Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 6: Electronic Structure and Spectroscopy I
CPP 6.3: Vortrag
Montag, 27. März 2006, 15:00–15:15, ZEU 114
Time-Resolved Measurements of Intramolecular Energy Transfer in Single Donor/Acceptor Dyads — •Gerald Hinze1, Fabian Nolde2, Klaus Müllen2, and Thomas Basché1 — 1Institut für Physikalische Chemie, Universität Mainz, Jakob-Welder-Weg 11, 55099 Mainz, Germany — 2Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
Electronic excitation energy transfer has been measured in single donor/acceptor dyads. The specific design of donor/acceptor and the spacer in between force a rigid geometry of the overall molecular structure. Distance and orientation of the two chromophores were chosen such that both, donor as well as acceptor emission is observed. The significantly smaller photostability of the donor allows for time-resolved measurements of the acceptor emission with and without energy transfer from the donor. By analyzing the differences of the rise/decay profiles of the acceptor emission for both pathways, we could determine time constants of energy transfer with high accuracy. At the same time, emission spectra could be obtained for each dyad. Due to inhomogeneous broadening of the electronic transitions, spectral features and therefore energy transfer efficiencies vary from molecule to molecule.
We find a correlation between the spectral overlap and the energy transfer rates which seems to be in accordance with standard Förster theory. However, on average the energy transfer proceeds faster (f~1.8) than what would have been expected.