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Manipulación química de las dinámicas de cruce de espín a través de una dilución juiciosa de iones metálicos
Xiang Li1, Dong Zhang1, Yuqing Qian1
1School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
Journal of the American Chemical Society
|April 19, 2023
Resumen
La dilución controlada de iones metálicos manipula químicamente el cruce de espín (SCO) en complejos de hierro. La dilución con iones específicos como Zn ((II) suprime el SCO térmico mientras conserva las capacidades de conmutación fotográfica.
Área de la Ciencia:
- Química de coordinación
- Ciencias de los materiales
- Fenómenos de cruce de espín
Sus antecedentes:
- El complejo de Fe (II) [Fe (MeL) (NCBH3) ] previamente informado presenta transiciones lentas al estado de giro.
- El estado de baja rotación es difícil de acceder debido a la lenta dinámica de alta rotación a baja rotación.
- Los materiales de espín cruzado (SCO) son sensibles a su entorno químico.
Objetivo del estudio:
- Para manipular químicamente el proceso de cruce de espín (SCO) en un complejo de Fe (II).
- Para investigar el efecto de la dilución de iones metálicos en el comportamiento de la SCO.
- Explorar el potencial de control de las propiedades de SCO y de conmutación fotográfica.
Principales métodos:
- Síntesis de complejos de metales mezclados Fe (II) mediante dilución controlada de iones metálicos (Ni (II) o Zn (II)).
- Caracterización del comportamiento del estado de giro (SCO inducido térmicamente).
- Evaluación de las propiedades de conmutación fotográfica de los materiales sintetizados.
Principales resultados:
- La dilución de iones metálicos alteró con éxito el comportamiento SCO inducido térmicamente.
- Las diluciones de Ni (II) y Zn (II) influyeron en la aparición o supresión de SCO.
- Se observó fotocambio reversible en todos los complejos de metales mezclados.
- La dilución de Zn{II} estabilizó los estados de Fe{II} de alto espín, suprimiendo el SCO térmico pero conservando la fotointercambiabilidad.
Conclusiones:
- La dilución controlada de iones metálicos es una estrategia eficaz para ajustar las propiedades de SCO en los complejos de Fe (II).
- Los iones diluyentes específicos (por ejemplo, Zn(II)) pueden suprimir selectivamente el SCO térmico mientras se preserva la fotoconmutación.
- Esto proporciona una vía para diseñar materiales con dinámica de estado de giro y comportamiento fotorresponsivo a medida.
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