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La inusual estructura electrónica de los complejos de hierro dinitrosil
1Lehrstuhl für Theoretische Chemie, Universität Bonn, Bonn D-53115, Germany. shengfa.ye@thch.uni-bonn.de
Journal of the American Chemical Society
|March 4, 2010
Resumen
Las estructuras electrónicas de los complejos de hierro dinitrosil (DNIC) se dilucidaron utilizando la teoría funcional de la densidad de Kohn-Sham. Esto revela un patrón único de unión y división del campo de ligandos crucial para la química de los clústeres de hierro y azufre.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química bioorgánica Química bioorgánica.
- Química computacional es la química computacional.
Sus antecedentes:
- Los complejos de hierro dinitrosil (DNIC) juegan un papel en la química de los grupos de hierro-azufre.
- La estructura electrónica precisa de los DNIC sigue siendo poco conocida, lo que dificulta las ideas mecanicistas.
Objetivo del estudio:
- Determinar las estructuras electrónicas experimentalmente validadas de {Fe(NO) 2} ((9) y su forma reducida {Fe(NO) 2} ((10).
- Para dilucidar las características de los campos de enlace y ligando de los DNIC.
Principales métodos:
- Cálculos de la teoría funcional de la densidad de Kohn-Sham.
- Análisis de estructuras electrónicas para reproducir parámetros experimentales.
- Caracterización de los estados de espín y acoplamiento en especies DNIC.
Principales resultados:
- La estructura electrónica de {Fe(NO) 2}(9) es un híbrido de estados férricos y ferrosos con acoplamiento antiferromagnético.
- {Fe(NO) 2}(10) presenta un centro ferroso de alto espín acoplado a ligandos triplet de nitrosilo.
- Se identificó una interacción de enlace covalente y un patrón de división del campo de ligando "uno por encima de cuatro".
Conclusiones:
- Las estructuras electrónicas determinadas proporcionan una comprensión detallada de los DNIC.
- El inusual patrón de división del campo de ligandos ofrece una visión mecanicista de las transformaciones de clúster de hierro-azufre que involucran a los DNIC.
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