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Transferencia de electrones acoplados a protones en la reducción de arenas por complejos SmI2-agua
Tesia V Chciuk1, Robert A Flowers1
1Department of Chemistry, Lehigh University , 6 E. Packer Ave. Bethlehem, Pennsylvania 18015, United States.
Journal of the American Chemical Society
|August 15, 2015
Resumen
La reducción de arenas por dióxido de samario (SmI2) y agua implica la transferencia de electrones acoplados a protones. La coordinación de agua a Sm ((II) debilita significativamente el enlace O-H, facilitando esta vía de reacción.
Área de la Ciencia:
- Química inorgánica
- Química Física
- Síntesis orgánica
Sus antecedentes:
- El papel del agua en las reducciones mediadas por dioduro de samario (SmI2) no se comprende completamente.
- El mecanismo exacto de la transferencia de electrones y protones en los sistemas de agua Sm (II) sigue sin estar claro.
Objetivo del estudio:
- Para aclarar el mecanismo de reducción de areno por SmI2-agua.
- Para investigar la interacción entre la transferencia de electrones y la transferencia de protones en este sistema.
Principales métodos:
- Se utilizaron datos termoquímicos de la literatura existente.
- Analizó las propiedades electrónicas y estructurales de los complejos de Sm (II) -agua.
Principales resultados:
- Demostró que la reducción de areno por SmI2 agua procede a través de una transferencia inicial de electrones acoplados a protones.
- Cuantificó un debilitamiento significativo del enlace O-H en los complejos Sm(II) -agua tras la coordinación.
- Se informó de una disminución de la energía de disociación del enlace OH de ~73 kcal/mol, la mayor observada para los reductores de baja valencia con agua unida.
Conclusiones:
- El sistema SmI2-agua facilita la reducción a través de un mecanismo de transferencia de electrones acoplado a protones.
- La coordinación del agua a Sm ((II) debilita dramáticamente el enlace O-H, mejorando su reactividad.
- Este estudio proporciona información clave sobre la reactividad fundamental de SmI2 en presencia de agua.
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