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Complejos de borilo del grupo 4 de metales de transición: síntesis, estructuras, propiedades de enlace boro-metal y

Tomomi Terabayashi¹, Takashi Kajiwara, Makoto Yamashita

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

Journal of the American Chemical Society

|September 25, 2009

Resumen

Los investigadores sintetizaron nuevos complejos de borilo del grupo 4, los primeros de su tipo. Estos compuestos de titanio y hafnio exhiben un enlace covalente boro-metal y potencial para la polimerización de olefinas.

Área de la Ciencia:

Química organometálica Química orgánica de los metales.
Grupo Principal Química.

Sus antecedentes:

Los complejos de boro son intermediarios cruciales en la catálisis.
Los metales del grupo 4 son ampliamente utilizados en la polimerización.

Objetivo del estudio:

Para sintetizar y caracterizar nuevos complejos de borilo del grupo 4.
Para investigar la estructura electrónica del enlace boro-metal.
Para explorar la actividad catalítica de estos complejos en la polimerización.

Principales métodos:

La borilación nucleofílica mediante el uso de borilitio.
Síntesis de complejos de boril-titanio y boril-hafnio.
Cálculos teóricos (DFT) en sistemas modelo.
Estudios de polimerización de etileno y hex-1-eno.

Principales resultados:

Síntesis exitosa de complejos de boriltitanio (2) y borilhafnio (3).
Los complejos 2 y 3 representan los primeros compuestos borilmetálicos del grupo 4 reportados.
Los cálculos teóricos confirmaron un carácter covalente para el enlace boro-metal.
El complejo de hafnio 3 demostró actividad catalítica en la polimerización de etileno y hex-1-eno.

Conclusiones:

El desarrollo de complejos de borilo del grupo 4 amplía el alcance de la química organometálica.
El enlace covalente boro-metal influye en la reactividad.
Los complejos de borilohafnio son prometedores como catalizadores para la polimerización de las olefinas.

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