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Updated: May 26, 2025

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Síntesis y actividad catalítica del complejo de nitruro de torio a partir de la reducción de nitrógeno

Weiming Sheng¹, Thayalan Rajeshkumar², Qianyi Zhao³

¹State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.

Journal of the American Chemical Society

|February 24, 2025

Resumen

Los investigadores aislaron un complejo de nitruro de torio mediante la escisión del enlace nitrógeno-nitrógeno en dinitrógeno (N₂). Este catalizador actínido convierte eficientemente el N2 en silalamina, avanzando la química de fijación del nitrógeno.

Área de la Ciencia:

Química inorgánica
Química organometálica
Catálisis

Sus antecedentes:

Los nitritos metálicos son intermedios cruciales en la conversión del nitrógeno (N₂) al amoníaco (NH₃).
La funcionalización eficiente de N₂ sigue siendo un desafío significativo en la química.

Objetivo del estudio:

Para aislar y caracterizar un nuevo complejo de torio con puente de nitruro multimetal.
Investigar la actividad catalítica de este complejo en la conversión N₂.

Principales métodos:

Síntesis de un complejo precursor del torio, {N[CH₂CH₂N-PⁱPr₂]₃ThCl}₂ (1).
Reducción del complejo 1 y del dicloruro de cromo (CrCl2) utilizando grafito de potasio (KC8) bajo una atmósfera N2.
Etiquetado isotópico con ¹⁵N₂ para trazar el origen del nitruro.

Principales resultados:

Aislamiento de un complejo de torio con puente de nitruro multimetal (2) mediante la escisión completa del enlace triple NN.
Confirmación de que el nitruro en el complejo 2 proviene de N₂ a través del etiquetado isotópico.
Demostración de la actividad catalítica, convirtiendo N₂ en silílamina con altos rendimientos (hasta 9,9 equiv por torio).

Conclusiones:

Este estudio informa del primer aislamiento de un complejo de nitruro de torio derivado de la reducción de N₂.
Los hallazgos presentan un raro ejemplo de funcionalización N₂ catalizada por un actinido.
El complejo presenta un potencial significativo para futuras aplicaciones en la fijación y catálisis del nitrógeno.

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