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Síntesis de rombos quirales autoensambladores y su caracterización en solución, en la fase gaseosa y en la interfaz

Kyung Seok Jeong¹, Sun Young Kim, Ueon-Sang Shin

¹Department of Chemistry and Division of Molecular Engineering and Chemistry, Korea University, Seoul, 136-701, Korea.

Journal of the American Chemical Society

|December 15, 2005

Resumen

Los rombos quirales metalo-supramoleculares se ensamblan a sí mismos en solución. Estas estructuras, caracterizadas por una espectroscopia y microscopía avanzadas, exhiben una fragmentación única de la fase gaseosa y una deposición superficial ordenada influenciada por la quiralidad.

Área de la Ciencia:

Química supramolecular de las moléculas.
Coordinación Química de la Coordinación
Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

Los conjuntos quirales, enantiopuros y metalo-supramoleculares ofrecen propiedades únicas para aplicaciones avanzadas.
El autoensamblaje de jaulas de coordinación discretas es un área clave en la química supramolecular.

Objetivo del estudio:

Para investigar el autoensamblaje y la caracterización de los rombo quirales metalo-supramoleculares.
Para explorar el comportamiento de estos complejos en solución, fase gaseosa y en superficies.

Principales métodos:

Espectroscopia de RMN en solución y de dicroísmo circular (CD).
Electrospray Ionización Transformación de Fourier Ion Ciclotrón de resonancia (ESI-FT-ICR) espectrometría de masas de ionización por electrospray Espectrometría de masas de ionización por electrospray Ionización por electrospray Ionización por electrospray Ionización por electrospray Ionización por electrospray Ionización por electrospray
Microscopía de túnel de barrido electroquímica (EC-STM)
Cálculos de la Teoría Funcional de la Densidad (DFT, por sus siglas en inglés)

Principales resultados:

Formación de un complejo 2:2 como la especie principal en solución, con un pequeño complejo 3:3 observado.
La fragmentación en fase gaseosa de los complejos 2:2 revela la activación de enlaces mediados por metales dentro de los ligandos.
EC-STM demuestra imágenes de resolución submolecular y deposición potencialmente controlada de rombo en una superficie de 100 Cu.
La quiralidad dicta la formación de una única orientación de dominio sobre la deposición de la superficie.

Conclusiones:

Los rombos quirales metalo-supramoleculares pueden ensamblarse y caracterizarse de manera controlable utilizando una combinación de técnicas espectroscópicas y microscópicas.
El estudio proporciona información sobre el comportamiento de la solución, la fase gaseosa y la superficie de estos conjuntos quirales.
La quiralidad juega un papel crucial en la dirección del autoensamblaje y la organización superficial de estas estructuras supramoleculares.

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