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Caracterización de un complejo paramagnético mononuclear no hemo de hierro-superoxo

Chien-Wei Chiang¹, Scott T Kleespies, Heather D Stout

¹Department of Chemistry, National Taiwan Normal University , Taipei 11677, Taiwan (ROC).

Journal of the American Chemical Society

|July 19, 2014

Resumen

Este estudio caracteriza un adducto de superóxido de hierro reversible utilizando espectroscopia. Esta especie de superóxido de hierro puede abstraer átomos de hidrógeno, apoyando su papel en los mecanismos enzimáticos del hierro no hemo.

Área de la Ciencia:

Química bioorgánica Química bioorgánica.
Química organometálica Química orgánica de los metales.

Sus antecedentes:

Las enzimas de hierro no hemo juegan un papel crucial en las reacciones de oxidación biológica.
Comprender los intermediarios reactivos involucrados es clave para dilucidar sus mecanismos.

Objetivo del estudio:

Para caracterizar el adducto de oxígeno de Fe (II) (BDPP).
Para investigar la estructura electrónica y la reactividad de las especies de superóxido de hierro.

Principales métodos:

Burbujeo de oxígeno en una solución de Fe (II) (BDPP) a baja temperatura.
Caracterización mediante espectroscopia Raman de resonancia.
Caracterización mediante la espectroscopia de Mössbauer.

Principales resultados:

Formación de un adducto de superóxido de hierro de color amarillo brillante reversible (Fe ((III) -O2 ((-)).).
La espectroscopia Raman de resonancia identificó una vibración característica de un ligando superóxido unido.
La espectroscopia de Mössbauer reveló un intercambio de centro de hierro de alto espín ((III) acoplado al superóxido.

Conclusiones:

El adducto caracterizado es una especie de Fe (III) superóxido.
Esta especie puede abstraer átomos de hidrógeno de los enlaces C-H, apoyando los mecanismos propuestos para las enzimas de hierro no hemo.

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