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Regulación de la conformación de los ligandos terpiridina multivalentes para el autoensamblaje de las supramoleculas
Shi-Cheng Wang1, Kai-Yu Cheng1, Jun-Hao Fu1
1Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan.
Journal of the American Chemical Society
|September 4, 2020
Resumen
Los investigadores exploraron un sistema de dos ligandos para construir moléculas complejas y estudiar el autoensamblaje. Descubrieron que las interacciones de ligandos controlan la formación de estructuras específicas en forma de estrella, revelando pasos clave en el autoensamblaje de varios componentes.
Área de la Ciencia:
- Química supramolecular
- Química de coordinación
- Ciencias de los materiales
Sus antecedentes:
- Los ligandos basados en terpiridina son bloques de construcción versátiles en la química supramolecular.
- El autoensamblaje metalosupramolecular ofrece vías a arquitecturas complejas.
- La comprensión de las interacciones ligando-receptor es crucial para el diseño de sistemas autoensamblados.
Objetivo del estudio:
- Investigar el mecanismo de autoensamblaje de las metalosupramoleculas heterolépticas utilizando un sistema de dos ligandos.
- Explorar el papel del emparejamiento de ligandos complementarios en la construcción de arquitecturas complejas.
- Para aclarar la influencia de la complejación heteroléptica intermolecular en las vías de autoensamblaje.
Principales métodos:
- Diseño y síntesis de ligandos prediseñados multivalentes y complementarios basados en terpiridina.
- Explotación de un sistema de dos ligandos para la construcción metalosupramolecular.
- Investigación de los mecanismos de autoensamblaje a través de la estellación y fragmentación molecular.
Principales resultados:
- Autoensamblaje exclusivo de un hexágono estrellado [Cd18L6L3] a partir de un hexágono trímero [Cd6L3] a través del emparejamiento de ligandos complementarios.
- Troncación del hexágono estrellado en fragmentos triangulares [Cd12L3L3] y [Cd12L3L3] para estudiar las vías de ensamblaje.
- Demostración de que la regulación conformacional del ligando hexatópico L por L promueve el autoensamblaje exitoso de varios componentes en [Cd12L3L3].
- Identificación de productos intermedios geométricamente desajustados que impiden la formación de [Cd12L3L3].
Conclusiones:
- El diseño de ligandos y el emparejamiento complementario son críticos para la formación selectiva de arquitecturas metalosupramoleculares complejas.
- El proceso de autoensamblaje es muy sensible a la conformación del ligando y la compatibilidad geométrica.
- Este estudio proporciona información sobre el control del autoensamblaje multicomponente a través de la regulación del ligando.
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