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Control sintético de la separación Pt...Pt y la fotofísica de los complejos binucleares de platino
Biwu Ma1, Jian Li, Peter I Djurovich
1Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA.
Journal of the American Chemical Society
|January 6, 2005
Resumen
Los complejos binucleares de platino sintetizados exhiben luminiscencia sintonizable, cambiando de azul a rojo a medida que disminuyen las distancias platino-platino. Este estudio revela una correlación entre el espaciado Pt-Pt y el estado emisor, impactando las propiedades fotofísicas.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- La fotofísica es la fotofísica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los complejos de platino ciclometalizados se investigan por sus propiedades luminiscentes.
- Los ligandos puentes juegan un papel crucial en la modulación del comportamiento electrónico y fotofísico de los complejos metálicos.
Objetivo del estudio:
- Para sintetizar y caracterizar una nueva serie de luminiscentes mu-pirazolato puenteado complejos binucleares de platino ciclometalados.
- Investigar el efecto de la variación de los ligandos de pirazolato y las distancias Pt-Pt en las propiedades fotofísicas, en particular la energía de emisión y los estados emisores.
Principales métodos:
- Síntesis y caracterización de complejos binucleares de platino utilizando varios ligandos de pirazolato.
- Cristalografía de rayos X para determinar las distancias de enlace Pt-Pt.
- Mediciones fotofísicas a 77 K para analizar espectros y energías de emisión.
Principales resultados:
- Síntesis exitosa de cuatro complejos binucleares de platino (1-4) y un complejo mononuclear (5).
- Las estructuras de rayos X revelaron distancias Pt-Pt decrecientes de 3.3763 ((7) Å a 2.8343 ((6) Å con diferentes ligandos de pirazolato.
- Los colores de emisión variaron de azul a verde a rojo, correlacionándose con la disminución de la distancia Pt-Pt.
- Los estados emisores pasaron de un triplete de centro de ligando mixto / transferencia de carga de metal a ligando a un estado de transferencia de carga de metal a metal a ligando.
Conclusiones:
- Las propiedades fotofísicas de estos complejos binucleares de platino están significativamente influenciadas por la distancia Pt-Pt.
- La luminiscencia sintonizable, de azul a rojo, se puede lograr modificando los ligandos de pirazolato puente.
- Los cambios observados en los estados emisores proporcionan información sobre las interacciones metal-metal en los sistemas binucleares de platino.
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