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Ensamblaje tubular forzado de macrociclos electrónicamente diferentes Hexakis ((m-fenileno-etileno): apilamiento
Yulong Zhong1, Yi Yang1, Yi Shen2
1College of Chemistry, Beijing Normal University , Beijing 100875, China.
Journal of the American Chemical Society
|October 19, 2017
Resumen
El enlace de hidrógeno impulsa el autoensamblaje de los macrociclos en pilas helicoidales y columnares. Esta alineación molecular es independiente de la electrónica de la columna vertebral y forma nanotubos adaptables para varios componentes.
Área de la Ciencia:
- Química supramolecular
- Ciencias de los materiales
- Química orgánica
Sus antecedentes:
- Los macrociclos son moléculas con anillos grandes.
- El autoensamblaje es crucial para crear estructuras ordenadas.
- El enlace de hidrógeno y el apilamiento aromático son interacciones clave no covalentes.
Objetivo del estudio:
- Investigar el papel del enlace de hidrógeno en el autoensamblaje del macrociclo.
- Para determinar si las propiedades electrónicas de la columna vertebral influyen en el ensamblaje columnar.
- Para explorar la formación de estructuras tubulares a partir de macrociclos.
Principales métodos:
- Síntesis de macrociclos hexagónicos (m-fenileno-etileno) con propiedades electrónicas variables.
- Análisis espectroscópico que incluye RMN 1H, absorción, fluorescencia y dicroísmo circular (CD).
- Microscopía de fuerza atómica (AFM) para visualizar estructuras autoensambladas.
Principales resultados:
- Los macrociclos se agregan fuertemente a través de enlaces de hidrógeno en disolventes no polares, formando pilas helicoidales.
- El ensamblaje es independiente de las propiedades electrónicas de la columna vertebral, pero es sensible a la polaridad del disolvente.
- El AFM confirmó la formación de nanotubos de una sola columna.
- La heteroasociación condujo a la formación de nanotubos híbridos.
Conclusiones:
- El enlace de hidrógeno es la fuerza dominante que impulsa el autoensamblaje columnar de estos macrociclos.
- Las pilas helicoidales resultantes forman nanotubos capaces de acomodar diversos componentes moleculares.
- Este trabajo proporciona un método general para alinear macrociclos de forma persistente en estructuras tubulares funcionales.
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