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Iones de feniloxenio: más parecidos a los iones de fenilnitreno que a los fenilnitrenos isoelectrónicos?
Patrick J Hanway1, Arthur H Winter
1Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.
Journal of the American Chemical Society
|March 10, 2011
Resumen
El ion feniloxenio es el ion feniloxenio.
Área de la Ciencia:
- Química computacional es la química computacional.
- Química cuántica es la química cuántica.
- Química teórica es la química teórica.
Sus antecedentes:
- Los iones de feniloxenio (Ph-O(+)) son isoelectrónicos de los fenilnitrenos.
- Comprender sus estados electrónicos es crucial para la reactividad química.
- Las asignaciones anteriores de bandas de espectroscopia de fotoelectrones UV para los radicales fenoxi pueden requerir una revisión.
Objetivo del estudio:
- Para calcular los estados electrónicos y las energías de los iones de feniloxenio.
- Para comparar la estructura electrónica del ion feniloxenio con el fenilnitreno.
- Investigar el efecto de los sustituyentes en los estados electrónicos de los iones de feniloxenio.
Principales métodos:
- Se empleó la teoría de múltiples referencias CASPT2/pVTZ.
- Se calcularon las geometrías y las energías de los estados electrónicos.
- Se realizaron análisis de CASPT2 para iones de feniloxenio sustituidos.
Principales resultados:
- El singlet de caparazón cerrado ((1)A(1)) es el estado fundamental del ion feniloxenio.
- Existe una brecha energética significativa (22,1 kcal/mol) entre los estados del singlete básico y el triplete más bajo.
- Se analizaron los efectos de sustitución en las brechas de energía singlet-triplet, mostrando correlaciones lineales y no lineales.
- Los sustituyentes meta-donantes pueden estabilizar estados de baja energía en capas abiertas.
Conclusiones:
- El orden de los estados electrónicos del ion feniloxenio difiere del del fenilnitreno.
- Los resultados computacionales sugieren revisar las asignaciones de espectroscopia de fotoelectrones UV.
- Las reacciones de estado fundamental de los iones de feniloxenio pueden parecerse más a los iones de arilnitrenio que a los arilnitrenos.
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