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Complejos monoméricos de 16 electrones de π-diboreno de Zn (II) y Cd (II)

Sunewang R Wang^1,2, Merle Arrowsmith^1,2, Holger Braunschweig^1,2

¹Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg , Am Hubland, 97074 Würzburg, Germany.

Journal of the American Chemical Society

|July 27, 2017

Resumen

Los investigadores crearon nuevos complejos π de zinc y cadmio utilizando ligandos de diboreno. Estos complejos superan las débiles limitaciones de retroalimentación π del zinc (II) con olefinas simples, permitiendo compuestos estables de diboreno metálico.

Área de la Ciencia:

Química organometálica
Química del grupo principal
Química de coordinación

Sus antecedentes:

Los complejos π estables son comunes para metales d10 como Cu ((I) y Ni ((0) con olefinas.
d10 Zn(II) forma complejos débiles con las olefinas simples debido a su limitada capacidad de retro-donación π.

Objetivo del estudio:

Para sintetizar complejos π aislables de Zn (II) y Cd (II) con olefinas.
Para superar las limitaciones de la débil retro-donación π en la complejación de Zn.

Principales métodos:

Síntesis de complejos π monoméricos de 16 electrones M(II) -diboreno (M = Zn, Cd) mediante el uso de diborenos neutros.
Caracterización mediante análisis de rayos X monocristalinos, RMN en solución y espectroscopia de absorción UV.

Principales resultados:

Se sintetizaron complejos π estables de M (II) -diboreno con buenos rendimientos.
Se confirmaron las interacciones metal-B2 π en estados sólidos y disueltos.
Geometría plana trigonal alrededor de los centros de M ((II) con una interacción casi simétrica con los átomos de boro.

Conclusiones:

Los diborenos neutros con órbitas π(B=B) de alto nivel facilitan la formación de complejos π de Zn(II) y Cd(II) estables.
La geometría y los ángulos de torsión de los complejos dependen de las interacciones estéricas.

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