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Tetrasilaciclobutadieno ((t) Bu (((2) MeSi) ((4) Si(4): un nuevo ligando para los complejos de metales de transición
Kazunori Takanashi1, Vladimir Ya Lee, Tadahiro Matsuno
1Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
Journal of the American Chemical Society
|April 21, 2005
Resumen
Los investigadores sintetizaron un nuevo complejo de cobalto aniónico con un ligando tetrasilaciclobutadieno. Este innovador compuesto orgánico de silicio, que contiene sólo los elementos más pesados del grupo 14, amplía el alcance de la química del ciclobutadieno.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química del silicio Química del silicio
- Coordinación Química de la Coordinación
Sus antecedentes:
- Los ligandos de ciclobutadieno son cruciales en la química organometálica, pero sus congéneres más pesados son menos explorados.
- La síntesis y caracterización de nuevos sistemas de ligandos son vitales para el avance de la química de coordinación.
- Los compuestos orgánicos de silicio ofrecen propiedades electrónicas y estéricas únicas para el diseño de ligandos.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo complejo aniónico de cobalto con un ligando tetrasilaciclobutadieno.
- Para investigar las características estructurales del ligando tetrasilaciclobutadieno en un complejo de cobalto.
- Explorar el potencial de los elementos más pesados del grupo 14 en la formación de ligandos similares al ciclobutadieno.
Principales métodos:
- Síntesis del complejo aniónico de cobalto [(R4Si4) Co(CO) 2) -.K+ (R = SiMe tBu2) por medio de la reacción de [R4Si4]2-.2K+ con CpCo(CO) 2.2.
- Análisis de difracción de rayos X del complejo para determinar su estructura molecular precisa.
- Preparación de las formas de aniones libres y diméricos utilizando diferentes contraiones y agentes de complicación.
Principales resultados:
- Síntesis exitosa del complejo aniónico tetrasilaciclobutadieno cobalto.
- El análisis de rayos X reveló un anillo Si4 plano y rectangular con sustituyentes de sililo en el plano.
- El fragmento de tetrasilaciclobutadieno se demuestra como un nuevo tipo de ligando para el cobalto, el primer análogo de ciclobutadieno con sólo los elementos más pesados del grupo 14.
Conclusiones:
- El ligando tetrasilaciclobutadieno representa un nuevo motivo estructural en la química organometálica.
- Este estudio proporciona el primer ejemplo de un ligando de ciclobutadieno compuesto enteramente de elementos más pesados del grupo 14.
- Los hallazgos abren nuevas vías para explorar la química de los elementos más pesados en complejos de coordinación.
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