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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Cuadros orgánicos covalentes reconstruidos

Weiwei Zhang1, Linjiang Chen1,2, Sheng Dai1

  • 1Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China.

Nature
|April 7, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo método para crear marcos orgánicos covalentes altamente cristalinos (COF) utilizando la reconstrucción del marco. Esta técnica mejora la estabilidad y la porosidad de los COF, mejorando su rendimiento en aplicaciones como la fotocatálisis.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química orgánica
  • Nanotecnología

Sus antecedentes:

  • Los marcos orgánicos covalentes (COF) ofrecen propiedades ajustables, pero lograr una alta cristalinidad y estabilidad es un desafío debido a la escasa reversibilidad en las reacciones de formación de marcos.
  • Los métodos existentes que utilizan la química reversible a menudo dan lugar a COF con estabilidad comprometida y aplicaciones limitadas.
  • Los FOC robustos y altamente cristalinos son deseables para aplicaciones avanzadas, especialmente en catálisis y conversión de energía.

Objetivo del estudio:

  • Desarrollar un protocolo general y escalable para la síntesis de COFs de imina robustos y altamente cristalinos.
  • Investigar una nueva estrategia de reconstrucción del marco para mejorar las propiedades del COF.
  • Demostrar el rendimiento mejorado de los FOC reconstruidos en aplicaciones fotocatalíticas.

Principales métodos:

  • Un nuevo protocolo de síntesis que incluye la preorganización de monómeros utilizando ataduras covalentes reversibles.
  • Polimerización confinada después de la preorganización del monómero para lograr la reconstrucción del marco.
  • Procedimiento sintético sin vacío para la preparación de COF.

Principales resultados:

  • Se han preparado con éxito FOC de imina robusta y de alta cristalinidad a través de una vía de reconstrucción de marco.
  • Se obtiene un aumento significativo de la cristalinidad y la porosidad en los FOC reconstruidos en comparación con los métodos estándar.
  • Se ha demostrado una mejora del transporte del portador de carga en los COF reconstruidos, lo que lleva a altas tasas de evolución de hidrógeno fotocatalítico (hasta 27,98 mmol h−1 g−1).

Conclusiones:

  • La estrategia de reconstrucción asistida por nanoconfinamiento proporciona un método general y escalable para producir COF de alta calidad.
  • La mejora de la cristalinidad y la porosidad de los COF reconstruidos conduce a un rendimiento superior en la evolución del hidrógeno fotocatalítico.
  • Este enfoque representa un paso importante hacia el control preciso de la estructura y la función del material orgánico.