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Reducción a base de ligandos de CO(2) a CO mediada por un complejo de nitruro de niobio aniónico
Jared S Silvia1, Christopher C Cummins
1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Journal of the American Chemical Society
|February 4, 2010
Resumen
Este estudio demuestra un nuevo ciclo cerrado para la conversión de dióxido de carbono (CO2) en monóxido de carbono (CO) utilizando un complejo aniónico de nitruro terminal. El proceso implica la fijación y liberación reversible de CO2, ofreciendo una nueva vía para la utilización de CO2.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química del niobio
- Utilización del dióxido de carbono Utilización del dióxido de carbono
Sus antecedentes:
- Los complejos de aniones de nitruro terminal son especies reactivas en la química inorgánica.
- Los ciclos catalíticos eficientes para la conversión de dióxido de carbono son muy buscados.
- Comprender la reactividad de los nitritos metálicos con moléculas pequeñas es crucial para desarrollar nuevas transformaciones químicas.
Objetivo del estudio:
- Para investigar la reacción de un complejo aniónico de nitruro de niobio terminal con dióxido de carbono.
- Para caracterizar el complejo de carbamato resultante y explorar su reactividad posterior.
- Establecer un ciclo catalítico cerrado para la conversión de CO2 en CO mediada por el complejo de nitruro de niobio.
Principales métodos:
- Síntesis y caracterización de nitruro de niobio y complejos de carbamato.
- Cristalografía de rayos X para determinar la estructura del complejo de carbamato.
- Reacciones con anhídridos de ácidos orgánicos, cloruros de ácidos y condiciones reductivas para demostrar el ciclo catalítico.
Principales resultados:
- El complejo aniónico de nitruro terminal reacciona cuantitativamente con el CO2 para formar un complejo de carbamato N-unido.
- El complejo de carbamato se somete a la eliminación de la sal con agentes aciladores para obtener complejos de cinco coordenadas.
- Estos complejos pueden reducirse para regenerar el nitruro inicial y liberar CO, completando un ciclo de CO2 a CO.
Conclusiones:
- Se ha establecido un nuevo ciclo cerrado para la conversión de CO2 en CO mediado por un complejo aniónico de nitruro de niobio terminal.
- El ligando carbamato N-unido exhibe una reactividad única, lo que permite nuevas transformaciones.
- Este trabajo proporciona una nueva ruta sintética para la utilización de CO2 y la producción de CO.
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