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Complejos organometálicos para la óptica no lineal. 30.1 Propiedades ópticas electrocrómicas lineales y no lineales
Clem E Powell1, Marie P Cifuentes, Joseph P Morrall
1Department of Chemistry, Australian National University, Canberra ACT 0200, Australia.
Journal of the American Chemical Society
|January 9, 2003
Resumen
Este estudio demuestra la conmutación electrocrómica de la no linealidad óptica en complejos de rutenio. Los investigadores utilizaron la espectroelectroquímica y el TD-DFT para afinar los complejos alquiniles metálicos para obtener propiedades ópticas sintonizables.
Área de la Ciencia:
- Coordinación Química de la Coordinación
- Ciencia de los materiales Ciencia de los materiales.
- La espectroscopia es una técnica de espectroscopia.
Sus antecedentes:
- Los complejos metálicos de alquinilo ofrecen propiedades electrónicas y ópticas sintonizables.
- La comprensión de las transiciones electrónicas en estados oxidados es crucial para las aplicaciones de materiales.
- Las células electroquímicas de capa delgada ópticamente transparentes permiten estudios in situ.
Objetivo del estudio:
- Para identificar y asignar transiciones electrónicas en complejos oxidados de rutenio-alquinilo.
- Para demostrar la conmutación electrocrómica de la no linealidad óptica.
- Para correlacionar las propiedades espectrales con el comportamiento óptico no lineal.
Principales métodos:
- Voltametría cíclica y electroquímica del espectro UV-NIR.
- Cálculos de la teoría funcional de la densidad dependiente del tiempo (TD-DFT).
- Medidas de Z-scan utilizando una célula electroquímica de capa delgada (OTTLE) ópticamente transparente.
Principales resultados:
- Se observó una oxidación casi reversible de Ru (II/III) para los complejos de rutenio (II).
- Los complejos de rutenio oxidado (III) exhibieron nuevas bandas de absorción de baja energía en la región cercana al IR.
- Los cálculos TD-DFT racionalizaron las características espectrales observadas.
- Se logró una fácil conmutación electrocrómica de propiedades ópticas no lineales cúbicas.
Conclusiones:
- El estudio asignó con éxito transiciones intensas en complejos alquinílicos de metales oxidados.
- Se demostró la conmutación electrocrómica de la refracción y absorción molecular no lineal.
- Este trabajo representa el primer control electroquímico de la no linealidad óptica en tales sistemas.
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