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  Investigation of molecular dimers by ensemble and single molecule spectroscopy

Christ, T., Petzke, F., Bordat, P., Herrmann, A., Reuther, E., Müllen, K., et al. (2002). Investigation of molecular dimers by ensemble and single molecule spectroscopy. Journal of Luminescence, 98(1-4), 23-33.

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 Creators:
Christ, T., Author
Petzke, F., Author
Bordat, P.1, Author              
Herrmann, A.1, Author              
Reuther, E.1, Author              
Müllen, Klaus1, Author              
Basche, T., Author
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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Free keywords: single molecule spectroscopy; electronic interactions; excitons; molecular aggregates
 Abstract: 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.

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Language(s): eng - English
 Dates: 2002-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28289
ISI: 000177021700005
 Degree: -

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Title: Journal of Luminescence
  Alternative Title : J. Lumines.
Source Genre: Journal
 Creator(s):
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Publ. Info: -
Pages: - Volume / Issue: 98 (1-4) Sequence Number: - Start / End Page: 23 - 33 Identifier: ISSN: 0022-2313