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Los oxidantes catalíticamente activos mu-Oxodiiron (IV) del hierro (III) y el dioxígeno (IV) son oxidantes del hierro
Anindya Ghosh1, Filipe Tiago de Oliveira, Toshihiro Yano
1Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Journal of the American Chemical Society
|February 24, 2005
Resumen
Un nuevo complejo de hierro reacciona con el oxígeno para formar un compuesto estable di-hierro-IV-mu-oxo. Este compuesto cataliza eficientemente las reacciones de oxidación y ofrece una alternativa más ecológica para los procesos químicos.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- La catálisis es la catálisis.
- Química verde es la química verde.
Sus antecedentes:
- Los complejos de hierro son cruciales en varios procesos de oxidación catalítica.
- El desarrollo de especies estables y activas de oxóferos de hierro sigue siendo un desafío clave en la catálisis.
- El oxígeno (O2) es un oxidante verde ideal debido a su abundancia y respetuosidad con el medio ambiente.
Objetivo del estudio:
- Síntesis y caracterización de un compuesto estable y catalíticamente activo de diiron (IV) -mu-oxo.
- Para investigar el mecanismo de reacción entre un complejo Fe (III) y O (II).
- Para evaluar la actividad catalítica del complejo resultante di-hierro-mu-oxo en reacciones de oxidación.
Principales métodos:
- Reacción de los complejos Fe(III) -TAML con O(2) en el diclorometano.
- Caracterización mediante cristalografía de rayos X, microanálisis, espectrometría de masas, espectroscopia UV/Vis, Mossbauer y RMN.
- Estudios de etiquetado isotópico con (18) O (((2) y H (((2) ((18) O para determinar la fuente de oxígeno.
Principales resultados:
- Se sintetizaron complejos diironio ((IV) estables y negros con puentes mu-oxo-muxo en altos rendimientos.
- La caracterización confirmó sitios diamagnéticos, antiferromagnéticamente acoplados Fe (IV).
- Se confirmó que el átomo de oxígeno de puente se originó a partir de O(2); se demostró la oxidación catalítica de los alcoholes y el blanqueo de tintes.
Conclusiones:
- Se sintetizó con éxito un nuevo y estable compuesto diironio-IV-mu-oxo a partir de un precursor de Fe (III) y O (II).
- El compuesto exhibe una actividad catalítica significativa en reacciones de oxidación selectiva.
- Este desarrollo representa un avance prometedor en la tecnología de oxidación verde que utiliza O{2).
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