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Cuadros orgánicos covalentes 2D con enlaces de hidrógeno orientados a través de la no-planaridad diseñada

Sampath B Alahakoon, Kui Tan, Haardik Pandey¹

¹Department of Physics and Center for Functional Materials, Wake Forest University, 1834 Wake Forest Road, Winston-Salem, North Carolina 27109, United States.

Journal of the American Chemical Society

|July 7, 2020

Resumen

Los investigadores desarrollaron nuevos marcos orgánicos covalentes 2D (COF) llamados COFamides, estabilizados por enlaces de hidrógeno de amida. Estos nuevos materiales exhiben propiedades estructurales únicas debido a su diseño, ofreciendo información sobre la estabilización del marco.

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Área de la Ciencia:

Ciencias de los materiales
Química

Sus antecedentes:

Las estructuras orgánicas covalentes (COF) son polímeros porosos cristalinos.
La estabilización de las capas de COF es crucial para las propiedades del material.

Objetivo del estudio:

Para sintetizar y caracterizar una nueva clase de 2D-COFs estabilizados por enlaces de hidrógeno amida.
Investigar el impacto de los enlaces de hidrógeno en la estructura y las propiedades de los COF.

Principales métodos:

Diseño de monómeros con estructuras no planas para orientar grupos de amida.
Síntesis de COF ligados a la azina (COFamida-1) y a la imina (COFamida-2).
Caracterización mediante análisis de la superficie, determinación del tamaño de los poros, evaluación de la cristalinidad, espectroscopia infrarroja de temperatura variable y cálculos funcionales de la densidad de van der Waals.

Principales resultados:

Con éxito sintetizado COFamides con enlaces de hidrógeno amida entre las capas.
El enlace de hidrógeno estabilizó significativamente la estructura de COF en comparación con los controles.
Observación de la superficie inferior y la cristalinidad de los COF enlazados con hidrógeno, indicando un refuerzo estructural.

Conclusiones:

Los enlaces de hidrógeno de amida estabilizan efectivamente las estructuras orgánicas 2D covalentes.
Los monómeros diseñados facilitan la formación de enlaces de hidrógeno entre capas, lo que influye en las propiedades del material.
Las COFamidas representan una nueva clase de COF con estabilidad estructural ajustable.