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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
Published on: January 17, 2020
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Mecanismo microscópico de inducción quiral en un marco metálico-orgánico
Jack D Evans1, François-Xavier Coudert1
1Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris , 75005 Paris, France.
Journal of the American Chemical Society
|May 6, 2016
Resumen
La inducción quiral en estructuras metal-orgánicas (MOF) utilizando N-metil-2-pirrolidona (NMP) es posible, pero el MOF-5 quiral resultante es inestable. La quiralidad se pierde con la eliminación del huésped, lo que limita las aplicaciones en la separación y catálisis enantioselectivas.
Área de la Ciencia:
- Ciencias de los materiales
- Química supramolecular
- Química computacional
Sus antecedentes:
- Las estructuras metal-orgánicas (MOF) son materiales porosos con aplicaciones potenciales en la separación y catálisis enantioselectiva.
- Recientemente se ha informado de la inducción quiral en MOFs a través de la adsorción no quiral del huésped, lo que ofrece una nueva ruta para producir MOFs quirales.
- MOF-5, un marco prototípico, ha demostrado este fenómeno de inducción quiral.
Objetivo del estudio:
- Para aclarar el mecanismo microscópico de la inducción quiral en MOF-5 por adsorción no quiral del huésped.
- Para investigar la estabilidad de la estructura quiral MOF-5 después de la eliminación del huésped.
- Comprender el papel de las propiedades de las moléculas invitadas (tamaño, naturaleza química) en el proceso de transformación quiral.
Principales métodos:
- Se empleó simulación molecular multiscala para estudiar el proceso de inducción quiral.
- Se analizaron las interacciones entre las moléculas invitadas (N-metil-2-pirrolidona y N,N-dimetilformamida) y el marco MOF-5.
- Se evaluó la estabilidad energética de la estructura quiral MOF-5 libre de huéspedes.
Principales resultados:
- El tamaño molecular y la naturaleza química de la N-metil-2-pirrolidona (NMP) fueron identificados como factores clave que permiten la inducción quiral en MOF-5.
- La N,N-dimetilformamida (DMF) no indujo quiralidad, lo que pone de relieve la especificidad de la interacción.
- Se encontró que la estructura quiral MOF-5 sin huésped era energéticamente inestable, favoreciendo la configuración achiral o de poro cerrado.
Conclusiones:
- La inducción quiral en MOF-5 por NMP es un fenómeno válido, pero la quiralidad resultante no se conserva tras la eliminación del huésped debido a la inestabilidad del marco.
- Esta inestabilidad limita la aplicación directa de este método para crear MOFs quirales estables para la separación y la catálisis.
- El estudio proporciona información microscópica crucial sobre las interacciones entre el marco invitado y sugiere explorar otras moléculas invitadas para aplicaciones potenciales.
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