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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 28289.0, MPI für Polymerforschung / MPI Polymerforschung
Investigation of molecular dimers by ensemble and single molecule spectroscopy
Authors:Christ, T.; Petzke, F.; Bordat, P.; Herrmann, A.; Reuther, E.; Müllen, Klaus; Basche, T.
Date of Publication (YYYY-MM-DD):2002-07
Title of Journal:Journal of Luminescence
Journal Abbrev.:J. Lumines.
Issue / Number:1-4
Start Page:23
End Page:33
Review Status:No review
Audience:Not Specified
Abstract / Description:We have investigated molecular dimers with different electronic coupling strengths by bulk and single molecule spectroscopy. In one of the dimers the two monomers (perylene-monoimide) are directly connected via a single bond while in the other one they are separated by the benzil motif. The close proximity of the monomers in the first case gives rise to excitonic band splitting which is clearly observable in the bulk absorption spectra. For the benzil structure the electronic interactions are governed by Forster-type energy hopping between the monomers, Fluorescence intensity trajectories at the single molecule level show one-step and two-step bleaching behaviour which appears to be very similar for both dimers. However, emission spectra recorded simultaneously with the trajectories indicate spectral changes which allow to distinguish between weakly and strongly coupled dimers. In the latter case the spectral shape changes significantly when excitonic coupling has been lifted because of photochemical transformation of one of the monomers, (C) 2002 Elsevier Science B.V. All rights reserved.
Free Keywords:single molecule spectroscopy; electronic interactions; excitons; molecular aggregates
Comment of the Author/Creator:Date: 2002, JUL
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Univ Mainz, Inst Chem Phys, Welderweg 11, D-55099 Mainz, Germany
Identifiers:ISI:000177021700005 [ID No:1]
ISSN:0022-2313 [ID No:2]
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