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Transformación estructural impulsada por isomerización fotoinducida entre el oro decanuclear y el oro octadecanuclear
Liao-Yuan Yao1, Vivian Wing-Wah Yam1
1Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
Journal of the American Chemical Society
|March 6, 2015
Resumen
La isomerización del ligando inducida por la fotoirradicación en grupos de sulfuro de oro, transformando un grupo de decagold en un grupo de octadecagold con propiedades fotofísicas distintas.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
- La fotoquímica es la fotoquímica.
Sus antecedentes:
- Los grupos de sulfuro de oro polinuclear (I) son conocidos por sus propiedades estructurales y fotofísicas únicas.
- La isomerización de ligandos puede influir en la nuclealidad y la simetría de los grupos metálicos.
- Comprender estas transformaciones es clave para diseñar nuevos materiales funcionales.
Objetivo del estudio:
- Investigar las consecuencias estructurales y fotofísicas de la isomerización de ligandos en grupos de sulfido de oro polinuclear.
- Para caracterizar la transformación de un decagold (I) a un octadecagold (I) grupo.
- Explorar el papel del enlace oro-oro en la estabilidad y propiedades del clúster.
Principales métodos:
- Fotorradiación de los ligandos cis-1,2-bis ((difenilfosfino) eteno (dppee) dentro de los grupos de oro ((I) sulfido.
- Caracterización mediante RMN, espectrometría de masas, análisis elemental y difracción de rayos X de un solo cristal.
- El monitoreo de la transformación en solución a través de la absorción UV-vis, la emisión y la espectroscopia de RMN 31P.
Principales resultados:
- La isomerización cis-trans de los ligandos dppee inducida por la fotoirradiación.
- Esta isomerización desencadenó una transformación estructural de un clúster decagold a un clúster octadecagold.
- Los grupos resultantes exhibieron significativamente diferentes comportamientos fotofísicos debido a las variaciones en la nuclealidad y la simetría.
- Las interacciones del oro fueron cruciales para estabilizar los clústeres.
Conclusiones:
- La isomerización de ligandos es una vía viable para inducir transformaciones estructurales en grupos de sulfuro de oro polinuclear.
- La transformación conduce a distintas propiedades fotofísicas, ofreciendo potencial para materiales sensibles a la luz.
- El estudio pone de relieve la importancia de las interacciones supramoleculares en la química de clúster.
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