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Bases de metal orgánico tipo zeolita como plataformas para aplicaciones: en catalizadores basados en metaloporfirina

Mohamed H Alkordi¹, Yunling Liu, Randy W Larsen

¹Department of Chemistry, University of South Florida, 4202 East Fowler Avenue (CHE205), Tampa, Florida 33620, USA.

Journal of the American Chemical Society

|September 2, 2008

Resumen

Las estructuras orgánicas metálicas (ZMOFs) de tipo zeolita permiten la encapsulación de porfirina de una sola molécula, evitando la degradación. Esta nueva plataforma produce catalizadores de Mn-porfirina altamente activos y reciclables para la oxidación del ciclohexano.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
La catálisis es la catálisis.
Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

Las estructuras orgánicas metálicas (ZMOF) parecidas a las zeolitas poseen grandes cavidades adecuadas para encapsular moléculas grandes.
Las porfirinas son susceptibles a la autodegradación oxidativa cuando se agregan en sistemas homogéneos o de estado sólido.
El control de la agregación de la porfirina es crucial para mantener la actividad catalítica y la estabilidad.

Objetivo del estudio:

Explorar el potencial de los ZMOF para encapsular las porfirinas.
Desarrollar una plataforma de catalizador heterogéneo estable y eficiente utilizando ZMOFs.
Para investigar la actividad catalítica de las metaloporfirinas confinadas dentro de las cavidades de ZMOF.

Principales métodos:

Síntesis de un rho-ZMOF a base de indio con jaulas alfa muy grandes.
Encapsulación in situ de una porfirina catiónica de base libre dentro de las jaulas alfa del ZMOF.
Metalización de la porfirina encapsulada con varios iones de metal de transición (Mn, Cu, Co, Zn).
Prueba de la actividad catalítica del Mn-metalloporphyrin@rho-ZMOF para la oxidación del ciclohexano.

Principales resultados:

Exitosa encapsulación de una sola molécula de una porfirina catiónica dentro de las jaulas alfa rho-ZMOF.
El marco ZMOF impidió la autodegradación y agregación de la porfirina.
Preparación de una serie de metaloporfirinas (Mn, Cu, Co, Zn) dentro de la plataforma ZMOF.
El Mn-metalloporphyrin@rho-ZMOF exhibió una alta actividad catalítica y reciclabilidad (11 ciclos) para la oxidación del ciclohexano, superando a sistemas heterogéneos similares.

Conclusiones:

Los Rho-ZMOF proporcionan una plataforma efectiva para aislar moléculas de porfirina individuales, mejorando su estabilidad.
Las metaloporfirinas encapsuladas con ZMOF demuestran un rendimiento catalítico y una longevidad superiores en comparación con los catalizadores heterogéneos existentes.
Este enfoque ofrece una estrategia prometedora para diseñar catalizadores robustos y eficientes para reacciones de oxidación desafiantes.

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