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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Actividades redox extraordinarias en moléculas conjugadas de tipo escalera habilitadas por la deslocalización y

Congzhi Zhu, Xiaozhou Ji, Di You

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

Journal of the American Chemical Society

|December 4, 2018

Resumen

Las nuevas moléculas orgánicas con enlaces boro-nitrógeno exhiben propiedades redox sintonizables y electrocrómicas multicolores. Estos compuestos muestran múltiples estados de oxidación estables y cambios de color reversibles, allanando el camino para materiales electrónicos avanzados.

Área de la Ciencia:

Química orgánica
Ciencias de los materiales
La electroquímica

Sus antecedentes:

La incorporación de enlaces boro-nitrógeno (B ← N) en sistemas π ofrece una nueva ruta para propiedades electrónicas y ópticas únicas en materiales orgánicos.
El desarrollo de moléculas con múltiples y distintos estados redox es crucial para aplicaciones en electrónica avanzada y almacenamiento de energía.

Objetivo del estudio:

Diseñar y sintetizar nuevos compuestos orgánicos con enlaces B ← N para un comportamiento redox y electrocrómico sintonizable.
Investigar los mecanismos redox fundamentales y las transformaciones estructurales en estos nuevos materiales.

Principales métodos:

Síntesis de moléculas de tipo escalera cruciforme (BN-F y BN-Ph) mediante borolación N-dirigida.
Caracterización electroquímica (espectoelectroquímica) para determinar los potenciales redox y la estabilidad.
Estudios computacionales y difracción de rayos X de un solo cristal para dilucidar los mecanismos redox y los cambios estructurales.

Principales resultados:

Síntesis exitosa de compuestos BN-F y BN-Ph con unidades de coordinación B ← N bien definidas.
Observación de dos procesos de transferencia de electrones reductivos y dos oxidativos distintos, que conducen a cinco estados de oxidación estables.
Demostración de electrocromismo multicolor con alta reversibilidad y cambios de color distintos entre los estados redox.
Identificación de un catión radical que contiene boro y las transformaciones estructurales quinonoides durante el ciclo redox.

Conclusiones:

El enlace de coordenadas B ← N es una estrategia efectiva para crear moléculas orgánicas con propiedades redox y electrocrómicas exóticas.
La estructura cruciforme diseñada permite un comportamiento redox robusto y reversible en múltiples etapas y un electrocromismo multicolor.
La coordinación B ← N mejora la deslocalización de carga / espín y modula las propiedades electrónicas a través de la hiperconjugación, crucial para la estabilidad y la función del material.

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