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Observación del isomerismo de interpenetración en marcos orgánicos covalentes
Tianqiong Ma1,2, Jian Li2, Jing Niu1
1State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou , Gansu 730000 , China.
Journal of the American Chemical Society
|May 22, 2018
Resumen
Los investigadores descubrieron el primer caso de isomerismo de interpenetración en marcos orgánicos covalentes (COF). Se sintetizó un nuevo isómero 7 veces interpenetrado de COF-300, ampliando la comprensión de estos materiales avanzados.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- La cristalografía
Sus antecedentes:
- Las estructuras orgánicas covalentes (COF) son polímeros porosos cristalinos.
- La interpenetración es una característica estructural común en los FOC tridimensionales (3D).
- Anteriormente se informó de COF-300, una estructura de diamante interpenetrada de 5 veces (topología dia-c5).
Objetivo del estudio:
- Informar sobre el primer ejemplo de isomerismo de interpenetración en COF.
- Para sintetizar y caracterizar un nuevo isómero de interpenetración de COF-300.
- Proponer un método para determinar el grado de interpenetración en los COF basados en dia.
Principales métodos:
- Síntesis de COF-300 con un paso de envejecimiento añadido.
- Análisis por difracción de rayos X en polvo (PXRD).
- Análisis por difracción de electrones de rotación (RED).
Principales resultados:
- Formación de un nuevo isómero 7 veces interpenetrado de COF-300, denominado dia-c7 COF-300.
- Confirmación estructural de la interpenetración de 7 veces usando PXRD y RED.
- Propuesta de una fórmula universal para el cálculo de los grados de interpenetración en los COF basados en dia a partir de los parámetros de la célula unitaria y la longitud del enlace.
Conclusiones:
- Este estudio presenta el primer caso documentado de isomerismo de interpenetración en marcos orgánicos covalentes.
- El descubrimiento de dia-c7 COF-300 amplía la diversidad estructural conocida de los COF 3D.
- La fórmula desarrollada ofrece una herramienta valiosa para predecir y comprender las estructuras de los FOC relacionados.
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