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Metátesis de expansión de anillo Polimerización bajo confinamiento

Patrick Probst1, Moritz Lindemann1, Johanna R Bruckner2

  • 1Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart 70569, Germany.

Journal of the American Chemical Society
|February 26, 2025

Ver abstracta en PubMed

Resumen
Este resumen es generado por máquina.

La inmovilización de un complejo de molibdeno en sílice mesoporosa ordenada mejora la polimerización de la metástasis de expansión de anillo. Este confinamiento permite la síntesis de polímeros cíclicos de bajo peso molecular con estereoselectividad controlada.

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Área de la Ciencia:

  • Química organometálica
  • Química de los polímeros
  • Ciencias de los materiales

Sus antecedentes:

  • La catálisis utilizando complejos de metales de transición es crucial para la síntesis de polímeros.
  • El confinamiento de catalizadores dentro de materiales porosos puede alterar la reactividad y la selectividad.
  • La sílice mesoporosa ordenada (OMS) ofrece tamaños de poro ajustables para la inmovilización del catalizador.

Objetivo del estudio:

  • Para inmovilizar un complejo de molibdeno alquilídido catiónico N-heterocíclico (NHC) dentro de OMS.
  • Investigar el efecto del confinamiento de los poros en la polimerización de la metátesis de expansión de anillo (REMP) de las olefinas cíclicas.
  • Explorar la influencia del confinamiento en el peso molecular del polímero y la estereoselectividad.

Principales métodos:

  • Síntesis y caracterización del complejo NHC de molibdeno [Mo ((C-p-OMeC6H4) ((OCMe ((CF3) 2) 2 ((IMes)) ] B ((ArF4).
  • Inmovilización del complejo en OMS con diferentes tamaños de poros (66, 56 y 28 Å).
  • Polymerización por metástasis de expansión de anillo (REMP) de olefinas cíclicas que incluyen cis-ciclocteno (cCOE), 1,5-cicloctadieno (COD), (+) -2,3-endo, exo-dicarbomethoxynorborn-5-eno ((+) -DCMNBE), y 2-metil-2-fenilcicloprop-1-eno (MPCP).
  • Análisis de productos poliméricos mediante espectrometría de masas por desorción láser y tiempo de vuelo (MALDI-TOF).

Principales resultados:

  • Inmovilización selectiva del complejo de molibdeno dentro de los poros de la OMS.
  • Observación de un fuerte efecto de confinamiento en la REMP, que conduce a polímeros cíclicos de bajo peso molecular incluso en altas concentraciones de monómeros.
  • Formación exclusiva de polímeros cíclicos confirmada por el MALDI-TOF.
  • Mejora inducida por el confinamiento de la Z-selectividad y la cis-sindiospecificidad.

Conclusiones:

  • El confinamiento de catalizadores de NHC de molibdeno en OMS es una estrategia eficaz para controlar la REMP.
  • El tamaño de los poros de OMS influye significativamente en el resultado de la polimerización, lo que permite la síntesis de polímeros cíclicos con propiedades personalizadas.
  • Este enfoque ofrece una vía para controlar con precisión la arquitectura del polímero y la estereoquímica a través del confinamiento del catalizador.