Artículo
Interference of Interchromophoric Energy-Transfer Pathways in π-Conjugated Macrocycles
Alfonso Hernandez, Laura
; Nelson, Tammie; Gelin, Maxim F.; Lupton, John M.; Tretiak, Sergei; Fernández Alberti, Sebastián
Fecha de publicación:
12/2016
Editorial:
American Chemical Society
Revista:
Journal of Physical Chemistry Letters
ISSN:
1948-7185
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The interchromophoric energy-transfer pathways between weakly coupled units in a π-conjugated phenylene-ethynylene macrocycle and its half-ring analogue have been investigated using the nonadiabatic excited-state molecular dynamics approach. To track the flow of electronic transition density between macrocycle units, we formulate a transition density flux analysis adapted from the statistical minimum flow method previously developed to investigate vibrational energy flow. Following photoexcitation, transition density is primarily delocalized on two chromophore units and the system undergoes ultrafast energy transfer, creating a localized excited state on a single unit. In the macrocycle, distinct chromophore units donate transition density to a single acceptor unit but do not interchange transition density among each other. We find that energy transfer in the macrocycle is slower than in the corresponding half ring because of the presence of multiple interfering energy-transfer pathways. Simulation results are validated by modeling the fluorescence anisotropy decay.
Palabras clave:
Non-Adiabatic Molecular Dynamics
,
Excited States
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Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Alfonso Hernandez, Laura; Nelson, Tammie; Gelin, Maxim F.; Lupton, John M.; Tretiak, Sergei; et al.; Interference of Interchromophoric Energy-Transfer Pathways in π-Conjugated Macrocycles; American Chemical Society; Journal of Physical Chemistry Letters; 7; 23; 12-2016; 4936-4944
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