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Giovanni Bressan¹, Denis Hartmann², Jonathan Brouwer¹

¹School of Chemistry, University of East Anglia Norwich NR4 7TJ UK g.bressan@uea.ac.uk.

Chemical science

|January 30, 2026

Resumen

Los dímeros flexibles de diimida de perileno (PDI) cambian entre conformaciones, controlando las vías del estado excitado. Esta estrategia de conmutación supramolecular ajusta la dinámica de los éxcimeros y los multiexcitones para materiales optoelectrónicos avanzados.

Área de la Ciencia:

Química supramolecular
Fotoquímica
Ciencia de materiales

Sus antecedentes:

El control de las vías del estado excitado en ensamblajes de cromóforos es crucial para la próxima generación de materiales optoelectrónicos y fotónicos.
Los cromóforos orgánicos flexibles ofrecen potencial para el control dinámico de las propiedades del material.

Objetivo del estudio:

Elucidar la fotofísica dependiente de la conformación de un dímero flexible de diimida de perileno (PDI), valPDI₂.
Investigar el cambio impulsado por disolvente entre distintas geometrías de dímeros y su efecto en la dinámica del estado excitado.

Principales métodos:

Cálculos de acoplamiento de excitones
Espectroscopia ultrarrápida
Espectroscopia electrónica 2D de banda media

Principales resultados:

El dímero valPDI₂ cambia entre conformaciones abiertas (cloroformo) y apiladas cofaciales (DMSO/agua).
El confórmero abierto exhibe una lenta formación de éxcimeros, mientras que el confórmero apilado muestra una formación rápida y sin barreras de éxcimeros y multiexcitones.
Se observaron coherencias vibracionales dependientes de la conformación, que influyen en la formación de éxcimeros.

Conclusiones:

El control conformacional impulsado por el entorno es una poderosa estrategia no covalente para modular la dinámica de éxcimeros y multiexcitones en ensamblajes de PDI.
La conmutación supramolecular en arreglos de cromóforos flexibles es un principio general para ajustar el comportamiento del estado excitado.
Este enfoque tiene implicaciones para el desarrollo de materiales optoelectrónicos y de conversión de energía sensibles.

Palabras clave:

dímeros de diimida de perileno conmutación supramolecular dinámica de estado excitado espectroscopia ultrarrápida materiales optoelectrónicos

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