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Control supramolecular de las nanopartículas de cambio de azobenzeno
Zonglin Chu1, Yanxiao Han2, Tong Bian1
1Department of Organic Chemistry , Weizmann Institute of Science , Rehovot 76100 , Israel.
Journal of the American Chemical Society
|January 1, 2019
Resumen
Los investigadores desarrollaron nanopartículas de azobenzeno solubles en agua mediante su coadsorción con ligandos solubilizadores. Este avance permite que los nanomateriales controlados por la luz en entornos acuosos superen las limitaciones anteriores de los disolventes orgánicos.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- La fotoquímica
Sus antecedentes:
- La fotoisomerización del azobenzeno permite el control de la luz sobre las propiedades del material.
- La hidrofobia del azobenzeno limita las aplicaciones en medios acuosos.
- El desarrollo de sistemas fotorresponsivos compatibles con el agua es crucial para aplicaciones más amplias.
Objetivo del estudio:
- Para crear nanomateriales a base de azobenzeno solubles en agua.
- Investigar el efecto de los ligandos coadsorbidos en la solubilidad del azobenzeno y la fotoisomerización.
- Explorar el potencial de sistemas sensibles a la luz en entornos acuosos y biológicos.
Principales métodos:
- Funcionalización de las nanopartículas con azobenzenos y ligandos solubles en agua.
- Control preciso de la relación entre el azobenzeno y los ligandos de fondo.
- Simulaciones de dinámica molecular para comprender la arquitectura de las nanopartículas.
- Estudios de fotoisomerización bajo exposición a rayos UV y luz visible.
Principales resultados:
- Se ha logrado una excelente solubilidad en agua para las nanopartículas funcionalizadas con azobenzeno.
- Se han identificado distintas arquitecturas supramoleculares que influyen en la solubilidad.
- Se ha demostrado una fotoisomerización altamente reversible en agua.
- Se demostró que los ligandos de fondo tienen un impacto significativo en la cinética de conmutación del azobenzeno, con un ligando acelerando una reacción más de 6000 veces.
Conclusiones:
- La coadsorción de azobenzos con ligandos solubilizantes crea efectivamente nanomateriales fotorresponsivos solubles en agua.
- La elección del ligando de fondo influye críticamente en la dinámica de la fotoisomerización.
- Este enfoque permite el desarrollo de nuevos nanomateriales sensibles a la luz para aplicaciones acuosas y potencialmente biológicas.
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