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Cromatografía de iones en fase gaseosa: selección del estado del metal de transición y formación de racimos de

M T Bowers, P R Kemper, G von Helden

Science (New York, N.Y.)

|June 4, 1993

Resumen

La cromatografía de iones en fase gaseosa separa los iones por estructura, revelando el crecimiento de grupos de carbono de cadenas a anillos y fullerenos. Esta técnica ofrece información sobre la química de los metales de transición y la evolución de los clústeres.

Área de la Ciencia:

Química analítica Química analítica es la que
Química Física es la química física.
Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

La cromatografía de iones en fase gaseosa (GPIC) es una poderosa técnica de separación.
GPIC puede distinguir iones con masa idéntica pero diferentes estructuras o estados electrónicos.

Objetivo del estudio:

Para describir las características de GPIC.
Aplicar el GPIC a la química de los metales de transición y a la química de los grupos de carbono.

Principales métodos:

Se empleó cromatografía de iones en fase gaseosa.
La técnica se aplicó para analizar complejos de metales de transición y grupos de carbono.

Principales resultados:

GPIC aclaró la reactividad selectiva de estado, desactivación y unión de ligandos en sistemas de metales de transición.
El estudio determinó la evolución estructural de los grupos de carbono (C4-C84).
Los grupos de carbono pasan de cadenas lineales a anillos monocíclicos, luego a estructuras policíclicas y finalmente a los fullerenos.

Conclusiones:

GPIC es eficaz para el análisis de sistemas químicos complejos.
Los fullerenos se forman a través de la isomerización de anillos de carbono planos a temperaturas elevadas, no por crecimiento directo del grafito.

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