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Chiral-at-Metal Phosphorescent Square-Planar Pt(II) - Complejos de un ligando organometálico aciral

Thorben R Schulte¹, Julian J Holstein¹, Lennard Krause²

¹Department of Chemistry and Chemical Biology, TU Dortmund University , Otto-Hahn-Straße 6, 44227 Dortmund, Germany.

Journal of the American Chemical Society

|May 9, 2017

Resumen

Los investigadores sintetizaron complejos quirales de platino utilizando un ligando C ^ N-donante. Estos complejos exhiben fosforescencia y fuerte dicroísmo circular (CD) y efectos de luminiscencia polarizada circularmente (CPL), mostrando potencial para materiales quirópticos y luminiscentes.

Área de la Ciencia:

Química organometálica
Ciencias de los materiales

Sus antecedentes:

Los complejos cuadrado-planos de platino son importantes en la catálisis y la ciencia de los materiales.
La quiralidad en los complejos metálicos puede conducir a propiedades fotofísicas únicas.

Objetivo del estudio:

Síntesis y caracterización de nuevos complejos de platino cuadrado-planar cis- y transciclometalizados.
Para investigar las propiedades quirópticas y luminiscentes de estos complejos.

Principales métodos:

Síntesis de compuestos organometálicos con ligandos del donante C^N.
Caracterización mediante espectroscopia de RMN, espectrometría de masas y difracción de rayos X.
Estudios fotofísicos que incluyen mediciones de fosforescencia, dicroísmo circular (CD) y luminiscencia polarizada circular (CPL).
Cálculos teóricos mediante el TD-DFT.

Principales resultados:

Se han sintetizado con éxito complejos de platino sin carga con ligandos C^N-donantes.
Se demostró que los complejos son quirales con el centro de platino como el estereocentro.
Separaron enantiómeros de trans-[PtL^CN_2] y determinaron su configuración absoluta.
Se ha observado fosforescencia en estado sólido y en solución con un rendimiento cuántico moderado.
Se han reportado fuertes efectos CD y CPL para los enantiómeros.

Conclusiones:

El nuevo motivo estructural de los complejos ciclometalizados de platino es quiral y exhibe interesantes propiedades fotofísicas.
Los fuertes efectos CD y CPL observados hacen que estos complejos sean prometedores para aplicaciones en materiales quirópticos y luminiscentes.

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