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La organización en columnas de los anillos Pt4 autoensamblados de la cabeza a la cola
Peter D Frischmann1, Samuel Guieu, Raymond Tabeshi
1Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.
Journal of the American Chemical Society
|May 18, 2010
Resumen
Los investigadores crearon anillos de platino en forma de disco mediante el autoensamblaje. Estos macrociclos pueden formar estructuras columnares, lo que ofrece el potencial para crear nanotubos que contienen iones de platino.
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 ligandos de base de Schiff son versátiles bloques de construcción en la química de la coordinación.
- El autoensamblaje es una poderosa estrategia para construir arquitecturas moleculares complejas.
- Los complejos de platino son de interés por sus propiedades catalíticas y electrónicas.
Objetivo del estudio:
- Para investigar el autoensamblaje de iones de platino ((2+) con proligandos de base de Schiff sintonizables.
- Para explorar el comportamiento de agregación de los macrociclos resultantes Pt(4).
- Evaluar el potencial de estas estructuras autoensambladas para la formación de nanotubos.
Principales métodos:
- Autoensamblaje de 12 componentes de Pt ((2+) con proligandos de base de Schiff.
- Dispersión de luz dinámica y estática. dispersión de luz dinámica y estática.
- Espectroscopia por RMN. espectroscopia por RMN. espectroscopia por RMN. espectroscopia por RMN. espectroscopia por RMN.
- Difracción de rayos X en polvo.
- Microscopía de electrones de transmisión.
- Análisis termodinámico de la dimerización.
Principales resultados:
- Se sintetizaron con éxito macrociclos en forma de disco, S(4) simétricos Pt(4).
- Se formaron arquitecturas columnares, excepto cuando estaban presentes sustitutos voluminosos, lo que condujo a la formación de dímeros.
- Se descubrió que la dimerización es un proceso impulsado por la entropía.
- Pt(4) anillos con sustituyentes específicos formaron mesofasas liotrópicas en disolventes no polares.
Conclusiones:
- Los proligandos de base sintonizables de Schiff permiten el autoensamblaje controlado de los macrociclos Pt.
- El comportamiento de la agregación es altamente dependiente de la naturaleza de los sustituyentes.
- Estos macrociclos autoensamblados Pt(4) son precursores prometedores para los nuevos nanotubos que contienen iones de platino.
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