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Un estudio espectroscópico y computacional de tintes basados en donantes de carbazol y TPA y receptores basados en

Amir Sohail¹, Pawel Wagner², Joseph I Mapley¹

¹Department of Chemistry, University of Otago, Dunedin 9016, New Zealand.

The journal of physical chemistry. A

|August 27, 2025

Resumen

Este estudio investigó nuevos tintes donantes-aceptantes para aplicaciones potenciales. Los aceptores de malononitrilo presentan un carácter de transferencia de carga (TC) mejorado, con un comportamiento solvatocrómico distinto y sin agregación, validado por espectroscopia y DFT.

Área de la Ciencia:

Ciencias de los materiales
Química orgánica
Espectroscopia
Química computacional

Sus antecedentes:

Los tintes receptor-donante son cruciales para las aplicaciones optoelectrónicas.
Los andamios de tiofeno fundido (dctp) ofrecen propiedades electrónicas sintonizables.
La comprensión de la dinámica de transferencia de carga (CT) es clave para optimizar el rendimiento del tinte.

Objetivo del estudio:

Para sintetizar y caracterizar nuevos tintes donantes-aceptantes basados en un núcleo dctp.
Investigar la influencia de las diferentes unidades aceptoras (malononitrilo vs. indanediona) en las transiciones CT y las propiedades fotofísicas.
Para correlacionar los datos espectroscópicos experimentales con predicciones computacionales.

Principales métodos:

Síntesis de cuatro tintes donantes-aceptores que incluyen donantes de trifenilamina (TPA) o carbazol (Cbz) y aceptores basados en indano.
Análisis espectroscópicos que incluyen absorción, emisión y espectroscopia Raman de resonancia (RRS).
Modelado computacional utilizando la teoría funcional de densidad dependiente del tiempo (TD-DFT) y la teoría funcional de densidad (DFT).

Principales resultados:

Todos los tintes sintetizados exhibieron transiciones de transferencia de carga intramolecular (TC) en los espectros de absorción y emisión.
Los tintes que contienen malononitrilo mostraron un carácter CT mejorado en comparación con las contrapartes de indanediona.
Se observó un comportamiento solvatocrómico distinto, analizado a través de gráficos de Lippert-Mataga, McRae y Weller, lo que indica procesos de TC bien definidos.
Los cálculos de DFT confirmaron una planaridad significativa, y los espectros de RRS experimentales coincidieron con los calculados.

Conclusiones:

El estudio sintetizó y caracterizó con éxito nuevos tintes receptor-donantes basados en dctp.
Los aceptores de malononitrilo mejoran significativamente el carácter de la TC, lo que lleva a propiedades espectrales sintonizables.
Los tintes demuestran potencial para aplicaciones que requieren propiedades ópticas específicas y no presentan agregación a temperaturas variables.

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