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Determinaciones de polos magnéticos y robustez del efecto de memoria tras la solubilización en un imán de iones
Tamyris T da Cunha1, Julie Jung, Marie-Emmanuelle Boulon
1Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1 , 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France.
Journal of the American Chemical Society
|October 17, 2013
Resumen
El complejo [Dy(tta) 3(L) ] actúa como un imán de un solo ión tanto en estado sólido como en estado disuelto. Este material magnético robusto conserva su efecto de memoria en solución hasta 4 K.
Área de la Ciencia:
- Coordinación Química de la Coordinación
- Magnetoquímica es la Magnetoquímica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los imanes de iones individuales (SIM) son cruciales para el desarrollo de materiales magnéticos moleculares.
- Comprender los factores que rigen la anisotropía magnética es clave para diseñar SIM eficientes.
- Investigar el comportamiento de las SIM en solución es importante para posibles aplicaciones.
Objetivo del estudio:
- Para sintetizar y caracterizar el complejo [Dy(tta) 3(L) ].
- Investigar las propiedades magnéticas y la anisotropía del complejo [Dy(tta) 3(L) ] tanto en la fase cristalina como en la de solución.
- Para evaluar la robustez y la persistencia del efecto memoria del complejo.
Principales métodos:
- Síntesis y difracción de rayos X monocristalino del complejo [Dy(tta) 3(L) ].
- Mediciones de susceptibilidad magnética de corriente continua (dc) y corriente alterna (ac) de temperatura variable.
- Magnetometría de muestras vibratorias (VSM) y mediciones de dicroísmo magnético circular (MCD).
- Cálculos de la Teoría Funcional de Densidad (DFT) para el análisis teórico de la anisotropía magnética.
Principales resultados:
- El complejo [Dy(tta) 3(L) ] exhibe un comportamiento de imán de iones individuales tanto en estado cristalino como en estado de solución.
- Los ejes experimentales y teóricos de la anisotropía magnética muestran un excelente acuerdo, alineándose con los átomos electro-negativos en la esfera de coordinación.
- Las mediciones de VSM y MCD confirman la robustez del complejo, demostrando un efecto de memoria persistente en solución hasta 4 K.
Conclusiones:
- El complejo [Dy(tta) 3(L) ] es un prometedor imán de iones únicos con propiedades robustas.
- La alineación de los ejes de anisotropía magnética proporciona información sobre los principios de diseño de las SIM.
- La persistencia del efecto memoria en la solución abre posibilidades para aplicaciones magnéticas basadas en soluciones.
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