| Autor: |
Heinz A. Staab, M. E. Michel-Beyerie, Christine Anders, G. Voit, H. Heitele, F. Pöllinger, C. Musewal, Michael Futscher |
| Rok vydání: |
1996 |
| Předmět: |
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| Zdroj: |
Berichte der Bunsen-Gesellschaft für Physikalische Chemie |
| ISSN: |
0005-9021 |
| DOI: |
10.1002/bbpc.19961001226 |
| Popis: |
Photoinduced charge separation and recombination in a series of cyclophane-bridged porphyrin-quinone systems (PQ) in toluene solution have been investigated by means of sub-ps time-resolved absorption spectroscopy. Temporal profiles and transient spectra of the porphyrin cation (P+) show the photoinduced formation and decay of the charge-separated state P+Q−. The rate of charge recombination in these systems (P+Q−PQ) is investigated as a function of the reaction free energy ΔG in the range (- ΔG) = 1.54–1.98 eV, which is in the so-called inverted region of electron transfer. Combining values for charge separation and recombination the dependence of the electron transfer rate on ΔG fully covers the normal and inverted regions ((- ΔG) = (-)0.02-1.9 8 eV) with the rate varying over more than three orders of magnitude (≈2·109-5·1012s−1). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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