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Síntesis controlada de poliaminoboranos bien definidos a escala utilizando un catalizador robusto y eficiente

Claire N Brodie¹, Timothy M Boyd^1,2, Lia Sotorríos³

¹Department of Chemistry, University of York, Heslington, York YO31 1ES, U.K.

Journal of the American Chemical Society

|November 30, 2021

Resumen

Un nuevo precatalizador de rodio permite la síntesis selectiva de N-metilpoliaminoborane a través de la deshidropolimización. Este proceso implica la activación del catalizador, la deshidrogenación y la propagación de la cadena controlada, produciendo polímeros procesables.

Área de la Ciencia:

Química organometálica
Química de los polímeros
Catálisis

Sus antecedentes:

La síntesis de poliaminoboranos es crucial para los materiales avanzados.
La deshidropolimización ofrece una vía para estos polímeros, pero requiere catalizadores eficientes.

Objetivo del estudio:

Desarrollar un precatalizador tolerante al aire para la síntesis selectiva de N-metilpoliaminoborano.
Para aclarar el mecanismo catalítico y controlar las propiedades del polímero.

Principales métodos:

Estudios cinéticos
Análisis de la especiación
Cálculos de la teoría de la función de densidad (DFT)
Etiquetado isotópico
Análisis del anillo auditivo
Análisis térmico (TGA, DSC)

Principales resultados:

Un precatalizador de rodio tolerante al aire, [Rh (L) (NBD) ]Cl, produce selectivamente el N-metil poliaminoborano.
El catalizador activo Rh(L) H3 se forma durante un período de inducción.
Un ligando cooperativo facilita la deshidrogenación, lo que lleva a la propagación en cadena.
Se obtuvieron polímeros de alto peso molecular con pesos moleculares controlables.
Los poliaminoboranos exhiben una ventana de procesamiento para varias técnicas de fabricación.

Conclusiones:

El estudio presenta un sistema catalítico robusto para la síntesis de poliaminoborano.
El mecanismo implica la activación del catalizador, la deshidrogenación templada y la propagación controlada.
Los polímeros resultantes son procesables en diversas formas, lo que pone de relieve su potencial material.

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