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Las cápsulas de coordinación basadas en iridio de fenilatopiridina, luminiscentes, enantiopuras y basadas en iridio
Oleg Chepelin1, Jakub Ujma, Xiaohua Wu
1EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh EH9 3JJ, UK.
Journal of the American Chemical Society
|November 10, 2012
Resumen
Los investigadores crearon la primera cápsula molecular utilizando un complejo de iridio. Estas nuevas cápsulas pueden atrapar e intercambiar huéspedes aniónicos, mostrando propiedades luminiscentes únicas que no se ven en sistemas más simples.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Química organometálica Química orgánica de los metales.
- La fotoquímica es la fotoquímica.
Sus antecedentes:
- Desarrollo de jaulas moleculares para la encapsulación de huéspedes.
- Síntesis y propiedades de los complejos de iridio (III).
- Técnicas de resolución quiral para compuestos organometálicos.
Objetivo del estudio:
- Para sintetizar la primera cápsula molecular basada en un complejo de iridio (III).
- Para investigar la encapsulación del invitado y las capacidades de intercambio de la cápsula.
- Explorar las propiedades fotofísicas del nuevo sistema supramolecular.
Principales métodos:
- Síntesis de un complejo de iridio (III) con ligandos de 2-fenilpiridina.
- Resolución quiral de un complejo de iridio dinuclear.
- Formación de octaedros homoquirales Ir(6) L(4) utilizando el 1,3,5-tricianobenzeno.
- Estudios de soluciones y difracción de rayos X para el análisis estructural.
- Mediciones fotofísicas para evaluar la luminiscencia.
Principales resultados:
- Preparación exitosa de la primera cápsula molecular a base de iridio (III).
- Demostración de la encapsulación de cuatro contraaniones dentro de la cápsula.
- Evidencia de capacidades de intercambio aniónico con diferentes huéspedes aniónicos.
- Observación de la luminiscencia en el sistema de cápsulas, distinto de los análogos mononucleares.
Conclusiones:
- El estudio presenta una nueva cápsula molecular de iridio (III) con propiedades de unión e intercambio de aniones.
- La naturaleza quiral de la cápsula influye en su estructura y aplicaciones potenciales.
- La luminiscencia observada sugiere nuevas vías para los materiales supramoleculares fotofuncionales.
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