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Conductividad electrónica, ordenamiento ferrimagnético e inserción reductora mediada por valencia orgánica mixta en

Lucy E Darago¹, Michael L Aubrey¹, Chung Jui Yu¹

¹Department of Chemistry, University of California , Berkeley, California 94720, United States.

Journal of the American Chemical Society

|November 18, 2015

Resumen

Este estudio demuestra un marco metálico orgánico (MOF) de alta conductividad con una conductividad de 0,16 S/cm, impulsado por la valencia mixta del ligando. Este hallazgo pone de relieve el potencial de los sistemas semicinoides de metal de transición para aplicaciones electrónicas avanzadas.

Área de la Ciencia:

Ciencias de los materiales
Química del estado sólido
Química de coordinación

Sus antecedentes:

Las estructuras metálicas orgánicas (MOF) son materiales cristalinos porosos con diversas aplicaciones.
El logro de una alta conductividad electrónica en los MOF sigue siendo un desafío importante.
La valencia mixta de ligandos es un mecanismo potencial para mejorar la conductividad en los MOF.

Objetivo del estudio:

Sintetizar y caracterizar un nuevo MOF basado en Fe (III) con alta conductividad electrónica.
Para aclarar el origen de la conductividad electrónica en este MOF.
Investigar el efecto de los estados redox del ligando en la conductividad y las propiedades magnéticas.

Principales métodos:

Síntesis de una red tridimensional de sólidos (NBu4) 2Fe (III) 2 (dhbq) 3.
Caracterización mediante reflexión difusa UV-NIR, voltametría cíclica y mediciones de conductividad a temperatura variable y susceptibilidad magnética.
Síntesis de un material marco reducido Na0.9 ((NBu4) 1.8Fe ((III) 2 ((dhbq) 3 para estudios comparativos.

Principales resultados:

El MOF exhibió una alta conductividad de 0,16 ± 0,01 S/cm a 298 K.
Se identificó la valencia mixta de ligandos como el origen de la conductividad electrónica.
Se informó de la primera observación de valencia mixta de clase II/III de Robin-Day en un MOF.
El control estequiométrico sobre los estados redox del ligando influyó en la conductividad y el ordenamiento magnético.

Conclusiones:

El sistema Fe ((III) semiquinoide MOF demuestra una conductividad electrónica excepcional.
La valencia mixta de ligandos es un factor clave para lograr una alta conductividad en los MOF.
Este andamio MOF es prometedor para la comunicación electrónica sintonizable de largo alcance.

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