Photoinduced multistep energy and electron transfer in an oligoaniline-oligo(p-phenylene vinylene)-fullerene triad
| Autor: | Ramos, AM, Meskers, SCJ, van Hal, PA, Knol, J, Hummelen, JC, Janssen, RAJ, Marcos Ramos, Alicia, Meskers, Stefan C.J., Janssen, René A.J. |
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| Přispěvatelé: | Stratingh Institute of Chemistry, University of Groningen, Chemistry of (Bio)organic Materials and Devices, Macromolecular and Organic Chemistry, Molecular Materials and Nanosystems |
| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
LASER FLASH-PHOTOLYSIS
Fullerene Photoluminescence Chemistry ZINC PORPHYRIN Triad (anatomy) Chromophore PORPHYRIN-FULLERENE TRIAD Photochemistry Photoexcitation Electron transfer medicine.anatomical_structure SELF-ASSEMBLED MONOLAYERS Covalent bond Phenylene CHARGE RECOMBINATION DYNAMICS N-METHYLFULLEROPYRROLIDINE PHOTOPHYSICAL PROPERTIES medicine PHOTOCURRENT GENERATION SOLVENT DEPENDENCE Physical and Theoretical Chemistry <60>FULLERENE-LINKED OLIGOTHIOPHENES |
| Zdroj: | The Journal of Physical Chemistry A, 107(44), 9269-9283. AMER CHEMICAL SOC Journal of Physical Chemistry A, 107(44), 9269-9283. American Chemical Society |
| ISSN: | 1089-5639 1520-5215 |
| Popis: | A donor-donor-acceptor triad, OAn-OPV-C-60, With a redox gradient has been synthesized by covalently linking an oligoaniline (OAn), an oligo(p-phenylene vinylene) (OPV), and a fullerene (C-60) in a nonconjugated linear array. Photoluminescence and femtosecond pump-probe spectroscopy studies reveal that photoexcitation of any of the three chromophores of this triad in a polar solvent results in formation of the OAn(-)OPV(+)-C-60(-) charge-separated state, after an efficient ultrafast ( 1 ns) due to weak electronic coupling between the distant redox sites in the excited state. The stabilization gained is more than I order of magnitude in time. The experimental results are found to be in qualitative agreement with Marcus theory. In thin films, the OAn(+)-OPV-C-60(-) state is formed at a higher rate and in higher quantum yield than in solution. |
| Databáze: | OpenAIRE |
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