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Bistable multifuncionalidad y conmutable fuerte ferromagnético-antiferromagnético acoplamiento en una unidimensional
Minoru Mitsumi1, Takashi Nishitani, Shota Yamasaki
1Department of Material Science and ‡Research Center for New Functional Materials, Graduate School of Material Science, University of Hyogo , 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
Journal of the American Chemical Society
|April 23, 2014
Resumen
Este estudio revela un nuevo complejo de rodio-semiquinonato exhibiendo biestable propiedades magnéticas y conductoras. Su transición de fase única permite una multifuncionalidad controlada a través de estímulos externos como la presión.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
- Física del estado sólido Física del estado sólido
Sus antecedentes:
- Los complejos de coordinación unidimensionales (1D) ofrecen propiedades electrónicas y magnéticas únicas.
- Los ligandos semiquinonados pueden mediar interacciones magnéticas e influir en el empaque de cristales.
- El ajuste de las propiedades de los materiales a través de estímulos externos como la temperatura y la presión es un objetivo clave en la ciencia de los materiales.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo complejo 1D de rodio (I) -semiquinonato.
- Investigar las propiedades magnéticas y eléctricas del complejo, centrándose en la multifuncionalidad potencial.
- Comprender el mecanismo detrás de la bistabilidad observada y su dependencia de las condiciones externas.
Principales métodos:
- Síntesis del complejo rodio (I) -semiquinonato (Rh3,6-DBSQ-4,5-MeO) 2) (CO) 2) ∞.
- Análisis estructural mediante difracción de rayos X.
- Caracterización de las propiedades magnéticas (susceptibilidad, ordenamiento).
- Medición de la conductividad eléctrica y la resistividad.
- Cálculos de la Teoría Funcional de la Densidad (DFT).
Principales resultados:
- El complejo exhibe propiedades magnéticas y conductivas bistables sin precedentes dentro de un rango de temperatura específico (228-207 K) debido a una transición de fase de primer orden con histeresis térmica.
- Fuertes interacciones ferromagnéticas en la fase de transición de baja temperatura a las interacciones antiferromagnéticas en la fase de temperatura ambiente.
- Ordenamiento antiferromagnético de largo alcance y magnetización espontánea a 14,2 K.
- Conductividad eléctrica relativamente alta (4.8 × 10−4 S cm−1) a 300 K, con resistividad que también muestra histeresis.
- La fase ferromagnética de baja temperatura puede estabilizarse a temperatura ambiente utilizando una presión moderada (1.4 kbar).
Conclusiones:
- El complejo rodio-semiquinonato muestra una notable multifuncionalidad bistable, impulsada por una transición de fase estructural que implica cambios en los enlaces de hidrógeno.
- La interacción entre el apilamiento molecular, las interacciones magnéticas (ferromagnéticas a antiferromagnéticas) y la conductividad eléctrica es significativa.
- Los estímulos externos, particularmente la presión, pueden controlar y estabilizar efectivamente los estados multifuncionales del material, abriendo caminos para los dispositivos electrónicos conmutables.
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