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Síntesis y caracterización de un complejo de uranio estable en agua
Radmila Faizova1, Rosario Scopelliti1, Anne-Sophie Chauvin1
1Institut des Sciences et Ingénierie Chimiques , Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland.
Journal of the American Chemical Society
|October 6, 2018
Resumen
Los investigadores estabilizaron el uranyl ((V) en agua utilizando un nuevo ligando aminocarboxilato de polidentato. Los complejos resultantes muestran estabilidad en condiciones neutrales a alcalinas, ofreciendo nuevas vías en la química del uranio.
Área de la Ciencia:
- Química inorgánica
- Química de coordinación
- Química del uranio
Sus antecedentes:
- El uranio (V) es un estado de oxidación transitorio del uranio, difícil de aislar y estudiar.
- La estabilización del uranio en solución acuosa es crucial para comprender su comportamiento químico y sus aplicaciones potenciales.
Objetivo del estudio:
- Síntesis y caracterización de nuevos complejos de uranilio V capaces de existir en medios acuosos.
- Investigar la estabilidad y las propiedades de estos complejos en condiciones de pH variables.
Principales métodos:
- Síntesis de complejos mono-nucleares [UO2 (dpaea) ]X utilizando un ligando aminocarboxilato polidentado (dpaeaH2).
- Aislamiento de una solución orgánica anaeróbica.
- Caracterización cristalográfica y espectroscópica tanto en soluciones acuosas como orgánicas.
Principales resultados:
- Aislamiento y caracterización exitosos de los complejos de uranyl (V) con el ligando dpaea.
- Estabilidad demostrada de los complejos en agua anaeróbica a pH 7-10 durante varios días.
- Desproporción observada de los complejos a un pH ≤ 6.
Conclusiones:
- Un nuevo ligando de aminocarboxilato polidentado estabiliza eficazmente el uranio en solución acuosa.
- Los complejos de uranio sintetizados exhiben una estabilidad significativa en ambientes acuosos neutrales a alcalinos.
- Este trabajo proporciona una base para una mayor exploración de la química del uranio en el agua.
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