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Cristal poroso derivado de un vinculante tricarboxilato con dos motivos de unión distintos
Antek G Wong-Foy1, Olivier Lebel, Adam J Matzger
1Department of Chemistry, Macromolecular Science and Engineering Program, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, USA.
Journal of the American Chemical Society
|December 7, 2007
Resumen
Los investigadores crearon un polímero de coordinación altamente poroso utilizando un nuevo enlace orgánico. Este material exhibe una superficie excepcional y una capacidad significativa de absorción de hidrógeno a bajas temperaturas.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química supramolecular de las moléculas.
Sus antecedentes:
- Los polímeros de coordinación porosos (PCP) se sintetizan utilizando iones metálicos y enlaces orgánicos.
- El desarrollo de PCP con una gran superficie y propiedades específicas de absorción de gas es crucial para aplicaciones en el almacenamiento y separación de gas.
- Los enlaces orgánicos de simetría reducida ofrecen oportunidades para crear nuevas arquitecturas de PCP.
Objetivo del estudio:
- Para demostrar la síntesis de un polímero de coordinación altamente poroso utilizando un vinculante orgánico de simetría reducida.
- Para caracterizar las características estructurales y la porosidad del material resultante.
- Para evaluar la capacidad de almacenamiento de hidrógeno del polímero de coordinación sintetizado.
Principales métodos:
- Síntesis solvotermal que utiliza el ácido bifenilo-3,4',5-tricarboxílico y los iones Cu (II).
- Caracterización estructural del polímero de coordinación.
- Análisis de sorción de gas (absorción de H2) a temperaturas criogénicas (77 K).
Principales resultados:
- Se sintetizó con éxito un polímero de coordinación conectado a [3,4,6] con una porosidad muy alta (superficie BET = 3100 m2/g).
- La estructura incorpora de manera única tanto los motivos de rueda de remo dinuclear Cu (II) como los racimos trinucleares Cu (II).
- El material demostró un exceso significativo de absorción gravimétrica de H2 de 5.7 wt % a 45 bar, con una notable absorción a bajas presiones.
Conclusiones:
- Los enlaces orgánicos de simetría reducida son efectivos para el diseño de polímeros de coordinación porosa avanzados.
- El material sintetizado exhibe características prometedoras para aplicaciones de almacenamiento de hidrógeno.
- La coexistencia de diferentes tipos de racimos de cobre dentro del marco contribuye a sus propiedades únicas.
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