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Proceso de autoensamblaje de un hexágono cíclico dodecanuclear Pt (II) vinculado

Ayako Baba¹, Tatsuo Kojima¹, Shuichi Hiraoka¹

¹Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902 Japan.

Journal of the American Chemical Society

|June 4, 2015

Resumen

Los investigadores investigaron el autoensamblaje de los macrociclos ligados al platino. Se identificó un complejo específico de 1:2 como un intermediario clave, que controla la velocidad de ensamblaje supramolecular.

Área de la Ciencia:

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

Sus antecedentes:

Investigar el autoensamblaje de los macrociclos ligados al platino es crucial para el desarrollo de nuevas estructuras supramoleculares.
Comprender las especies intermedias y la cinética de reacción es clave para controlar los procesos de autoensamblaje.

Objetivo del estudio:

Para investigar el proceso de autoensamblaje de un macrociclo hexagonal vinculado a Pt{\displaystyle Pt}
Para identificar y caracterizar los intermediarios clave en la vía de autoensamblaje.
Determinar el paso que determina la velocidad en la formación del macrociclo supramolecular.

Principales métodos:

El monitoreo del proceso de autoensamblaje mediante la resonancia magnética nuclear de protones ((1) H NMR).
Analizando los intermedios a través del análisis n-k.
Caracterizar el intermedio clave utilizando (1) RMN H, RMN de Espectroscopia Ordenada por Difusión (DOSY) y espectrometría de masas de tiempo de vuelo por ionización por electrospray (ESI-TOF).

Principales resultados:

Un complejo 1:2 de una unidad dinuclear Pt(II) y un ligando ditópico orgánico se observó exclusivamente como un intermediario estable.
La formación de este complejo 1:2 se identificó como el paso que determina la velocidad en el conjunto general del macrociclo.
La estructura del intermediario clave 1:2 fue confirmada inequívocamente a través de varias técnicas espectroscópicas y de espectrometría de masas.

Conclusiones:

El autoensamblaje de los macrociclos hexagonales vinculados a Pt (II) procede a través de un intermedio bien definido.
El complejo 1:2 juega un papel crítico en el control de la cinética de la formación del macrociclo supramolecular.
La caracterización detallada de los productos intermedios proporciona información sobre el mecanismo del complejo ensamblaje supramolecular.

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