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Reactividad ambifílica de los complejos de iridio con N-ligandos de vinilideno heterocíclicos

Tak Hin Wong¹, Paul Varava¹, Farzaneh Fadaei-Tirani¹

¹Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

Journal of the American Chemical Society

|May 28, 2025

Resumen

Las diazoolefinas estables a temperatura ambiente permiten nuevos ligandos de vinilideno N-heterocíclicos. Los complejos de iridio con estos ligandos muestran una reactividad única, formando nuevas especies donantes de carbono y ofreciendo información sobre la química organometálica.

Área de la Ciencia:

Química organometálica
Diseño del ligando
Catálisis

Sus antecedentes:

Los carbenos N-heterocíclicos (NHC) son ligandos versátiles en la química organometálica.
Las diazoolefinas ofrecen una vía para nuevas arquitecturas de ligandos.
Los precursores estables a temperatura ambiente son cruciales para la síntesis de ligandos.

Objetivo del estudio:

Para sintetizar y caracterizar los complejos de iridio con ligandos terminales de vinildeno N-heterocíclico.
Para explorar la reactividad de estos nuevos complejos de iridio.
Generar nuevas clases de ligandos donantes de carbono y especies organometálicas.

Principales métodos:

Reacción de (Cp*IrCl2) 2 con las diazoolefinas N-heterocíclicas.
Abstracción y reducción de cloruro para formar complejos catiónicos e iridio neutro.
Análisis cristalográfico para determinar las características estructurales.

Principales resultados:

Síntesis de complejos catiónicos [Cp*IrClL]X y de complejos neutrales de Cp*IrL de iridio.
Se han observado enlaces cortos iridio-carbono, lo que indica un carácter parcial de carbino.
Los ligandos de vinilideno exhibieron reactividad ambifílica, formando adyuctos con haluros/pseudohaluros y reaccionando con electrófilos.

Conclusiones:

Las diazoolefinas estables a temperatura ambiente son precursores efectivos de los ligandos de vinildeno N-heterocíclico.
Los complejos de iridio sintetizados muestran propiedades estructurales y reactivas únicas.
Estos hallazgos abren vías para generar nuevos ligandos donantes de carbono y compuestos organometálicos.

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