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Nanocúmulo superatómico de ocho electrones Cu31 con núcleo quiral y emisión NIR-II
Tao Jia1, Zong-Jie Guan2, Chengkai Zhang3
1School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, People's Republic of China.
Journal of the American Chemical Society
|April 27, 2023
Resumen
Los investigadores sintetizaron un nuevo nanocúmulo de cobre superatómico de ocho electrones, el primero de su tipo. Este nanocúmulo de cobre único exhibe absorción y emisión en el infrarrojo cercano, mostrando una promesa para aplicaciones biológicas.
Área de la Ciencia:
- Química inorgánica
- Ciencias de los materiales
- Nanotecnología
Sus antecedentes:
- Los nanocúmulos de cobre son menos comunes que la plata o el oro debido a la inestabilidad inherente.
- El bajo potencial de reducción de la media célula Cu ((I) / Cu ((0) desafía la formación de nanocúmulos que contienen Cu ((0).
Objetivo del estudio:
- Para sintetizar y caracterizar estructuralmente un nuevo nanocúmulo de cobre superatómico de ocho electrones.
- Investigar las propiedades electrónicas y ópticas únicas del nanocúmulo de cobre sintetizado.
- Para explorar el potencial de este nanocúmulo de cobre en aplicaciones biológicas.
Principales métodos:
- Caracterización estructural total del nanocúmulo de cobre.
- Espectrometría de masas de ionización por electrospray (ESI-MS).
- Espectroscopia de fotoelectrones de rayos X (XPS por sus siglas en inglés).
- Cálculos de la teoría funcional de la densidad (DFT).
Principales resultados:
- Se sintetizó y caracterizó un nuevo nanocúmulo de cobre superatómico de ocho electrones, [Cu31 ((4-MeO-PhCC) 21 ((dppe) 3) ((ClO4) 2).
- El nanocúmulo posee un núcleo metálico quiral con una disposición helicoidal única de unidades Cu2 alrededor de un núcleo Cu13.
- Muestra la primera absorción observada en el infrarrojo cercano (NIR-I) y la segunda emisión en el infrarrojo cercano (NIR-II) en nanocúmulos de cobre.
- Los grupos 4-metoxi en los ligandos son cruciales para la formación de racimos y la cristalización.
Conclusiones:
- Este trabajo presenta un nuevo miembro de la familia de los superátomos de cobre con propiedades electrónicas sin precedentes.
- El nanocúmulo de cobre sintetizado demuestra un potencial significativo para aplicaciones biológicas debido a sus propiedades ópticas NIR.
- Los nanocúmulos de cobre, anteriormente considerados no luminosos en el rango visible, pueden exhibir una profunda luminiscencia NIR.
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