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Clusters de "escobillas" de lantanoides: estructuras de núcleo de metal-oxo notablemente alargadas con longitudes
Daniel D'Alessio1, Alexandre N Sobolev, Brian W Skelton
1Department of Chemistry, Curtin University , Bentley, Western Australia 6102, Australia.
Journal of the American Chemical Society
|October 7, 2014
Resumen
Los investigadores crearon nuevos grupos de metal-oxo en forma de varilla, superando las típicas formas esféricas. Este avance en la química de los lantanoides permite longitudes de racimo sintonizables mediante la modificación de co-ligandos, abriendo nuevas posibilidades de materiales.
Área de la Ciencia:
- Coordinación Química de la Coordinación
- Ciencia de los materiales Ciencia de los materiales.
- Química de los Lantanoides
Sus antecedentes:
- Los grandes grupos de metal-oxo generalmente forman estructuras esféricas o poliédricas.
- Lograr clusters de metal-oxo de alto índice de aspecto o alargados sigue siendo un desafío sintético.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos grupos alargados de metal-oxo.
- Explorar la influencia de los co-ligandos en la morfología y longitud del racimo.
Principales métodos:
- Reacción de sales de lantanoides con un calixareno funcionalizado con tetrazol.
- La inclusión de un coligando carboxilato para dirigir la formación de racimos.
- Caracterización estructural de los grupos Ln19 y Ln12 resultantes.
Principales resultados:
- Se han sintetizado con éxito racimos alargados de metal-oxo (Ln19 y Ln12).
- Los cúmulos están construidos a partir de bipirámides trigonales Ln5O6 fusionadas en el ápice.
- La longitud del clúster se controla de manera confiable mediante la alteración de la estructura del coligando carboxilato.
Conclusiones:
- Demostró un nuevo método para acceder a racimos de metal-oxo en forma de varilla.
- Estableció una estrategia para ajustar las dimensiones del racimo a través del diseño de coligando.
- Se abrieron caminos para el desarrollo de nuevos materiales funcionales basados en racimos alargados de metal-oxo.
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