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Co ((3) [Co ((CN) ((5)) ] ((2)): un imán microporoso con una temperatura de orden de 38 K
Laurance G Beauvais1, Jeffrey R Long
1Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
Journal of the American Chemical Society
|October 10, 2002
Resumen
Un nuevo compuesto de cyanuro de cobalto, análogo azul prusiano, exhibe ferrimagnetismo y microporosidad. La deshidratación mejora las propiedades magnéticas, lo que demuestra la coexistencia de la porosidad y el ordenamiento magnético en este nuevo material.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
- Química del estado sólido.
Sus antecedentes:
- Los análogos azules prusianos son conocidos por sus diversas propiedades magnéticas y estructurales.
- Los materiales microporosos son cruciales para las aplicaciones de almacenamiento y separación de gases.
- La síntesis y caracterización de nuevos materiales con propiedades combinadas son de gran interés.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo compuesto de cyanuro de cobalto.
- Investigar las propiedades magnéticas y estructurales del compuesto sintetizado y su forma deshidratada.
- Explorar el potencial para la coexistencia de microporosidad y ordenamiento magnético.
Principales métodos:
- Reacción de [Co(H2O) 6) 2+ y [Co(CN) 5) 3 - en agua desoxigenada.
- Difracción de polvo de rayos X para el análisis estructural.
- Isotermas de sorción de dinitrógeno para determinar la porosidad.
- Mediciones magnéticas (susceptibilidad dependiente de la temperatura, bucles de histeresis) para sondear el comportamiento magnético.
Principales resultados:
- Se sintetizó un marco cúbico de tipo azul prusiano, Co3[Co(CN) 5]2.8H2O.
- El compuesto es microporoso, conservando su cristalinidad tras la deshidratación.
- El material exhibe ferrimagnetismo con un alto campo coercitivo (1160 G) e histeresis magnética.
- La deshidratación conduce a una disminución en la temperatura de ordenamiento magnético, pero retiene la histeresis.
Conclusiones:
- El compuesto de cyanuro de cobalto sintetizado es un nuevo análogo azul prusiano con un marco cúbico.
- El Co3 deshidratado[Co(CN) ]5 2 exhibe tanto microporosidad como ordenamiento magnético de largo alcance.
- Este trabajo presenta el primer ejemplo de un compuesto que demuestra la coexistencia de estas dos propiedades en un análogo azul prusiano cúbico.
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