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Imágenes del conjunto toroide Ce70 de sólidos y soluciones

Ian Colliard¹, Jessica C Brown¹, Dylan B Fast¹

¹Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States.

Journal of the American Chemical Society

|June 17, 2021

Resumen

Los investigadores estudiaron la cristalización de nuevos grupos de cerio (Ce), revelando mecanismos de ensamblaje modular. Estos grupos de Ce muestran potencial para aplicaciones ambientales y energéticas debido a sus propiedades de ensamblaje y intercambio iónico rápidos.

Área de la Ciencia:

Química inorgánica
Ciencias de los materiales
La cristalografía

Sus antecedentes:

La cristalización en las interfaces sólido-líquido es difícil de observar y controlar a nivel molecular.
El grupo Ce70-torroid, [Ce70 ((OH) 36 ((O) 64 ((SO4) 60 ((H2O) 10) 4-, es parte de una familia de materiales emergentes MIV70 (M = Zr, U, Ce).

Objetivo del estudio:

Para aclarar los mecanismos de ensamblaje del grupo Ce70-torroid.
Para entender la formación de los fragmentos y sus unidades de construcción.
Explorar las aplicaciones potenciales de esta familia de materiales emergentes.

Principales métodos:

Diseminación de rayos X (diseminación de ángulo pequeño y total) de soluciones y sólidos.
Difracción de rayos X de un solo cristal para identificar fragmentos de Ce70.
Observación de ensamblajes rápidos a temperatura ambiente inducidos por Li+ y NH4+.

Principales resultados:

Los mecanismos de ensamblaje se aclararon a través de la dispersión y difracción de rayos X.
Se ha identificado un crecimiento templado (Ce5) y un ensamblaje modular a partir de unidades hexámeras (Ce6) que conducen a grupos más grandes (Ce13, Ce62).
Ce62 forma arcos entrelazados a través de enlaces de hidrógeno con NH4+, un nuevo motivo estructural inorgánico.

Conclusiones:

El Ce70-torroid y sus fragmentos exhiben un montaje modular de unidades de construcción más pequeñas.
El rápido ensamblaje de Ce62 con cationes de amonio y las propiedades de intercambio iónico/redox de estos materiales sugieren potencial en aplicaciones ambientales y energéticas.

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