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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Actividad quiróptica desde un marco metálico-orgánico biológico achiral
Li-Li Xu1,2, Hai-Feng Zhang1, Mian Li1
1Department of Chemistry , Shantou University , Guangdong 515063 , P. R. China.
Journal of the American Chemical Society
|August 25, 2018
Resumen
Las estructuras metal-orgánicas acirales (MOF) pueden exhibir actividad quiróptica debido a su simetría cristalina. Este estudio informa el primer MOF achiral, ZnFDCA, que demuestra este fenómeno raro.
Área de la Ciencia:
- Ciencias de los materiales
- La cristalografía
- Óptica
Sus antecedentes:
- La actividad quiróptica está típicamente asociada con moléculas quirales.
- Los cristales de Achiral que exhiben actividad óptica son teóricamente posibles, pero rara vez se observan.
- Las estructuras metal-orgánicas (MOF) ofrecen estructuras ajustables para explorar las propiedades de los materiales.
Objetivo del estudio:
- Investigar la actividad quiróptica en las estructuras metálico-orgánicas achirales (MOF).
- Para demostrar el primer ejemplo de un MOF aciral ópticamente activo.
- Explorar la relación entre la simetría cristalina y las propiedades quirópticas en los MOF.
Principales métodos:
- Síntesis de MOFs que contienen adenina (ZnFDCA y ZnFDCA-NH2).
- Caracterización de la estructura cristalina y la simetría.
- Medición de las señales de dicroísmo circular (CD) para evaluar la actividad quiróptica.
Principales resultados:
- El MOF achiral ZnFDCA exhibió una actividad quiróptica distinta, evidenciada por fuertes señales de CD opuestas.
- Esta actividad se atribuye a la simetría cristalina intrínseca de 4̅2 m del ZnFDCA.
- La modificación del MOF (ZnFDCA-NH2) condujo a una estructura cristalina centrosimétrica, eliminando la actividad óptica quiróptica y no lineal.
Conclusiones:
- Los MOF de Achiral pueden mostrar actividad quiróptica, desafiando el entendimiento convencional.
- La simetría cristalina es un determinante crítico de las propiedades quirópticas en los materiales achirales.
- El ZnFDCA representa una nueva clase de materiales con aplicaciones potenciales en tecnologías ópticas.
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