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Cúmulos de lantánidos ricos en calcógeno: reactividad del cúmulo y la influencia de los ligandos auxiliares en la
A Y Kornienko1, T J Emge, J G Brennan
1Department of Chemistry, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA.
Journal of the American Chemical Society
|November 29, 2001
Resumen
Se sintetizaron complejos de iterbio con ligandos de selenio y azufre, revelando estructuras cuadradas y romboédricas únicas. Estos grupos exhiben fácil interconversión y pueden descomponerse en materiales de selenuro de iterbio.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química organometálica Química orgánica de los metales.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los complejos de iterbio son de interés por sus propiedades electrónicas y estructurales únicas.
- La síntesis de nuevos clústeres con ligandos calcogénidos puede dar lugar a nuevos materiales con propiedades sintonizables.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos grupos de calogenuro de itérbio.
- Investigar la diversidad estructural y la reactividad de estos grupos.
- Para explorar su potencial como precursores de materiales de selenuro de iterbio.
Principales métodos:
- Reacción del metal iterbio con PhEEPh (E = S, Se, Te) y el elemento Se en la piridina.
- Análisis de cristalización y difracción de rayos X para determinar las estructuras de los grupos resultantes.
- Investigación de las reacciones de interconversión de clúster y termólisis.
Principales resultados:
- Se sintetizaron tres nuevos grupos de itérbio: (piridina) ((8) Yb ((4) SeSe) ((2) Se) ((2) Mu ((2) -SPh) ((2) SPh) ((2), (py) ((8) Yb ((4) SeSe) ((3) SeSeSeSePh) ((((0.38) SePh), y (py) ((8) Yb ((4) SeSe) ((3) SeSeTeTe) (((SeTePh).
- Los compuestos SePh y TePh presentan una matriz cuadrada de iones Yb (((III) alrededor de un ligando central Se (((2) ((-), con variaciones en la coordinación y enlace del ligando.
- El compuesto tiolato exhibe una disposición romboédrica de iones Yb(III) puenteados por ligandos Se(2)(-) y atravesados por diselenido y ligandos SPh.
- Se observó una fácil interconversión entre estructuras de racimo, y la termólisis produjo materiales de selenuro de iterbio.
Conclusiones:
- Se han establecido nuevas rutas sintéticas para los grupos de calogenuro de iterbio.
- La diversidad estructural surge de la naturaleza del ligando orgánico y la fuerza del enlace Yb-E.
- Estos grupos representan precursores prometedores para la síntesis controlada de nanomateriales de selenuro de iterbio.
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