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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
Química de coordinación de estanilenos y plumbilenos desiliados cíclicos a los metallocenos del grupo 4
Henning Arp1, Judith Baumgartner, Christoph Marschner
1Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, 8010 Graz, Austria.
Journal of the American Chemical Society
|June 22, 2012
Resumen
Se sintetizaron nuevos complejos de metaloceno con tetrileno fosfina y los ligandos de cetrileno. El análisis computacional reveló un carácter de enlace múltiple en el enlace metal-elemento, con una fuerza de enlace variable entre los metales del grupo 4 y los congéneres de estaño / plomo.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Grupo Principal Química.
- Química computacional es la química computacional.
Sus antecedentes:
- Los complejos de metaloceno son cruciales en la catálisis y la ciencia de los materiales.
- Comprender el enlace metal-elemento es clave para predecir la reactividad.
- Los metallocenos del grupo 4 y los elementos más pesados del grupo 14 ofrecen propiedades electrónicas únicas.
Objetivo del estudio:
- Para sintetizar nuevos complejos de metalloceno tetrileno fosfina y cetrileno.
- Para investigar las características de unión de la unión metal-elemento.
- Para explorar los factores que influyen en la fuerza de enlace metal-elemento.
Principales métodos:
- Reducción de los dicloruros de metaloceno del grupo 4 utilizando magnesio.
- Reacción con los adductos cíclicos desillados de estanileno/plumbileno con fosfina o el estanileno/plumbileno dimerizado.
- Análisis computacional (por ejemplo, DFT) para estudiar la estructura electrónica y la unión.
Principales resultados:
- Síntesis exitosa de metalloceno tetrileno fosfina y complejos de cetrileno.
- El análisis computacional reveló un carácter de enlace múltiple significativo para el enlace M-E (II).
- La fuerza de enlace metal-elemento aumenta hacia abajo en el grupo 4 y disminuye de Sn a Pb.
- La debilidad de los enlaces Ti-E(II) se atribuye a la reducción de la capacidad de enlace d-p π-back del titanio.
Conclusiones:
- El estudio demuestra una nueva vía sintética para los complejos metaloceno-tetrileno del grupo 4.
- La unión múltiple juega un papel crítico en la estabilidad y propiedades de estos compuestos.
- Los factores electrónicos, en particular el π-back-bonding, influyen significativamente en la fuerza de enlace metal-elemento.
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