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Sitios reactivos de hierro de alto espín mediante activación de oxígeno en un marco metálico-orgánico
Kaipeng Hou1,2, Jonas Börgel1,2, Henry Z H Jiang1
1Department of Chemistry, University of California, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|November 2, 2023
Resumen
Los químicos sintéticos han imitado las enzimas de hierro no hemo mediante la creación de un marco metálico-orgánico que activa el oxígeno para formar especies de hierro de alto espín, lo que permite reacciones de oxigenación catalítica.
Área de la Ciencia:
- Química bioorgánica
- Ciencias de los materiales
- Catálisis
Sus antecedentes:
- Las enzimas de hierro no hemo activan el oxígeno para formar especies de hierro de alto espín para las reacciones de oxigenación.
- Imitar esta reactividad enzimática en sistemas sintéticos ha sido un desafío de larga data.
Objetivo del estudio:
- Desarrollar un sistema sintético que pueda imitar la activación enzimática del O2 por centros de hierro no hemo.
- Para crear hierro de alto espín (IV) = O especies en un marco metálico-orgánico.
Principales métodos:
- Utilizó un marco metálico-orgánico con sitios de hierro que imitan a las dioxigenasas dependientes del α-cetoglutarato.
- Se empleó en la transformación de Fourier de reflexión difusa infrarroja in situ, la espectroscopia de Mössbauer, la emisión de rayos X Fe Kβ y la espectroscopia vibratoria de resonancia nuclear para la caracterización.
- Investigó la reacción con O2 a bajas temperaturas.
Principales resultados:
- Se formó con éxito una especie de hierro de alto espín dentro del marco metálico-orgánico.
- Demostró la competencia del marco en la oxigenación catalítica del ciclohexano.
- Se ha demostrado la conversión estequiométrica del etano en etanol en presencia de O2.
Conclusiones:
- El marco metálico-orgánico desarrollado imita efectivamente la actividad de la enzima del hierro no hemo.
- Se logra una activación de O2 similar a la enzima y la formación de especies de hierro de alto espín (IV) = O.
- El marco muestra el potencial de aplicaciones catalíticas en reacciones de oxigenación.
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