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Sistemas de autoensamblaje impulsados por protones basados en dendrímeros con núcleo de ciclama y [Ru (bpy) (CN)
Giacomo Bergamini1, Christophe Saudan, Paola Ceroni
1Dipartimento di Chimica G. Ciamician, Università di Bologna, via Selmi 2, I-40126 Bologna, Italy.
Journal of the American Chemical Society
|December 17, 2004
Resumen
Los huéspedes de ciclam protonados, como los ligandos 1 y 2, forman aductos con complejos de rutenio. Estos adductos exhiben comportamiento de puerta lógica, conmutando salidas ópticas con estímulos ácidos y basales.
Área de la Ciencia:
- Coordinación Química de la Coordinación
- Química supramolecular de las moléculas.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- El 1,4,8,11-tetraazaciclotetradecano (ciclam) y sus derivados son ligandos clave en la química de la coordinación.
- Los derivados del ciclo protonado pueden actuar como huéspedes para complejos metálicos.
- Los complejos de polipiridil de rutenio son conocidos por sus propiedades fotofísicas.
Objetivo del estudio:
- Para investigar la formación y las propiedades de los adductos impulsados por ácido entre [Ru(bpy) ((CN) 4 ((2-)) y los ligandos funcionalizados del ciclam.
- Para explorar las interacciones huésped-huésped y los mecanismos de transferencia de energía dentro de estos adductos.
- Para demostrar el potencial de estos adductos en operaciones de lógica molecular.
Principales métodos:
- Síntesis y caracterización de ligandos de ciclam funcionalizados y complejos de rutenio.
- Estudios espectroscópicos (absorción y emisión) para monitorear la formación de adductos y la transferencia de energía.
- Experimentos de titulación con ácidos y bases para inducir y interrumpir aductos.
- Análisis de salidas ópticas para determinar el comportamiento de la puerta lógica (XOR y XNOR).
Principales resultados:
- Formación de aductos estables [[Ru(bpy) ((CN) 4) -2). (2H+).1] y el Ru (bpy) (CN) (4) (2-). (2H+).2] en una solución.
- Eficiencia en el apagado por fluorescencia de las unidades de naftilo a través de la transferencia de energía al complejo de rutenio.
- Los aductos pueden ser alterados de forma reversible mediante la adición de una base o un ácido adicional.
- Demostración del comportamiento de la puerta lógica XOR y XNOR basado en salidas ópticas distintas (emisión de naftaleno y Ru(bpy).
Conclusiones:
- Los ligandos de ciclam funcionalizados pueden alojar efectivamente complejos protonados de cianuro de rutenio.
- Los adductos supramoleculares resultantes exhiben propiedades fotofísicas sintonizables.
- Estos sistemas sirven como plataformas para el desarrollo de puertas de lógica molecular que responden a estímulos químicos.
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