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Synthesis and Characterization of Functionalized Metal-organic Frameworks

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Una transición de fase reversible de preservación de la cristalinidad en estructuras orgánicas metálicas:

Dahuan Liu¹, Tian-Fu Liu, Ying-Pin Chen

¹‡State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.

Journal of the American Chemical Society

|May 27, 2015

Resumen

Un nuevo marco metal-orgánico (MOF), PCN-526, exhibe una transición de fase reversible de un solo cristal a un solo cristal (SC-SC) provocada por el enfriamiento. Esta transformación ofrece una nueva plataforma para el diseño de materiales MOF luminiscentes sensibles.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
La cristalografía es una técnica de cristalografía.
Química Química es la química.

Sus antecedentes:

Las transiciones de fase de cristal único a cristal único (SC-SC) son comunes en las estructuras metal-orgánicas (MOF).
Los estudios anteriores a menudo describen cambios estructurales, pero carecen de una comprensión mecanicista de estas transformaciones.
Los marcos metálico-orgánicos ofrecen propiedades sintonizables para aplicaciones de materiales avanzados.

Objetivo del estudio:

Descubrir y caracterizar una transición de fase SC-SC reversible desencadenada por el apagado en el MOF PCN-526.6.
Para investigar el mecanismo subyacente a la transición de fase observada.
Para explorar el potencial de PCN-526 como una plataforma para materiales luminiscentes sensibles.

Principales métodos:

Síntesis y caracterización del marco metálico-orgánico PCN-526.6.
Monitoreo in situ de las transiciones de fase utilizando difracción de rayos X.
Modificación de iones metálicos extra-marco para sondear los mecanismos de transición.
Encapsulación de moléculas luminiscentes invitadas para estudiar la modulación de la fotoluminiscencia.

Principales resultados:

Se observó una transición de fase SC-SC reversible en PCN-526 al enfriar, con distorsión del canal de cuadrado a rectangular mientras se mantenía la cristalinidad simple.
Se encontró que alterar la ocupación o las especies de iones metálicos extra-marco inhibe la transición de fase, proporcionando conocimientos mecanicistas.
PCN-526 demostró propiedades sintonizables de fotoluminiscencia tras la encapsulación de moléculas invitadas.
Se detectó luminiscencia sensible correlacionada con la transformación SC-SC.

Conclusiones:

El descubrimiento de la transición de fase SC-SC desencadenada por el enfriamiento en PCN-526 proporciona un nuevo mecanismo para las transformaciones MOF.
Comprender el papel de los iones metálicos extra-marco es crucial para controlar las transiciones de fase MOF.
PCN-526 sirve como una plataforma versátil para desarrollar nuevos materiales MOF luminiscentes con propiedades de respuesta a estímulos.

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