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La transferencia de carga intramolecular mediada por alivio de antiaromaticidad permite una emisión radical eficiente

Yuhang Gao¹, Lu Tang¹, You-Jun Yu¹

¹State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Qianjin Avenue, Changchun 130012, P. R. China.

Journal of the American Chemical Society

|February 2, 2026

Resumen

Se sintetizaron nuevos radicales neutros luminiscentes basados en la fracción tris(2,4,6-triclorofenil) metilo (TTM). Estos radicales donante-aceptante (D-A•) exhiben una mayor eficiencia luminiscente y fotostabilidad en disolventes polares, superando las limitaciones anteriores.

Área de la Ciencia:

La electrónica orgánica es la electrónica orgánica.
Ciencia de los materiales ciencia de los materiales.
La fotoquímica es la fotoquímica.

Sus antecedentes:

Los radicales trifenilmetil (tritilo) son prometedores para la optoelectrónica y la espintrónica.
Los diseños de tritilo existentes están limitados por la escasa luminiscencia y fotostabilidad en disolventes polares debido a la simetría alternante.
Los sistemas de transferencia de carga intramolecular de radicales donantes se han utilizado para abordar la simetría, pero resultan en una mala emisión.

Objetivo del estudio:

Para sintetizar nuevos radicales neutros de donante-aceptor (D-A•) con propiedades luminiscentes mejoradas.
Para investigar las relaciones estructura-propiedad de estos radicales en disolventes polares.
Explorar nuevas estrategias para el diseño de radicales luminiscentes para aplicaciones avanzadas.

Principales métodos:

Síntesis de nuevos radicales neutros de donante-aceptor (D-A•) utilizando el radical tris(2,4,6-triclorofenil) metilo (TTM) y un grupo donante de 9H-tribenzo[b,d,f]azepina (TBA).
Caracterización fotofísica, incluidas las mediciones de eficiencia luminiscente y fotostabilidad en disolventes polares.
Espectroscopia de absorción transitoria (TA) para estudiar la dinámica del estado excitado y los procesos de transferencia de carga.

Principales resultados:

Los radicales D-A• sintetizados basados en TBA exhiben una eficiencia luminiscente superior (56% en acetonitrilo) y fotostabilidad (t1/2 = 4.3 × 10^5 s) en comparación con los radicales TTM anteriores.
Los espectros de absorción transitorios muestran una transformación eficiente a un estado de resonancia zwitteriónica de transferencia de carga intramolecular (ICT) en cuestión de picosegundos.
Los canales de desintegración no radiativos se suprimen debido al carácter de resonancia zwitteriónica ICT, atribuido al alivio de la antiaromaticidad.

Conclusiones:

Los nuevos radicales D-A• basados en TBA ofrecen una plataforma prometedora para materiales luminiscentes en la electrónica orgánica.
El estudio proporciona información sobre el control de la dinámica de estado excitado y la mejora de la fotostabilidad en sistemas radicales.
Este trabajo destaca la importancia del alivio de la antiaromaticidad en el diseño de radicales luminiscentes eficientes para aplicaciones de disolventes polares.

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