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Transformación supramolecular de polímeros estrella vinculados al ciclo metálico impulsada por una reacción simple de
Wei Zheng1, Wei Wang1, Shu-Ting Jiang1
1Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , P. R. China.
Journal of the American Chemical Society
|November 30, 2018
Resumen
Los investigadores crearon polímeros estelares dinámicos utilizando la química de los ligandos metálicos. Esta estrategia de transformación supramolecular permite cambios reversibles en la arquitectura y las propiedades del polímero, allanando el camino para nuevos materiales inteligentes.
Área de la Ciencia:
- Química de los polímeros
- Química supramolecular
- Ciencias de los materiales
Sus antecedentes:
- Las transformaciones biomacromoleculares supramoleculares impulsan las funciones biológicas, inspirando sistemas dinámicos biomiméticos.
- El control preciso de las propiedades de las macromoléculas artificiales a través de estrategias supramoleculares sigue siendo un desafío significativo en la química de polímeros.
Objetivo del estudio:
- Desarrollar un nuevo método para la construcción de materiales poliméricos dinámicos con propiedades sintonizables.
- Para demostrar la fácil transformación de las arquitecturas de polímeros estelares utilizando la química supramolecular.
Principales métodos:
- Se combinó la autoensamblaje impulsada por la coordinación y la polimerización de apertura de anillos después del ensamblaje para sintetizar un polímero estrella con un núcleo de ciclo metálico hexagonal.
- Se incorporaron porciones de acetilo transplatino como sitios de transformación en el andamio del ciclo metálico.
- Se emplearon reacciones de intercambio de ligandos de fosfina para inducir transformaciones controladas de la arquitectura del ciclo metálico y del polímero estrellado.
Principales resultados:
- Se sintetizó con éxito un polímero estrella de seis brazos con un núcleo de ciclo metálico hexagonal bien definido.
- El andamio del ciclo metálico sufrió sucesivas transformaciones hexágono-romboide-hexágono desencadenadas por el intercambio de ligandos.
- Esta transformación supramolecular condujo a cambios correspondientes en la arquitectura y propiedades del polímero estrella.
- Se logró la transformación reversible entre las arquitecturas de polímero estelar y lineal.
Conclusiones:
- Se construyó con éxito un sistema dinámico de polímero estrella utilizando la coordinación metal-ligando y las reacciones de intercambio de ligando.
- El estudio demuestra un enfoque prometedor para la creación de nuevos materiales poliméricos dinámicos con propiedades ajustables.
- Esta estrategia ofrece un fácil control sobre la arquitectura del polímero y las transformaciones supramoleculares.
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