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Transferencia de carga de ruptura de simetría en estructuras metálicas orgánicas
Sreehari Surendran Rajasree1, H Christopher Fry2, David J Gosztola2
1School of Chemical and Biomolecular Science, Southern Illinois University, 1245 Lincoln Drive, Carbondale, Illinois 62901, United States.
Journal of the American Chemical Society
|February 14, 2024
Resumen
La transferencia de carga de ruptura de simetría en marcos orgánicos metálicos basados en pireno (MOF) genera portadores de carga de larga vida. Esta plataforma MOF ofrece una fotosíntesis artificial eficiente para la conversión de energía luminosa.
Área de la Ciencia:
- Ciencias de los materiales
- La fotoquímica
- Nanotecnología
Sus antecedentes:
- La recolección eficiente de luz requiere una generación de portadores de carga de alto rendimiento.
- Los sistemas de donante-aceptor molecular a menudo tienen un potencial de portador limitado debido a la fuerza impulsora de transferencia de carga.
- Las estructuras metálicas orgánicas (MOF) ofrecen una plataforma ajustable para procesos basados en la luz.
Objetivo del estudio:
- Investigar la transferencia de carga de ruptura de simetría (SBCT) en un MOF basado en pireno (NU-1000).
- Comprender el papel de los estados excitónicos en la SBCT.
- Para explorar los MOF como una plataforma para la fotosíntesis artificial.
Principales métodos:
- Espectroscopia ultrarrápida y transitoria en una escala de tiempo de 200 fs-30 μs.
- Circonio utilizado a base de pireno MOF NU-1000.
- Estudió la transferencia de carga en disolventes polares y de baja polaridad.
Principales resultados:
- SBCT observado en NU-1000, generando iones radicales en disolventes polares y estados de transferencia de carga en disolventes de baja polaridad.
- Se han identificado estados excitónicos no de Frank-Condon como intermedios en la SBCT.
- Las tasas cuantificadas de SBCT y recombinación de carga en diferentes polaridades del disolvente.
Conclusiones:
- SBCT en MOF permite la generación eficiente de portadores de carga de larga vida con potenciales maximizados.
- NU-1000 demuestra el potencial como una plataforma heterogénea para la conversión de energía fotónica artificial.
- El estudio pone de relieve la importancia de los estados excitónicos en la fotofísica MOF.
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