Ion-Pair Dynamics upon Photoinduced Electron Transfer Monitored by Pump–Pump–Probe Spectroscopy
| Autor: | Bernhard Felix Lang, Joseph Beckwith, Jakob Grilj, Eric Vauthey |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Photoinduced electron transfer 0104 chemical sciences Ion chemistry.chemical_compound chemistry Picosecond ddc:540 General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Acetonitrile Spectroscopy Tetrahydrofuran Perylene Recombination |
| Zdroj: | Journal of Physical Chemistry Letters, Vol. 10, No 13 (2019) pp. 3688-3693 |
| ISSN: | 1948-7185 |
| Popis: | The excited-state dynamics of the radical anion of perylene (Pe) generated upon bimolecular photoinduced electron transfer (PET) with a donor was investigated using broadband pump–pump–probe spectroscopy. It was found to depend on the age of the anion, that is, on the time interval between the first pump pulse that triggers PET and the second one that excites the ensuing Pe anion (Pe•–). These differences, observed in acetonitrile but not in tetrahydrofuran, report on the evolution of the PET product from an ion pair to free ions. Two photoinduced charge recombination pathways of the ion pair to the neutral Pe*(S1) + donor state were identified: one occurring in a few picoseconds from Pe•–*(D1) and one taking place within 100–200 fs from Pe•–*(Dn>1). Both processes are sensitive to the interionic distance over different length scales and thus serve as molecular rulers. |
| Databáze: | OpenAIRE |
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