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Los difeniletenos espiro-funcionalizados: la supresión de una fotociclización reversible contribuye al efecto de

Zhibiao Zhou¹, Sheng Xie², Xian Chen¹

¹State Key Laboratory of Chemo/Biosensing and Chemometrics, Center for Aggregation-Induced Emission, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , China.

Journal of the American Chemical Society

|June 18, 2019

Resumen

Los investigadores desarrollaron nuevos materiales fluorescentes de color azul profundo con altos rendimientos cuánticos en estado sólido. Descubrieron un proceso de fotociclización crucial para el mecanismo de emisión inducido por la agregación, que ofrece ideas para diseñar materiales fluorescentes avanzados.

Área de la Ciencia:

Ciencias de los materiales
La fotoquímica
Productos electrónicos orgánicos

Sus antecedentes:

Los materiales de emisión inducida por agregación (AIE) son cruciales para las aplicaciones ópticas avanzadas.
La fracción de difenileno (DPE) es común en los materiales AIE, que exhiben comportamientos fotofísicos y fotoquímicos complejos.
Comprender estos comportamientos es clave para diseñar materiales fluorescentes de alto rendimiento.

Objetivo del estudio:

Desarrollar nuevos materiales emisores de color azul profundo con alto rendimiento cuántico de fluorescencia en estado sólido.
Investigar las actividades fotofísicas y fotoquímicas del DPE dentro de un andamio rígido.
Aclarar el mecanismo detrás de la emisión inducida por la agregación en estos nuevos materiales.

Principales métodos:

Se han sintetizado nuevos materiales que emiten un azul profundo mediante la fusión de un DPE flexible con un andamio de espiro rígido.
Materiales caracterizados para el rendimiento cuántico fluorescente en estado sólido (Φ_F).
Se han estudiado los fenómenos de fotociclización (PC) y su impacto en la EIA mediante técnicas espectroscópicas y análisis estructural.

Principales resultados:

Logró una nueva clase de materiales de color azul profundo con un estado sólido de Φ_F de hasta el 99,8%.
Se identificó una fotociclización reversible (PC) en la porción de DPE, que exhibe un cromismo visible.
Se ha demostrado que la PC se bloquea por agregación pero es prevalente en las soluciones, desempeñando un papel clave en el mecanismo de restricción de movimientos intramoleculares (RIM).

Conclusiones:

Los materiales desarrollados exhiben una excelente emisión azul profundo y altos rendimientos cuánticos en estado sólido.
La fotociclización (PC) es un factor crítico que influye en las propiedades de emisión inducida por agregación (EIA) de estos materiales a base de DPE.
El control de PC ofrece una vía para ajustar la fluorescencia y las características de AIE, guiando el diseño de materiales futuros.

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