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Síntesis y propiedades estructurales, electroquímicas y de apilamiento de moléculas cónicas que poseen buckyferroceno
Yutaka Matsuo1, Ayako Muramatsu, Yuko Kamikawa
1Nakamura Functional Carbon Cluster Project, ERATO, Japan Science and Technology Agency, Department of Chemistry, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Journal of the American Chemical Society
|July 27, 2006
Resumen
Los investigadores sintetizaron nuevas moléculas híbridas de fullereno y ferroceno. Estos compuestos forman cristales columnares o cristales líquidos, con formas oxidadas que conservan las propiedades cristalinas líquidas.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los híbridos de fullereno y ferroceno ofrecen propiedades electrónicas y estructurales únicas.
- Las cadenas laterales de alquil influyen en el autoensamblaje molecular y el comportamiento de fase.
- Las estructuras supramoleculares son cruciales para las aplicaciones de materiales avanzados.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevas moléculas híbridas cónicas de fullereno-ferroceno.
- Para investigar el impacto de la longitud de la cadena lateral en el ensamblaje supramolecular (cristales frente a cristales líquidos).
- Para explorar las propiedades electroquímicas y el comportamiento cristalino líquido de las formas oxidadas.
Principales métodos:
- Síntesis de cinco moléculas híbridas de fullereno-ferroceno sustituidas por aralquilo (Fe[C60{C6H4-(OCO-C6H3-(OR)2-3,4)-4}5]Cp).
- Análisis estructural utilizando cristalografía de rayos X para muestras cristalinas.
- Calorimetría de barrido diferencial y microscopía óptica polarizada para la identificación de la fase de cristal líquido.
- Estudios electroquímicos (voltametría cíclica) para determinar las propiedades redox.
Principales resultados:
- Los compuestos con cadenas laterales de metilo formaron cristales columnares apilados de cabeza a cola.
- Los compuestos con cadenas laterales C18H38 más largas exhibieron un comportamiento cristalino líquido.
- La oxidación del compuesto cristalino líquido produjo una especie paramagnética de Fe (III) que también mostró propiedades cristalinas líquidas.
Conclusiones:
- La longitud de las cadenas laterales de aralquilo dicta el ensamblaje supramolecular de los híbridos fullereno-ferroceno, lo que lleva a cristales columnares o cristales líquidos.
- Las moléculas híbridas resultantes y sus formas oxidadas demuestran autoensamblaje sintonizable y potencial para materiales funcionales avanzados.
- Este trabajo amplía el alcance de la química fullereno-ferroceno en el diseño de nuevos sistemas supramoleculares.
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