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Estructura cristalina y propiedades ópticas de un cúmulo quiral de tiolato/stibina protegido
Justin B Patty1, Shana Havenridge2, Dylan Tietje-Mckinney1
1Department of Chemistry, Southern Methodist University, Dallas, Texas 75275, United States.
Journal of the American Chemical Society
|December 27, 2021
Resumen
Los investigadores sintetizaron un nuevo clúster de oro quiral, Au18 ((S-Adm) 8 ((SbPh3) 4Br2, con una cáscara de ligando mixta única de tiolato y estibina. Este cúmulo de oro quiral exhibe propiedades estructurales y electrónicas distintas en comparación con los cúmulos de oro achiral estudiados anteriormente.
Área de la Ciencia:
- Química inorgánica
- Ciencias de los materiales
- Nanotecnología
Sus antecedentes:
- Los cúmulos de oro son de interés debido a sus propiedades ópticas y electrónicas únicas.
- Los grupos de oro protegidos por monocapa (MPC) ofrecen propiedades sintonizables basadas en la elección del ligando.
- La quiralidad en los nanomateriales puede conducir a nuevas aplicaciones en catálisis y detección.
Objetivo del estudio:
- Informar sobre la primera síntesis y caracterización de una mezcla quiral de oro protegida con tiolato y estibina.
- Para aclarar el origen estructural de la quiralidad en el cúmulo de oro sintetizado.
- Investigar las propiedades únicas y la estabilidad de este nuevo grupo de ligandos de oro.
Principales métodos:
- Cristalografía de rayos X de cristal único para una determinación estructural precisa.
- Síntesis de racimos de oro con tiolatos mixtos (1-adamantanetiolato) y ligandos de estibina.
- Análisis computacional de las estructuras geométricas y electrónicas.
Principales resultados:
- Síntesis exitosa y caracterización estructural de Au18 ((S-Adm) 8 ((SbPh3) 4Br2, el primer clúster de oro mixto quiral protegido por tiolato y estibina.
- La quiralidad se origina en la disposición de motivos de grapas en un núcleo Au13 y una tapa de ligando.
- El nuevo grupo presenta características estructurales y electrónicas distintas en comparación con sus contrapartes arquiales.
Conclusiones:
- El estudio presenta un nuevo cúmulo quiral de oro con una cáscara de ligandos mixtos, ampliando la diversidad de estructuras de cúmulo accesibles.
- Comprender las relaciones estructura-propiedad en estos sistemas de ligandos mixtos es crucial para el diseño de nanomateriales funcionales.
- Este trabajo proporciona información sobre la reactividad y la estabilidad de los grupos de oro mixtos quirales protegidos por una sola capa.
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