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Propiedades magnéticas de una sola molécula fotoinducidas en un hierro de cuatro coordenadas (II) complejo de cruce
Corine Mathonière1, Hsiu-Jung Lin, Diana Siretanu
1CNRS, ICMCB, UPR 9048, F-33600 Pessac, France.
Journal of the American Chemical Society
|December 10, 2013
Resumen
Este estudio revela un complejo de hierro que exhibe propiedades de cruce de espín (SCO). Tras la irradiación de luz, muestra una conmutación de espín fotoinducida y el comportamiento del imán de una sola molécula a bajas temperaturas.
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:
- El complejo de hierro ((II) PhB ((MesIm) 3Fe-NPPh3 (1) exhibe un cruce de espín térmico (SCO) entre estados de alto y bajo espín.
- Los materiales SCO son de interés por sus aplicaciones potenciales en interruptores moleculares y dispositivos de memoria.
Objetivo del estudio:
- Para investigar la fotoactividad y las propiedades magnéticas del complejo Fe (II) SCO.
- Explorar el potencial de este complejo como un imán de una sola molécula (SMM) fotoinducido.
Principales métodos:
- Mediciones de reflectividad óptica para determinar cambios en el estado de giro.
- Mediciones fotomagnéticas para evaluar las propiedades magnéticas.
- Estudios de relajación por magnetización a temperatura variable. estudios de relajación por magnetización a temperatura variable.
Principales resultados:
- El complejo es fotoactivo por debajo de 20 K, mostrando una transición fotoinducida del estado de baja espina al estado de alta espina.
- Bajo irradiación continua de luz blanca por debajo de 5 K, el complejo exhibe una lenta relajación de la magnetización, característica del comportamiento del imán de una sola molécula (SMM).
- Los fenómenos observados están relacionados con el fenómeno de cruce de espín.
Conclusiones:
- El complejo Fe ((II) PhB ((MesIm) 3Fe-NPPh3 (1) demuestra propiedades de conmutación de espín y SMM fotoinducidas.
- Este complejo sirve como modelo estructural para el diseño de nuevos SMM mononucleares fotoinducidos utilizando SCO.
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