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Nanohojas de coordinación basadas en complejos de terpiridina-zinco: como materiales anfitriones fotoactivos
Takamasa Tsukamoto1,2, Kenji Takada1, Ryota Sakamoto1,3
1Department of Chemistry, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Journal of the American Chemical Society
|March 22, 2017
Resumen
Las nuevas nanohojas de coordinación fotoluminiscente (CONASH) que utilizan ligandos de terpiridina e iones de zinc presentan diversas estructuras y fotofunciones sintonizables. Estos materiales muestran potencial para aplicaciones avanzadas debido a sus propiedades ópticas únicas y capacidades de intercambio de aniones.
Área de la Ciencia:
- Ciencias de los materiales
- Química supramolecular
- La fotoquímica
Sus antecedentes:
- Las nanohojas de coordinación fotoluminiscentes (CONASH) ofrecen propiedades sintonizables a través del diseño y la coordinación de los ligandos.
- Los ligandos de terpiridina (tpy) y los iones de zinc (II) son componentes clave para construir nanomateriales funcionales.
Objetivo del estudio:
- Para sintetizar y caracterizar diversos tpy-zinc (II) CONASH con diferentes estructuras y funciones fotográficas.
- Investigar el impacto de la estructura del ligando y de los contraaniones en las propiedades fotofísicas de las CONASH.
- Explorar el potencial de las CONASH en aplicaciones como el intercambio aniónico y la migración de excitones.
Principales métodos:
- Síntesis de CONASH a través de la reacción de interfaz líquido/líquido entre los ligandos de terpiridina y las sales de zinc.
- Caracterización estructural mediante técnicas sensibles a los modos de coordinación y las interacciones aniónicas.
- Mediciones fotofísicas, incluidos los estudios de espectroscopia de luminiscencia y solvatocromismo.
Principales resultados:
- Se sintetizaron dos CONASHs tpy-zinc ((II): un 1-Zn catiónico con un motivo bis ((tpy) Zn y un 1-Zn2 ((SO4) 2 neutro con un motivo [Zn2 ((μ-O2SO2) 2 ((tpy) 2), que difieren en la coordinación aniónica.
- El color de la luminiscencia varió desde el azul (480 nm) para 1-Zn hasta el amarillo (552 nm) para 1-Zn2 ((SO4) 2), con este último exhibiendo solvatoluminocromismo.
- La modificación del ligando tpy (ligando 2) dio lugar a una emisión naranja con desplazamiento al rojo (590 nm) para el 2-Zn.
- Los CONASH catiónicos (1-Zn y 2-Zn) demostraron capacidad de intercambio aniónico, incorporando con éxito tintes aniónicos de xanteno y facilitando la migración de excitones.
Conclusiones:
- La estructura y las fotofunciones de tpy-zinc ((II) CONASH son altamente sintonizables al alterar el diseño del ligando y la naturaleza de los aniones coordinadores.
- Estos CONASH exhiben propiedades fotofísicas prometedoras, incluida la luminiscencia variable y el solvatocromismo.
- Las capacidades demostradas de intercambio aniónico y migración de excitones resaltan el potencial de tpy-zinc (II) CONASH como nanomateriales fotofuncionales versátiles.
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