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De las nanopartículas metálicas racémicas a los enantiómeros ópticamente puros en una olla

Huayan Yang¹, Juanzhu Yan¹, Yu Wang¹

¹State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, China.

Journal of the American Chemical Society

|October 21, 2017

Resumen

Los investigadores desarrollaron un nuevo método para crear nanocúmulos de plata quirales atómicamente precisos. Esta estrategia utiliza ligandos quirales específicos para lograr una pureza óptica del 100% en los nanocúmulos de metales nobles.

Área de la Ciencia:

Ciencias de los materiales
Nanotecnología
Química inorgánica

Sus antecedentes:

Los nanocúmulos atómicamente precisos ofrecen propiedades únicas debido a su estructura definida.
Lograr la quiralidad intrínseca en los nanocúmulos metálicos es un desafío, pero crucial para aplicaciones como la catálisis enantioselectiva.

Objetivo del estudio:

Desarrollar una estrategia general para sintetizar nanoagrupaciones de metales nobles intrínsecamente quirales y atómicamente precisas.
Demostrar el uso de ligandos quirales de difosfina para la síntesis enantioselectiva.

Principales métodos:

Utilizando un enfoque de ligando mixto con difosfinas achirales (DPPP) y quirales (BDPP).
Síntesis de nanoagrupaciones de plata con la fórmula general [Ag78 (difosfina) 6 (SR) ].
Caracterizar los nanocúmulos resultantes para las propiedades estructurales y ópticas.

Principales resultados:

Se han sintetizado con éxito nanocúmulos de plata intrínsecamente quirales [Ag78 ((R/S-BDPP)) 6 ((SR)) ] con una pureza óptica del 100%.
Se han identificado motivos asimétricos de coordinación superficial (R3PAg(SR) 3) inducidos por ligandos quirales.
Se demostró que la flexibilidad del ligando de difosfina dicta la selección enantiomérica.

Conclusiones:

Una nueva estrategia de prueba de concepto permite la síntesis enantioselectiva de nanocúmulos quirales ópticamente puros y atómicamente precisos.
Este método abre posibilidades para crear nanoagrupaciones quirales de metales nobles para aplicaciones específicas.

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