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Marco tridimensional poroso de metal-metaloporfirina compuesto por jaulas poliédricas nanoscópicas
Xi-Sen Wang1, Le Meng, Qigan Cheng
1Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA.
Journal of the American Chemical Society
|September 30, 2011
Resumen
Un nuevo marco de metal-metaloporfirina, MMPF-1, presenta jaulas nanoscópicas con sitios de cobre abiertos. Esta estructura adsorbe selectivamente gases como H2 y O2 sobre N2 y CO2 sobre CH4.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- Coordinación Química de la Coordinación
Sus antecedentes:
- Los marcos metálico-orgánicos (MOF) ofrecen propiedades sintonizables para la adsorción de gases.
- Los MOF basados en porfirina son de interés debido a sus características electrónicas y estructurales únicas.
- El desarrollo de MOFs con sitios de metal abierto de alta densidad y tamaños de poro controlados es crucial para la separación selectiva de gases.
Objetivo del estudio:
- Para construir una novedosa jaula poliédrica nanoscópica que contenga un marco de metal-metaloporfirina (MMPF-1).
- Para investigar las propiedades de adsorción de gas del marco de trabajo recién sintetizado, centrándose en la selectividad.
- Para explorar el potencial de MMPF-1 en aplicaciones de separación de gases.
Principales métodos:
- Síntesis de MMPF-1 utilizando un ligando de porfirina diseñado a medida (5,15-bis(3,5-dicarboxifenil) porfina) y Cu(2)(carboxilato)(4) porciones.
- Caracterización de la estructura del marco, incluidas las jaulas nanoscópicas y las dimensiones de los poros.
- Se midieron isotermas de adsorción/desorción de gas para evaluar la selectividad de H2O/N2O, O2O/N2O y CO2O/CH4O.
Principales resultados:
- Construcción exitosa de MMPF-1, un marco de metal-metaloporfirina con jaulas poliédricas nanoscópicas.
- Se logró una alta densidad de 16 sitios de cobre abiertos dentro de cada jaula.
- El embalaje "ABAB" de las jaulas creó ultramicroporos, lo que lleva a la adsorción selectiva de H ^ 2) y O ^ 2) sobre N ^ 2) y CO ^ 2) sobre CH ^ 4).
Conclusiones:
- MMPF-1 representa una estructura de jaula poliédrica nanoscópica sin precedentes que contiene metal y metaloporfirina.
- La estructura única de los poros y la alta densidad de los sitios de cobre abiertos permiten la adsorción selectiva de gas.
- MMPF-1 se muestra prometedor para aplicaciones en la separación y almacenamiento selectivo de gases.
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