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Intercambio de huéspedes a través del transporte facilitado en un marco de enlace de hidrógeno aparentemente
Yuantao Li1, Marcel Handke1, Yu-Sheng Chen2
1Department of Chemistry and Molecular Design Institute , New York University , 100 Washington Square East, Room 1001 , New York , New York 10003 , United States.
Journal of the American Chemical Society
|September 29, 2018
Resumen
El intercambio de huéspedes en un marco de huésped de guanidinium se logró a través de la transformación de cristal único a cristal único. Este proceso facilitó la incorporación de hexafluorobenzeno en bolsas previamente inaccesibles, lo que demuestra un rápido intercambio de invitados.
Área de la Ciencia:
- Química supramolecular
- Ciencias de los materiales
- La cristalografía
Sus antecedentes:
- El guanidinium 1,3,5-tri(4-sulfofenil) benceno (G3TSPHB) forma compuestos de inclusión con las moléculas invitadas.
- El marco anfitrión contiene bolsillos aislados, lo que plantea desafíos para el intercambio de invitados.
Objetivo del estudio:
- Investigar el intercambio de invitados en G3TSPHB utilizando una transformación de cristal único a cristal único (SCSCT).
- Para aclarar el mecanismo de la incorporación de hexafluorobenzeno (HFB) en el marco del huésped.
Principales métodos:
- Difracción de rayos X monocristalino para controlar los cambios estructurales durante el SCSCT.
- Microscopía óptica y Raman para observar las fases intermedias y la dinámica de los invitados.
- Análisis in situ de los procesos de intercambio de invitados.
Principales resultados:
- El SCSCT permitió el intercambio de isoforona con HFB en el marco de G3TSPHB.
- La simetría cristalina cambió de monoclínica a hexagonal durante la transformación.
- Las estructuras lamelares se formaron y se unieron, facilitando el rápido transporte de huéspedes.
Conclusiones:
- SCSCT proporciona una vía eficiente para el intercambio de invitados en materiales cristalinos porosos.
- El transporte facilitado a lo largo de las interfaces lamelares acelera la difusión del huésped.
- Este estudio demuestra un método para modificar compuestos de inclusión con huéspedes previamente inaccesibles.
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