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Formación inesperada de un derivado bisfulleroide Sc3C2@C80

Hiroki Kurihara¹, Yuto Iiduka, Yves Rubin

¹Life Science Center of Tsukuba Advanced Research Alliance, University of Tsukuba , Tsukuba, Ibaraki 305-8577, Japan.

Journal of the American Chemical Society

|February 16, 2012

Resumen

Los investigadores reaccionaron la tetrazina con un derivado del fullereno, obteniendo un producto de jaula abierta en lugar del esperado anillo de cuatro miembros. Este estudio proporciona información sobre el comportamiento de los fullerenos que contienen metales en las reacciones químicas.

Área de la Ciencia:

La química del fullereno es muy diferente.
Química organometálica de las sustancias orgánicas.
Química supramolecular de las moléculas.

Sus antecedentes:

Los fullerenos son moléculas basadas en carbono con propiedades electrónicas y estructurales únicas.
Los fullerenos que contienen metales, como Sc(3)C(2)@C(80), ofrecen potencial para nuevas aplicaciones.
Las reacciones con fullerenos pueden dar lugar a diversos derivados, incluidas las estructuras de jaula abierta.

Objetivo del estudio:

Para investigar la reacción de la tetrazina con el fullereno que contiene metales Sc(3)C(2)@C(80).
Para determinar la estructura del producto resultante y compararlo con las reacciones con fullerenos prístinos.
Para explorar los pasos iniciales de la liberación de átomos metálicos de los fullerenos endoderales.

Principales métodos:

Espectroscopia de Resonancia Magnética Nuclear (RMN) para el esclarecimiento estructural.
Cálculos de la Teoría Funcional de Densidad (DFT) para la validación teórica.
Espectroscopia de resonancia paramagnética de electrones (EPR) para sondear la ubicación del átomo de metal.

Principales resultados:

La reacción produjo exclusivamente un derivado de jaula abierta (2), no el esperado producto con inserción de C2 (3).
La estructura del derivado de la jaula abierta fue confirmada por RMN y cálculos teóricos.
La espectroscopia EPR reveló un solo átomo de escandio colocado dentro de la protuberancia de la jaula, lo que indica un paso hacia la liberación de átomos metálicos.

Conclusiones:

La vía de reacción difiere significativamente de la observada con el C60 prístino.
La formación de la estructura de jaula abierta es un hallazgo clave en la química de los fullerenos.
Este trabajo representa un paso significativo hacia la comprensión y el control de la liberación de átomos metálicos encapsulados de los fullerenos endoderales.

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