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1 Polish Journal of Chemistry

1 2008

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Multi-Pulse Excitation Reveals a Novel Excited State Pathway in a Peryleneimide-Pentaphenylene Dyad

Fron F., Schweitzer G., Jacob J., Müllen K., Van der Auweraer M.

Polish Journal of Chemistry

2008

Vol. 82, nr 4

701-713

The excited state properties of a peryleneimide-pentaphenylenedyad were in vestigated in detail using pump-probe, single photon timing and three-beam pulsed experiments. Upon excitation with 395 nm pulses ultrafast energy transfer was found to occur from the pentaphenylene to the perylene subunit. In polar solvents this excitation energy transfer is followed by charge transfer from the electron donor pentaphenylene to the electron acceptor perylene. A three-beam femtosecond transient absorption technique revealed the relaxation dynamics of a higher lying singlet state of the peryleneimide subunit to occur on a picoseconds time scale. These results demonstrate the potential use of the threebeam femtosecond technique in manipulating excited states processes.