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Síntesis de plantillas y propiedades del magnetismo de una sola molécula de un complejo con espín S = 16 y un núcleo
Anastasios J Tasiopoulos1, Wolfgang Wernsdorfer, Brian Moulton
1Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, USA.
Journal of the American Chemical Society
|December 11, 2003
Resumen
Los investigadores sintetizaron un nuevo compuesto de manganeso y cerio, logrando el espín más alto (S = 16) para un grupo de manganeso. Este avance lo establece como el más alto espín del imán de una sola molécula (SMM) descubierto hasta la fecha.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
- El magnetismo es el magnetismo.
Sus antecedentes:
- Los cúmulos de manganeso-oxígeno son de interés por sus propiedades magnéticas.
- Los imanes de una sola molécula (SMM) requieren altos estados de espín para aplicaciones potenciales.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo compuesto de racimo de Ce-Mn.
- Para investigar las propiedades magnéticas y el estado básico del nuevo compuesto.
- Para determinar si el compuesto exhibe un comportamiento magnético de una sola molécula.
Principales métodos:
- Síntesis de plantillas utilizando un polímero en cadena {[MnIII(OH) ((O2CMe) ] . (MeCO2H). también conocido como MeCO2H. (H2O) n y Ce (IV).
- Difracción de rayos X monocristalino para la determinación estructural.
- Estudios de magnetización y susceptibilidad magnética para sondear el comportamiento magnético.
Principales resultados:
- Se sintetizó con éxito un nuevo compuesto [CeIVMnIII8O8(O2CMe) 12(H2O) 4].4H2O (1.4H2O).
- La estructura se caracteriza por un bucle MnIII8 que encapsula un ion.Ce(IV) en la estructura.
- Los estudios magnéticos revelaron un estado de tierra de espín récord de S = 16 para un cúmulo de Mn.
- El compuesto exhibe relajación de magnetización lenta e histeresis, características de los SMM.
Conclusiones:
- El cúmulo de Ce-Mn sintetizado representa el cúmulo de manganeso de espín más alto reportado.
- Este compuesto es el más alto espín del imán de una sola molécula (SMM) descubierto hasta la fecha.
- Los hallazgos abren nuevas vías para el diseño de SMM de alto giro con posibles aplicaciones tecnológicas.
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