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Modificación inducida por el invitado de una red de coordinación magnéticamente activa de cobre ultramicroporous,
Jorge A R Navarro1, Elisa Barea, Antonio Rodríguez-Diéguez
1Departamento de Química InorgAnica, Universidad de Granada, Av. Fuentenueva S/N, 18071 Granada, Spain. jarn@ugr.es
Journal of the American Chemical Society
|March 7, 2008
Resumen
Un nuevo polímero de coordinación exhibe propiedades de adsorción selectiva de gases, actuando como un tamiz molecular para el hidrógeno y el nitrógeno. Este material también captura dióxido de carbono a altas temperaturas, lo que influye en su comportamiento magnético.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química Química es la química.
- Química del estado sólido Química del estado sólido
Sus antecedentes:
- Los polímeros de coordinación ofrecen estructuras sintonizables para la adsorción de gases.
- Los materiales ultramicroporosos son clave para la separación y almacenamiento selectivo de gases.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo polímero de coordinación ultramicroporous.
- Para investigar sus propiedades de adsorción selectiva de gases (H2, N2, CO2).
- Para explorar el impacto de la adsorción de gas en las propiedades magnéticas del material.
Principales métodos:
- Síntesis y caracterización estructural del polímero de coordinación [Cu(F-pymo) 2 ((H2O) 1.25]n.t.
- Difracción de polvo de rayos X de temperatura variable (TXRPD) para el análisis estructural.
- Mediciones de adsorción/desorción de gases a varias temperaturas y presiones.
- Mediciones de propiedades magnéticas.
Principales resultados:
- El material, [Cu(F-pymo) 2 ((H2O) 1.25]n (1), exhibe una topología SIG con canales helicoidales.
- La forma activada (1') adsorbe selectivamente H2 sobre N2 a 77 K a través de la exclusión de tamaño.
- El CO2 se incorpora a altas temperaturas (hasta 433 K) a través de la expansión del canal.
- La absorción de gas conduce a altas densidades de moléculas invitadas, comparables a los estados líquido / sólido.
- La incorporación de CO2 aumenta la temperatura de transición magnética de 22 K a 29 K. La temperatura de transición magnética es de 22 K a 29 K. La incorporación de CO2 también aumenta la temperatura de transición magnética de 22 K a 29 K.
Conclusiones:
- El polímero de coordinación sintetizado demuestra capacidades de adsorción selectiva de gases.
- La estructura porosa del material y la deshidratación reversible son adecuadas para aplicaciones de separación de gases.
- La incorporación de gas influye significativamente en la temperatura de ordenamiento magnético, lo que indica las interacciones huésped-anfitrión.
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