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Síntesis, estructura y magnetismo de un complejo de nitrosilo de elemento f, (C5Me4H) 3UNOO
Nathan A Siladke1, Katie R Meihaus, Joseph W Ziller
1Department of Chemistry, University of California, Irvine, California 92627-2025, USA.
Journal of the American Chemical Society
|December 6, 2011
Resumen
El uranio reacciona con el óxido nítrico para formar un nuevo complejo de nitrosilo. Este estudio revela una interacción de enlace única entre el uranio y el ligando de nitrosilo, lo que indica una reducción del óxido nítrico.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química del Uranio La Química del Uranio
- Complejos de nitrosilo complejos de nitrosilo.
Sus antecedentes:
- Los complejos de uranio son de interés debido a sus propiedades electrónicas únicas.
- Los ligandos de nitrosilo (NO) pueden coordinarse con metales en varios estados de oxidación.
- La comprensión de la unión en los nitrosilos del elemento f es crucial para la catálisis y la ciencia de los materiales.
Objetivo del estudio:
- Para sintetizar y caracterizar el primer f-elemento nitrosil complejo.
- Para investigar la estructura electrónica y la unión en el complejo de nitrosilo de uranio.
- Para explorar la reactividad del complejo sintetizado.
Principales métodos:
- Síntesis del complejo de uranio nitrosilo [(C5Me4H) 3U]NO.NO.
- Cristalografía de rayos X para la determinación estructural.
- Las mediciones espectroscópicas (UV-Vis, IR, RMN) y magnéticas.
- Cálculos de la Teoría Funcional de la Densidad (DFT).
Principales resultados:
- Formación del primer complejo de nitrosilo del elemento f, [(C5Me4H) 3U]NO.
- La cristalografía de rayos X reveló un ángulo lineal U-N-O pero un enlace N=O corto (1.231 Å) y un enlace U-N (2.013 Å).
- La evidencia sugiere la reducción de NO al anión nitrosilo (NO-) coordinado a U(IV), con U(3+) actuando como el reductor.
- Los cálculos de DFT y los datos espectroscópicos confirman las interacciones π entre las órbitas U 5f y NO π*.
- El complejo exhibe un paramagnetismo independiente de la temperatura (1,36 μB a temperatura ambiente).
- El complejo forma un adducto con Al2Me6.6.
Conclusiones:
- El estudio presenta el primer complejo de nitrosilo de elemento f, [(C5Me4H) 3U]NO.
- El enlace se caracteriza por un significativo π-backbonding entre los orbitales de uranio 5f y los orbitales de nitrosilo π*, dando lugar a una estructura U(IV) -NO-.
- Esta interacción explica la geometría lineal observada y el enlace corto U-N.
- El complejo muestra propiedades magnéticas y reactividad únicas.
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