación autoensambladas. Las jaulas de ligandos mixtos permitieron una transferencia eficiente de electrones entre los componentes donantes y aceptores, allanando el camino para aplicaciones fotovoltaicas avanzadas.
Área de la Ciencia:
- Química supramolecular
- La fotoquímica
- Ciencias de los materiales
Sus antecedentes:
- La separación de cargas impulsada por fotones es crucial para una conversión de energía eficiente.
- Las arquitecturas supramoleculares ofrecen un control preciso sobre las interacciones moleculares.
- Las jaulas de coordinación proporcionan una plataforma versátil para la construcción de materiales funcionales.
Objetivo del estudio:
- Sintetizar y caracterizar las jaulas de coordinación autoensambladas para la separación de cargas accionada por fotones.
- Investigar la dinámica de transferencia de electrones en sistemas de ligandos mixtos frente a sistemas de jaula mixta.
- Explorar el potencial de estos conjuntos en futuras aplicaciones fotovoltaicas.
Principales métodos:
- Síntesis de jaulas de coordinación interpenetradas utilizando cationes Pd (II) y ligandos funcionales (fenotiazina y antraquinona).
- Análisis espectroscópico, incluida la espectroscopia UV de estado estacionario y de absorción transitoria.
- Caracterización electroquímica mediante la voltametría cíclica y la electroquímica espectral.
Principales resultados:
- Con éxito sintetizado homo-octameric y ligandos mixtos de doble jaula.
- Las jaulas de ligandos mixtos mostraron una transferencia de electrones fotoinducida eficiente entre las unidades donantes de fenotiazina (PTZ) y las aceptadoras de antraquinona (ANQ).
- Las mezclas de jaulas donantes y aceptantes separadas no mostraron transferencia significativa de electrones al momento de la excitación.
Conclusiones:
- La comunicación estrecha dentro del ensamblaje en jaulas de ligandos mixtos es esencial para una separación efectiva de cargas.
- Los autoensambladores redóxicos densamente empacados ofrecen control a nivel molecular para la ingeniería de dispositivos fotovoltaicos.
- Estos hallazgos ponen de relieve el potencial de la química supramolecular en el desarrollo de tecnologías de energía solar de próxima generación.
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