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Regulaciones conformacionales sinérgicas en los estados de tierra y excitados para realizar la fosforescencia de

Zhu Chen¹, Xiaojie Chen¹, Dongyu Ma¹

¹PCFM Lab, GD HPPC Lab, Guangdong Engineering Technology Research Center for High Performance Organic and Polymer Photoelectric Functional Films, State Key Laboratory of Optoelectronic Material and Technologies, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China.

Journal of the American Chemical Society

|July 20, 2023

Resumen

Los investigadores desarrollaron moléculas dependientes de la conformación, DMBZ y DBBZ, para la fosforescencia ajustable a temperatura ambiente (RTP). DBBZ exhibe múltiples estados emisores y comportamientos de respuesta al estímulo, lo que permite pantallas multicolores y aplicaciones de detección.

Área de la Ciencia:

Ciencias de los materiales
La fotoquímica
Química orgánica

Sus antecedentes:

La conformación molecular influye significativamente en las propiedades fotofísicas de los materiales.
El logro de estados de emisión sintonizables y múltiples en los materiales de fosforescencia a temperatura ambiente (RTP) es un desafío clave.
Comprender las relaciones estructura-propiedad es vital para el diseño de materiales luminiscentes avanzados.

Objetivo del estudio:

Investigar el impacto de la conformación molecular en las emisiones de RTP en los derivados del bencilo.
Demostrar la realización de RTP receptivo al estímulo y de ajuste amplio a través de la regulación conformacional.
Explorar las aplicaciones potenciales de estos materiales en detección y visualización.

Principales métodos:

Síntesis del 4,4'-dimetilbencilo (DMBZ) y el 4,4'-di-tercibutilbencilo (DBBZ).
Investigación de las propiedades de luminiscencia y RTP dependientes de la conformación.
Aplicación de estímulos externos (luz, fuerza, calor, fumigación) para inducir cambios de conformación y observar variaciones de RTP.
Análisis de las transiciones de fase y la regulación de la conformación del estado excitado en DBBZ.

Principales resultados:

DMBZ y DBBZ exhiben luminiscencia y RTP dependientes de la conformación.
Se observaron variaciones de RTP sensibles al estímulo tras la exposición a la luz, la fuerza, el calor y la fumigación.
DBBZ muestra múltiples cambios conformacionales en los estados básicos y excitados, lo que lleva a múltiples estados emisores y comportamientos únicos de respuesta al estímulo.
La DBBZ sufre transiciones de fase con cambios asociados de fosforescencia, lo que demuestra una regulación efectiva de la conformación en estado excitado.
El ajuste RTP de amplio alcance (cian, verde, amarillo) se logró en sistemas basados en DBBZ.

Conclusiones:

La regulación conformacional sinérgica en los estados de tierra y excitado permite emisiones RTP sensibles al estímulo y de ajuste amplio.
Los múltiples estados emisores y las propiedades de respuesta al estímulo de DBBZ ofrecen potencial para la detección de temperatura, pantallas multicolores y encriptación de información.
Estos hallazgos proporcionan información sobre la dinámica conformacional en estados agregados y la relación entre la conformación molecular, la RTP y la capacidad de respuesta al estímulo.

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