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Observación de un cruce de espín Fe (II) en un hexacianocromato de hierro y cesio

Wataru Kosaka¹, Kiyoshi Nomura, Kazuhito Hashimoto

¹Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Journal of the American Chemical Society

|June 16, 2005

Resumen

Los investigadores observaron un fenómeno de cruce de espín en un hexacianocromato de hierro de cesio, un análogo azul prusiano. Este cruce de espín FeII implica una transición de fase térmica y una contracción de celosía, lo que marca una primicia para esta clase de materiales.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Química del estado sólido.
El magnetismo es el magnetismo.

Sus antecedentes:

Los análogos azules prusianos son compuestos de coordinación con diversas propiedades magnéticas y electrónicas.
El cruce de espín (SCO) es un fenómeno en el que un ion metálico cambia su estado de espín en respuesta a estímulos externos.
El spin-crossover del hierro (II) (FeII) ha sido explorado en varios entornos de coordinación.

Objetivo del estudio:

Para investigar el fenómeno del cruce de espín en el hexacianocromato de hierro de cesio, un análogo azul prusiano.
Para caracterizar la transición de fase térmica asociada con el cruce de espín.
Para determinar los cambios estructurales que acompañan a la transición de giro-cruzamiento.

Principales métodos:

Síntesis de hexacianocromato de hierro y cesio.
Mediciones de susceptibilidad magnética de temperatura variable para detectar el cruce de espín.
Difracción de rayos X para analizar los cambios estructurales durante la transición de fase.

Principales resultados:

Observación de un fenómeno de cruce de espín en el hexacianocromato de hierro de cesio.
Se identificó una transición de fase térmica distinta con temperaturas de transición en 211 K (hacia abajo) y 238 K (hacia arriba).
La transición de giro-cruce se acompaña de una contracción significativa de la red (0,38 Å) mientras se preserva la estructura cúbica centrada en la cara (Fm3m).

Conclusiones:

Este estudio reporta la primera observación de FeII spin-crossover en esta serie de análogos azules prusianos.
El spin-crossover observado y los cambios estructurales asociados ofrecen información sobre la capacidad de sintonización de los análogos azules prusianos para aplicaciones potenciales.
El hexacianocromato de hierro de cesio sirve como una nueva plataforma para estudiar los fenómenos de cruce de espín en los materiales de coordinación.

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