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Dinámicas de localización de electrones ultrarrápidos después de la transferencia de carga inducida por la foto
1Department of Chemistry, University of California, Berkeley, CA 94720, USA. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|August 11, 2000
Resumen
La transferencia de carga fotoinducida en [Ru(bpy) 3 2+ implica una deslocalización del estado excitado seguida de una localización del ligando, influenciada por la dinámica del disolvente. Esto revela la dinámica molecular interna y acoplada al medio ambiente en los estados de transferencia de carga.
Área de la Ciencia:
- La fotoquímica es la fotoquímica.
- Química Física es la química física.
- La dinámica molecular es la dinámica molecular.
Sus antecedentes:
- Comprender la dinámica molecular en etapa temprana después de la transferencia de carga inducida por la foto es crucial para controlar las reacciones químicas.
- El comportamiento de los estados excitados en complejos de metales de transición como [Ru(bpy) 3 2+ es altamente sensible a su entorno.
Objetivo del estudio:
- Para investigar la dinámica molecular ultrarrápida después de la transferencia de carga inducida por la foto en [Ru(bpy) 3 2+ .
- Para diferenciar entre la dinámica molecular acoplada al disolvente y la dinámica molecular interna en la evolución del estado excitado.
Principales métodos:
- Medidas de anisotropía de absorción con resolución de tiempo de femtosegundos.
- Utilizando soluciones de nitrilo para el estudio de [Ru(bpy) 3) 2+ (bpy = 2,2'-bipiridina).
Principales resultados:
- Se observó una dependencia de tiempo atribuida a la deslocalización del estado excitado sobre los ligandos, seguida de la localización de la carga en un solo ligando.
- Propuesta de acoplamiento del proceso de localización a la dinámica de solvación no difusiva.
- Se encontró que la evolución espectral relacionada con el movimiento del paquete de ondas en la superficie del estado excitado era independiente del disolvente.
Conclusiones:
- La evolución de los estados de transferencia de carga implica dos contribuciones distintas: una fuertemente acoplada al disolvente circundante y otra gobernada por potenciales moleculares internos.
- Estos hallazgos proporcionan información sobre los procesos fundamentales que rigen la dinámica del estado excitado en los complejos de metales de transición.
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