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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
Published on: February 11, 2012
"n-Doping" de los iones deltaédricos de Zintl
Miriam M Gillett-Kunnath1, Allen G Oliver, Slavi C Sevov
1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.
Journal of the American Chemical Society
|April 12, 2011
Resumen
Los investigadores han desarrollado un nuevo método para sustituir los átomos de germanio en los racimos Ge(9)(4-) por antimonio o bismuto. Este proceso produce nuevos iones deltaédricos de Zintl "n-dopados", expandiendo las posibilidades en la química de clúster.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
- Química de clúster La química de clúster es la química de los clústers.
Sus antecedentes:
- Los iones deltaédricos de Zintl, como Ge(9)(4-), son bloques de construcción fundamentales en la química de racimos.
- Los métodos anteriores permitían la mono- y disubstición del germanio con antimonio (Sb) o bismuto (Bi) a temperatura ambiente.
- El control limitado sobre el alcance y la posición de la sustitución en los grupos de germanio era un desafío conocido.
Objetivo del estudio:
- Desarrollar un método sencillo y eficiente para reemplazar los átomos de germanio en los cúmulos Ge ((9) ((4-)) con Sb o Bi.
- Para explorar la formación de nuevos iones Zintl deltaédricos sustituidos bajo condiciones de reacción modificadas.
- Caracterizar las estructuras de los grupos de germanio sustituidos por antimonio y bismuto recién sintetizados.
Principales métodos:
- Reacciones de los grupos Ge(9)(4-) con la trifenilstibina (Ph(3) Sb) y la trifenilbismutina (Ph(3) Bi).
- Aplicación de temperaturas elevadas y sonorización para facilitar el intercambio atómico.
- Caracterización estructural de los grupos resultantes utilizando cristalografía de rayos X y otras técnicas analíticas.
Principales resultados:
- A temperaturas elevadas o con sonorización, los racimos Ge(9)(4-) experimentan un intercambio de átomos de germanio con Sb o Bi.
- Se sintetizaron y caracterizaron estructuralmente nuevos iones de Zintl deltaédricos n-dopados, entre los que se incluyen los iones [(EGe(8)) -(Ge(8) E) ](4-), (Sb(2) Ge(7))(2-), y [(SbGe(8)) -SbPh(2) ](2-).
- Estos resultados demuestran una nueva vía para la creación de grupos Zintl sustituidos con aplicaciones electrónicas potenciales.
Conclusiones:
- Se ha establecido un método fácil y eficaz para la síntesis de grupos de germanio Sb- y Bi-sustituido.
- El estudio produjo con éxito nuevos iones deltaédricos n-dopados de Zintl, expandiendo la familia conocida de compuestos de racimo.
- Este trabajo proporciona nuevas vías para el diseño y la síntesis de materiales avanzados basados en marcos de clúster Zintl.
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