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Topología inusual del marco metálico-orgánico y resistencia a la radiación a través de la química de coordinación del
Sara E Gilson1, Melissa Fairley2, Sylvia L Hanna3
1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.
Journal of the American Chemical Society
|October 15, 2021
Resumen
Los investigadores desarrollaron un nuevo marco de metal orgánico de neptunio (MOF) que demuestra una notable estabilidad a la radiación. Este MOF transuránico muestra una mayor resistencia a los rayos gamma que su enlace orgánico solo.
Área de la Ciencia:
- Ciencias de los materiales
- La radioquímica
- La cristalografía
Sus antecedentes:
- Las estructuras metal-orgánicas (MOF) ofrecen estructuras ajustables para diversas aplicaciones.
- Los elementos transuránicos, como el neptunio, presentan desafíos únicos en los estudios de síntesis y estabilidad de materiales.
- Las interacciones actinilo-actinilo (IAA) son cada vez más reconocidas por su papel en la construcción de nuevos compuestos de coordinación.
Objetivo del estudio:
- Para sintetizar y caracterizar un marco metálico orgánico (MOF) de neptunilo.
- Investigar la estabilidad de radiación de este MOF transuránico y su enlace orgánico bajo irradiación gamma.
- Explorar el potencial de las IAA en el diseño de nuevas topologías de MOF.
Principales métodos:
- Síntesis y difracción de rayos X monocristalino de un MOF de neptunilo utilizando ligandos orgánicos tetráedros tetrátopicos (NSM).
- Irradiación gamma del MOF y su enlace orgánico a dosis altas (hasta 6 MGy).
- Análisis posterior a la irradiación mediante difracción de rayos X y espectroscopia para evaluar los cambios estructurales y químicos.
Principales resultados:
- Se esclareció una nueva estructura aniónica de MOF, que presenta cadenas helicoidales de iones de neptunilo conectados por AAI y enlaces orgánicos.
- El MOF exhibe una topología de red sin precedentes, mostrando la utilidad de las AAI en la construcción de MOF.
- El neptunil MOF demostró una resistencia superior a la radiación en comparación con su vinculante orgánico, con cambios estructurales significativos observados solo después de aproximadamente 6 MGy de irradiación gamma.
Conclusiones:
- El estudio presenta el primer MOF transuránico que utiliza IAA, abriendo nuevas vías para el diseño y la topología de los MOF.
- El neptunil MOF sintetizado exhibe una estabilidad de radiación significativa, superando a su bloque de construcción orgánico.
- Este trabajo pone de relieve el potencial de los MOF basados en actinuros para aplicaciones que requieren una alta tolerancia a la radiación.
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