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Marco orgánico de lantánidos porosos: síntesis, caracterización y propiedades de adsorción de gases sin precedentes
Long Pan1, Kristie M Adams, Hayden E Hernandez
1Department of Chemistry, University of Colorado at Denver, Campus Box 194, P.O. Box 173364, Denver, Colorado 80217-3364, USA.
Journal of the American Chemical Society
|March 6, 2003
Resumen
Se sintetizaron y caracterizaron nuevos polímeros de coordinación de lantánidos. Estos materiales exhiben porosidad y adsorción selectiva de dióxido de carbono, lo que sugiere aplicaciones potenciales en tecnologías de separación de gases.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Ciencia de los materiales Ciencia de los materiales.
- La cristalografía es una técnica de cristalografía.
Sus antecedentes:
- Los polímeros de coordinación de lantanuro son materiales avanzados con diversas aplicaciones.
- La síntesis hidrotermal ofrece una ruta versátil para crear estructuras inorgánicas complejas.
- El ácido 1,4-fenilenediacético (H2PDA) es un vinculante orgánico útil para la construcción de marcos de coordinación.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos polímeros de coordinación de lantánidos utilizando Ln(NO3) 3 y H2PDA.
- Investigar las propiedades estructurales y la porosidad de los materiales resultantes.
- Evaluar las capacidades de adsorción de gas, especialmente para el CO2, y explorar posibles aplicaciones.
Principales métodos:
- Síntesis hidrotermal de los polímeros de coordinación de los lantánidos.
- Difracción de rayos X monocristalino y en polvo para el análisis estructural.
- Análisis termogravimétrico (TGA) para la evaluación de la estabilidad térmica.
- Estudios de adsorción y desorción de gases (H2O, CO2, Ar, N2). estudios de adsorción y desorción de gases (H2O, CO2, Ar y N2). estudios de adsorción y desorción de gases (H2O, CO2, Ar y N2). estudios de adsorción y desorción de gases (H2O, CO2, Ar y N2). estudios de adsorción y desorción de gases (H2O, CO2, Ar y N2).
Principales resultados:
- Se han sintetizado con éxito los polímeros de coordinación lantánido isostructural [Ln{2) }{PDA}{3) }{H2O} x 2H2O (Ln = La, Er).
- La estructura cristalina presenta canales abiertos 1D capaces de acomodar moléculas invitadas.
- El marco evacuado [Er{2}{PDA}{3}] exhibe porosidad con un tamaño de ventana de poros de 3.4 Å y adsorbe selectivamente CO2 sobre Ar y N2.
- El material demuestra estabilidad hasta 450 °C.
Conclusiones:
- Los polímeros de coordinación de lantánidos sintetizados poseen porosidad ajustable.
- La adsorción selectiva de CO2 sugiere potencial para aplicaciones de separación de gases.
- La selectividad observada se atribuye a una combinación del tamaño de los poros y las interacciones huésped-huésped.
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