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Síntesis de complejos de iridio de pinza PBP: un ligando borilo de apoyo

Yasutomo Segawa¹, Makoto Yamashita, Kyoko Nozaki

¹Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo 7-3-1, Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan.

Journal of the American Chemical Society

|June 16, 2009

Resumen

Los investigadores sintetizaron un nuevo precursor de ligando de pinza de PBP y lo complejizaron con iridio. Este estudio detalla la formación de nuevos complejos de iridio y destaca el ligando PBP.

Área de la Ciencia:

Química organometálica Química orgánica de los metales.
Coordinación Química de la Coordinación
Diseño del ligando diseño de ligando.

Sus antecedentes:

Los ligandos de pinza son cruciales en la catálisis debido a sus propiedades únicas de coordinación.
Comprender las capacidades de los donantes de ligandos es clave para diseñar complejos metálicos eficientes.
Los complejos de iridio son ampliamente estudiados por sus aplicaciones catalíticas.

Objetivo del estudio:

Para sintetizar un nuevo precursor del ligando de la pinza fosfinoborane-fosfinoborane (PBP).
Para investigar la complejación del ligando PBP con el iridio (I).
Para caracterizar los complejos de iridio resultantes y evaluar las propiedades electrónicas del ligando.

Principales métodos:

Síntesis del precursor del ligando de pinza de PBP (2).
Complejación del precursor 2 con iridio (I) a través de adición oxidativa B-H para formar el complejo 3.
Reacciones del complejo 3 con monóxido de carbono y LiTMP bajo etileno para formar complejos 7 y 9, respectivamente.
Caracterización estructural, incluida la cristalografía de rayos X para determinar las longitudes de enlace.

Principales resultados:

Síntesis exitosa del precursor del ligando de la pinza PBP 2.
Formación de un complejo coordinadamente insaturado de iridio (I), [PBP] (hidrido) cloroiridio (3).
Síntesis de [PBP] (hidrido) cloro (carbonilo) iridio (7) y [PBP] (etileno) iridio (I) (9).
La comparación de las longitudes de enlace Ir-Cl indicó una mayor capacidad de donante sigma del ligando PBP en comparación con los ligandos PCP.

Conclusiones:

El ligando de la pinza PBP demuestra una coordinación efectiva con el iridio.
El ligando PBP exhibe propiedades sigma-donantes superiores en comparación con los ligandos PCP.
Los complejos de iridio sintetizados sirven como plataformas valiosas para futuros estudios catalíticos.

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