Alfonso Hernandez, Laura and Nelson, Tammie and Gelin, Maxim F. and Lupton, John M. and Tretiak, Sergei and Fernandez-Alberti, Sebastian (2016) Interference of Interchromophoric Energy-Transfer Pathways in pi-Conjugated Macrocycles. Journal of Physical Chemistry Letters, 7 (23). pp. 4936-4944. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
The interchromophoric energy-transfer pathways between weakly coupled units in a pi-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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-HARVESTING COMPLEXES; NONLINEAR POLARIZABILITIES; ELECTRONIC EXCITATIONS; MOLECULAR-DYNAMICS; CHARGE-TRANSFER; EXCITED-STATES; POLYMERS; CYCLOPARAPHENYLENES; FLUORESCENCE; MORPHOLOGY; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Apr 2019 12:29 |
| Last Modified: | 10 Apr 2019 12:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3889 |
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