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Transferencia eficiente de energía anfitrión-invitado en complejos policatiónicos de ciclofano-perileno dimida en
Seán T J Ryan1, Jesús Del Barrio, Indrajit Ghosh
1Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom.
Journal of the American Chemical Society
|June 4, 2014
Resumen
Complejos supramoleculares altamente cargados se auto-ensamblan en el agua. Estos complejos forman un 3-polypseudorotaxane con propiedades fotofísicas mejoradas y actúan como sensores selectivos para la melatonina.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Ciencia de los materiales Ciencia de los materiales.
- Sensores químicos de detección de sustancias químicas.
Sus antecedentes:
- La química cíclica huésped-invitado es crucial para el desarrollo de materiales avanzados.
- Las diimidas de perileno (PDIs) son cromóforos versátiles con propiedades fotofísicas sintonizables.
- El autoensamblaje en medios acuosos ofrece rutas sintéticas respetuosas con el medio ambiente.
Objetivo del estudio:
- Para investigar el autoensamblaje de complejos supramoleculares altamente cargados.
- Para explorar la dinámica de transferencia de energía (ET) entre las moléculas anfitrionas y invitadas.
- Desarrollar nuevas arquitecturas supramoleculares con funcionalidades mejoradas y capacidades de detección.
Principales métodos:
- Síntesis y caracterización de ExBox y los derivados de PDI dicationic.
- Estudios de autoensamblaje en soluciones acuosas.
- Técnicas espectroscópicas (UV-Vis, fluorescencia) para monitorear la formación de complejos y ET.
- Estudios de complicación con el cucurbit[7]uril (CB[7]) para formar polipseudorotaxanos.
- Evaluación de las capacidades de quimiosensibilidad de la melatonina.
Principales resultados:
- Formación de complejos supramoleculares hexacationales estables entre ExBox y PDIs.
- Observación de la transferencia eficiente de energía entre ExBox y PDIs.
- El autoensamblaje exitoso de un 3-polypseudorotaxane usando ExBox, PDIs y CB[7].
- Mejora significativa de las propiedades fotofísicas del PDI dentro de la estructura del polipseudorotaxano.
- Demostración de la quimiosensibilidad selectiva para la melatonina utilizando los complejos binarios.
Conclusiones:
- Se pueden formar fácilmente ensamblajes supramoleculares altamente cargados en el agua.
- La arquitectura de 3-polypseudorotaxane conduce a propiedades fotofísicas superiores.
- Estos sistemas supramoleculares son prometedores para la detección selectiva de neurotransmisores.
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