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El efecto caotrópico como motivo de ensamblaje para construir estructuras basadas en ciclodextrina y polioxometalato
Soumaya Khlifi1, Jérôme Marrot1, Mohamed Haouas1
1Université Paris-Saclay, UVSQ, CNRS, UMR8180, Institut Lavoisier de Versailles, 78000 Versailles, France.
Journal of the American Chemical Society
|March 1, 2022
Resumen
Desarrollamos nuevos marcos híbridos utilizando polioxometalatos y ciclodextrinas. Estos materiales crean cavidades grandes y sintonizables para la química huésped-huésped y aplicaciones funcionales.
Área de la Ciencia:
- Química supramolecular
- Ciencias de los materiales
- Nanotecnología
Sus antecedentes:
- Los polioxometalatos de baja carga (POM) muestran autoensamblaje con materia orgánica, avanzando la química huésped-huésped y la ciencia de la materia blanda.
- Las ciclodextrinas (CD) son macrociclos versátiles con capacidades inherentes de huésped-invitado.
Objetivo del estudio:
- Mejorar la diversidad estructural y funcional de los marcos abiertos basados en ciclodextrina.
- Aprovechar la afinidad entre los polioxometalatos y las ciclodextrinas para el diseño de nuevos marcos.
Principales métodos:
- Utilizó el polioxometalato de tipo Anderson-Evans [AlMo6O18(OH) 6− como andamio inorgánico.
- Se empleó un análisis de rayos X monocristalino para determinar la arquitectura y topología supramolecular.
- Se han incorporado diferentes ciclodextrinas (α-, β- y γ-CD) para estudiar las variaciones estructurales.
Principales resultados:
- Se han diseñado con éxito estructuras híbridas abiertas con canales infinitos de ciclodextrina unidos por POM.
- Se ha observado la formación de grandes cavidades (hasta 2 nm) con topologías dictadas por la simetría de la ciclodextrina (combos de miel, en forma de tablero de ajedrez).
- Se ha demostrado la funcionalidad del marco mediante la captura de polioduros y polianiones redox-activos.
Conclusiones:
- El POM de Anderson-Evans sirve como un andamio eficiente para crear diversos marcos supramoleculares basados en ciclodextrina.
- La topología del marco es controlable mediante la elección de las unidades de construcción de ciclodextrina y POM.
- Estos resultados permiten el diseño de estructuras supramoleculares multifuncionales con dimensiones de poro ajustables.
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