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Control vibratorio de los efectos de covalencia relacionados con los sitios activos de las enzimas de molibdeno
Benjamin W Stein1,2, Jing Yang1, Regina Mtei1
1Department of Chemistry and Chemical Biology , The University of New Mexico , MSC 032060, 1 University of New Mexico , Albuquerque , New Mexico 87131 , United States.
Journal of the American Chemical Society
|September 13, 2018
Resumen
Los complejos de metioleno de metales de transición exhiben estructuras electrónicas únicas y distorsiones de plegado impulsadas por un efecto pseudo-Jahn-Teller. Este estudio relaciona estas distorsiones con la transferencia de electrones en las enzimas de molibdeno.
Área de la Ciencia:
- Química inorgánica
- Química computacional
- La bioquímica
Sus antecedentes:
- Los complejos de ditoileno juegan un papel crucial en las enzimas de molibdeno.
- Comprender su estructura electrónica es clave para su reactividad.
Objetivo del estudio:
- Investigar la estructura electrónica de los complejos Cp2M ((benzenediotiolato) (M = Ti, V, Mo).
- Elucidar la contribución del plegamiento del metioleno a los potenciales de transferencia y reducción de electrones.
- Explicar el efecto pseudo-Jahn-Teller (PJT) en estos sistemas.
Principales métodos:
- Estudio espectroscópico multitecnológico: resonancia Raman, dicroísmo magnético circular, resonancia paramagnética de electrones y espectroscopia de fotoelectrones UV (UPS).
- Los cálculos teóricos.
- Comparación de los datos espectroscópicos para diferentes centros metálicos (Ti, V, Mo).
Principales resultados:
- La magnitud de la distorsión de plegado del ditoileno se correlaciona con la covalencia metal-ligando.
- El efecto pseudo-Jahn-Teller (PJT) impulsa las distorsiones de ángulo de plegado observadas.
- UPS de Cp2Mo(bdt) muestra una progresión vibrónica dominada por distorsiones activas por PJT.
- Las pequeñas diferencias de energía entre los orbitales de metal y azufre permiten cambios electrónicos y geométricos significativos.
Conclusiones:
- El efecto PJT es fundamental para la flexibilidad electrónica y geométrica de los metiolenos de metal de transición.
- Estos hallazgos proporcionan información sobre el mecanismo de transferencia de electrones en las enzimas de molibdeno.
- Los enfoques espectroscópicos y teóricos combinados son poderosos para estudiar el acoplamiento vibrónico.
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