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Conversión hacia arriba de fotones homomoleculares en un complejo de hierro decorado con perileno
Florian Doettinger1, Jonathan Sagaya1, Giacomo Morselli1
1Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland.
Journal of the American Chemical Society
|November 8, 2025
Resumen
Este estudio introduce la conversión homomolecular utilizando una sola molécula, FePer, que combina las funciones de sensibilizador y aniquilador. Este avance ofrece una nueva vía para la conversión eficiente de fotones con aplicaciones potenciales en materiales avanzados.
Área de la Ciencia:
- Fotoquímica y fotofísica
- Ciencias de los materiales
- Química supramolecular
Sus antecedentes:
- La conversión ascendente clásica de fotones se basa en sistemas heteromoleculares con moléculas sensibilizadoras y aniquiladoras separadas.
- La conversión homomolecular, donde una sola molécula realiza ambas funciones, es altamente deseable pero poco explorada.
- Los complejos de metales de transición de primera fila ofrecen propiedades fotofísicas únicas para nuevas estrategias de conversión ascendente.
Objetivo del estudio:
- Desarrollar y caracterizar un nuevo sistema de conversión homomolecular.
- Investigar el mecanismo de la conversión hacia arriba en un contexto unimolecular.
- Explorar el potencial de los complejos de hierro (III) en la conversión ascendente de fotones.
Principales métodos:
- Síntesis de un compuesto molecular (FePer) que integra un complejo de carbenos Fe (III) y perileno.
- Análisis espectroscópico (absorción, emisión, mediciones durante la vida útil) para caracterizar los estados excitados.
- Estudios mecánicos que incluyen la luminiscencia dependiente de la concentración y la conversión al alza en matrices congeladas.
Principales resultados:
- El FePer demuestra una conversión eficiente de fotones homomoleculares a través de un mecanismo unimolecular.
- El sistema exhibe estados excitados fotoactivos distintos: perileno S1, Fe (III) 2LMCT y perileno T1.
- La transferencia inversa de energía entre los estados Fe (III) 2LMCT y perileno T1 impulsa la conversión al alza.
- La luminiscencia convertida hacia arriba muestra una dependencia de concentración lineal y opera en matrices congeladas, lo que indica un proceso unimolecular.
Conclusiones:
- El compuesto FePer logra con éxito la conversión hacia arriba de fotones homomoleculares, unificando las funciones de sensibilizador y aniquilador.
- Los hallazgos validan el potencial de los complejos metálicos de transición de primera fila con estados dobles para la conversión ascendente.
- Este trabajo abre nuevas vías para el diseño de materiales moleculares avanzados para aplicaciones de conversión de fotones.
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