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Probeando las interacciones donante-aceptor y los cambios co-conformacionales en las catenanas redox activas

Dennis Cao¹, Matteo Amelia, Liana M Klivansky

¹The Molecular Foundry, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, USA.

Journal of the American Chemical Society

|January 2, 2010

Resumen

Los investigadores sintetizaron nuevos donantes-aceptores desimetrizados [2] catenanos. Estas máquinas moleculares exhiben propiedades electrónicas y ópticas sintonizables, lo que permite aplicaciones potenciales en electrónica molecular y dispositivos mecánicos.

Área de la Ciencia:

Química supramolecular de las moléculas.
Ciencia de los materiales Ciencia de los materiales.
Ingeniería Molecular Ingeniería Molecular

Sus antecedentes:

Las catenanas donante-aceptora [2] son estructuras supramoleculares con aplicaciones potenciales en dispositivos moleculares.
Lograr un control preciso sobre la disposición de las diferentes unidades donantes y aceptantes dentro de las catenanas es un desafío.

Objetivo del estudio:

Para sintetizar y caracterizar las cadenas donante-aceptor desimetrizadas [2] con distintas unidades de donante y aceptor.
Investigar la selectividad traslacional, el comportamiento conformacional y las propiedades electrónicas de estos nuevos catenanos.
Explorar el potencial de estos catenanos para aplicaciones en electrónica molecular y máquinas mecánicas.

Principales métodos:

Síntesis de donante-aceptor desimetrizado [2] catenanos.
Cristalografía de rayos X para el análisis estructural en estado sólido.
(1) Espectroscopia de RMN H y electroquímica para la caracterización del estado de solución.
Experimentos voltamétricos y espectroelectroquímicos para estudiar propiedades electrónicas y ópticas.

Principales resultados:

Síntesis y caracterización exitosas de catenanos desimetrizados [2] con selectividad traslacional mantenida.
Coconformación dominada por fuertes interacciones donante-aceptante, que influyen en las propiedades visibles de absorción.
Cambio reversible entre hasta siete estados electrónicos y ópticos distintos mediante estimulación electroquímica.
Observación de la circunrotación del anillo en algunos compuestos después de la oxidación o reducción.

Conclusiones:

Las catenanas donante-aceptor desimetrizadas [2] ofrecen un notable control sobre la arquitectura y las propiedades moleculares.
Estos catenanos exhiben características electrónicas y ópticas sintonizables, lo que los hace prometedores para dispositivos moleculares avanzados.
Las funcionalidades de conmutación y circunrotación observadas destacan su potencial para la electrónica molecular y los sistemas mecánicos a nanoescala.

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