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La cooperación de ligandos en la hidrogenación formal de N2O utilizando un complejo de pinzas de iridio PC(sp2) P

Lauren E Doyle¹, Warren E Piers, Javier Borau-Garcia

¹Department of Chemistry, University of Calgary , 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada.

Journal of the American Chemical Society

|February 3, 2015

Resumen

Los investigadores desarrollaron un nuevo complejo de iridio que convierte el óxido nitroso y el hidrógeno en nitrógeno y agua. Este descubrimiento allana el camino para posibles aplicaciones catalíticas en la síntesis química.

Área de la Ciencia:

Química organometálica Química orgánica de los metales.
La catálisis es la catálisis.
Química Inorgánica La Química Inorgánica es la química inorgánica.

Sus antecedentes:

El desarrollo de nuevos ligandos es crucial para avanzar en la catálisis de metales de transición.
Los complejos de iridio son catalizadores versátiles para diversas transformaciones químicas.

Objetivo del estudio:

Para sintetizar y caracterizar un nuevo complejo de iridio con un ligando de pinza PC ((carbeno) P.
Para investigar la reactividad de este complejo con óxido nitroso e hidrógeno.
Explorar la vía mecanicista para la conversión de N2O y H2 en N2 y H2O.

Principales métodos:

Síntesis de un nuevo ligando de pinza PC ((carbeno) P con enlaces de benzo[b]tiofeno.
Coordinación del ligando hacia un centro de Iridio (I).
Reacción del complejo de iridio con N2O para formar un iridaepoxide.
Reacción posterior con H2 para obtener un producto de adición oxidativa.
Estudios cinéticos y espectroscópicos para elucidar los mecanismos de reacción.

Principales resultados:

Formación de una especie de iridaepoxide estable a partir de la reacción con N2O.
Adición oxidativa de H2 para formar un complejo dihidruro.
Identificación de un paso de isomerización requerido para la eliminación de H2O.
Se logró la conversión estequiométrica de N2O y H2 a N2 y H2O.

Conclusiones:

El nuevo complejo de iridio facilita la conversión estequiométrica de N2O y H2 a N2 y H2O.
Las ideas mecánicas sugieren el potencial para el desarrollo de un sistema catalítico.
Este trabajo amplía el alcance de la química de los ligandos de pinza en la catálisis organometálica.

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