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Rhodamine 6G-Labelled Pyridyl Aroylhydrazone Fe ((II) Complejo que exhibe cruce de espín sinérgico y fluorescencia

Juan Yuan^1,2, Shu-Qi Wu³, Mei-Jiao Liu¹

¹Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China.

Journal of the American Chemical Society

|July 10, 2018

Resumen

Los investigadores desarrollaron un nuevo complejo de hierro para los materiales de cruce fluorescente-espín (SCO). Este complejo exhibe una transición SCO de tres pasos y atrapamiento de estado de giro inducido por la luz, con fluorescencia vinculada al comportamiento SCO.

Área de la Ciencia:

Química de coordinación
Ciencias de los materiales
Química supramolecular

Sus antecedentes:

Los materiales de cruce de espín (SCO) son de interés para los interruptores y sensores moleculares.
El desarrollo de nuevos materiales SCO con propiedades sintonizables es un desafío de investigación en curso.
Los materiales fluorescentes SCO ofrecen potencial para aplicaciones de detección óptica.

Objetivo del estudio:

Sintetizar y caracterizar un nuevo complejo de Fe (II) para aplicaciones de cruce fluorescente-espín.
Investigar el comportamiento de cruce de espín y las propiedades estructurales del complejo sintetizado.
Para explorar la relación entre la fluorescencia y los fenómenos de cruce de espín.

Principales métodos:

Síntesis de un ligando de hidrazona 6G de piridinacarbaldehído y su complejo Fe (II) (1).
Difracción de rayos X de un solo cristal para la determinación estructural.
Mediciones de la susceptibilidad magnética para estudiar las transiciones de cruce de espín.
Estudios fotofísicos para investigar las propiedades de fluorescencia.

Principales resultados:

El complejo Fe (II) 1 presenta un entorno de coordinación FeN4O2 con apilamiento intermolecular π-π formando cadenas 1D.
El complejo 1 exhibe una transición de SCO en tres pasos entre 120 y 350 K.
La forma desolvada (1-d) muestra SCO cerca de la temperatura ambiente con un bucle de histeresis de 40 K y atrapamiento de estado de giro excitado inducido por la luz.
El complejo 1-d muestra variaciones discontinuas de fluorescencia relacionadas con SCO.

Conclusiones:

Se ha sintetizado con éxito un nuevo complejo de Fe (II) basado en un ligando de hidrazona de rodamina 6G.
El complejo demuestra un comportamiento de cruce de espín complejo, que incluye un amplio bucle de histeresis y efectos inducidos por la luz.
Se observaron propiedades sinérgicas de cruce de espín y fluorescencia, destacando su potencial para materiales funcionales avanzados.

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