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Metalomesógenos emisores basados en complejos de 2-fenilpiridina de iridio (III)
Amedeo Santoro1, Anton M Prokhorov, Valery N Kozhevnikov
1Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
Journal of the American Chemical Society
|March 19, 2011
Resumen
Los investigadores sintetizaron nuevos complejos de iridio (III) que exhiben cristalinidad líquida. Estos complejos emisores y mesomórficos allanan el camino para nuevos materiales en optoelectrónica y aplicaciones avanzadas de materiales.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Ciencia de los materiales Ciencia de los materiales.
- La cristalografía es una técnica de cristalografía.
Sus antecedentes:
- Los complejos de iridio (III) son conocidos por sus propiedades fotoluminiscentes.
- La cristalinidad líquida en complejos de coordinación es un área de investigación en desarrollo.
- Los ligandos anisotrópicos pueden influir en el autoensamblaje y las propiedades de los complejos metálicos.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos complejos de iridio (III) con ligandos anisotrópicos de piridina funcionalizados con alkoxi.
- Investigar las propiedades líquidas cristalinas y emisoras de estos nuevos complejos.
- Explorar el potencial de estos complejos en las aplicaciones de la ciencia de los materiales.
Principales métodos:
- Síntesis de complejos de iridio (III) utilizando 2,5-di (IV) -alcoxifenil (piridina) y ligandos poli (alcoxi) relacionados.
- Caracterización de los complejos utilizando técnicas como la espectroscopia de RMN, la espectrometría de masas y la cristalografía de rayos X.
- Evaluación de las propiedades fotoluminiscentes y el comportamiento térmico, incluida la calorimetría de barrido diferencial y la microscopía óptica polarizada para la cristalinidad líquida.
Principales resultados:
- Preparación de complejos emisores de iridio (III) que contienen cloruro y dimetilsulfóxido.
- Síntesis de complejos analógicos bis(2-fenilpiridina) iridio(III) acac utilizando ligandos poli(alcoxi).
- Observación de una cristalinidad líquida sin precedentes (mesomorfismo) en estos complejos de iridio octaédrico.
Conclusiones:
- La incorporación de ligandos de piridina anisotrópicos alkoxi-funcionalizados permite la formación de complejos de iridio ((III) emisores, líquido-cristalino.
- Estos hallazgos representan el primer informe de cristalinidad líquida en complejos octaédricos de iridio (III) de esta clase estructural.
- Los complejos desarrollados son prometedores para aplicaciones en áreas como diodos orgánicos emisores de luz (OLED) y materiales funcionales avanzados.
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