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Receptor multi-responsivo de ocho estados de bis ((acridinio-Zn ((II) porfirina)
Amy Edo-Osagie1, Dylan Serillon2, Federica Ruani3
1Laboratoire de Synthèse des Assemblages Moléculaires Multifonctionnels, Institut de Chimie de Strasbourg, CNRS/UMR 7177, 4, rue Blaise Pascal, 67000 Strasbourg, France.
Journal of the American Chemical Society
|May 8, 2023
Resumen
Los investigadores diseñaron un nuevo receptor multi-responsivo utilizando conjugados de acridinio-zinco. Este receptor exhibe ocho estados distintos y propiedades fotofísicas sintonizables, incluida la luminiscencia en el infrarrojo cercano, tras la unión del huésped y la modificación química.
Área de la Ciencia:
- Química supramolecular
- La fotoquímica
- Ciencias de los materiales
Sus antecedentes:
- El diseño de receptores moleculares con propiedades sintonizables es crucial para la detección química avanzada y los materiales sensibles.
- Las fracciones de acridinio y porfirina ofrecen características electrónicas y fotofísicas únicas para el reconocimiento molecular y la transducción de señales.
Objetivo del estudio:
- Diseñar y sintetizar un receptor multi-responsivo basado en conjugados de (acridinio-Zn(II) porfirina.
- Investigar la modulación de las propiedades fotofísicas y de unión del huésped mediante estímulos químicos y electrónicos.
- Explorar el potencial de la luminiscencia de transferencia de carga en la región del infrarrojo cercano.
Principales métodos:
- Síntesis de un receptor conjugado de bis ((acridinio-Zn ((II) porfirina).
- Estudios de titulación para determinar las constantes de unión con un huésped ditópico.
- Análisis espectroscópico (UV-Vis, fluorescencia) para controlar los cambios en las propiedades fotofísicas.
- Métodos electroquímicos para inducir la oxidación de unidades de porfirina y la adición nucleofílica a las fracciones de acridinio.
Principales resultados:
- El receptor demostró constantes de unión moduladas tras la adición de nucleófilos y la oxidación de unidades de porfirina.
- Se observó una cascada de ocho estados distintos debido al reconocimiento y a los eventos de respuesta.
- La conversión de acridinio/acridano alteró significativamente las propiedades fotofísicas, cambiando entre los procesos de transferencia de electrones y energía.
- El receptor de bis ((acridinio-Zn ((II) porfirina) exhibió luminiscencia de transferencia de carga en el espectro del infrarrojo cercano.
Conclusiones:
- El receptor diseñado exhibe una respuesta múltiple a estímulos químicos y electrónicos.
- El receptor permite propiedades fotofísicas sintonizables, incluido un interruptor en los mecanismos de transferencia de energía.
- La observación de la luminiscencia del infrarrojo cercano abre posibilidades para aplicaciones en detección e imágenes.
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