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Energy Transfer Between Squaraine Polymer Sections: From helix to zig-zag and All the Way Back

Please always quote using this URN: urn:nbn:de:bvb:20-opus-159607
  • Joint experimental and theoretical study of the absorption spectra of squaraine polymers in solution provide evidence that two different conformations are present in solution: a helix and a zig-zag structure. This unique situation allows investigating ultrafast energy transfer processes between different structural segments within a single polymer chain in solution. The understanding of the underlying dynamics is of fundamental importance for the development of novel materials for light-harvesting and optoelectronic applications. We combineJoint experimental and theoretical study of the absorption spectra of squaraine polymers in solution provide evidence that two different conformations are present in solution: a helix and a zig-zag structure. This unique situation allows investigating ultrafast energy transfer processes between different structural segments within a single polymer chain in solution. The understanding of the underlying dynamics is of fundamental importance for the development of novel materials for light-harvesting and optoelectronic applications. We combine here femtosecond transient absorption spectroscopy with time-resolved 2D electronic spectroscopy showing that ultrafast energy transfer within the squaraine polymer chains proceeds from initially excited helix segments to zig-zag segments or vice versa, depending on the solvent as well as on the excitation wavenumber. These observations contrast other conjugated polymers such as MEH-PPV where much slower intrachain energy transfer was reported. The reason for the very fast energy transfer in squaraine polymers is most likely a close matching of the density of states between donor and acceptor polymer segments because of very small reorganization energy in these cyanine-like chromophores.show moreshow less

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Metadaten
Author: Christoph Lambert, Sebastian F. Völker, Federico Koch, Alexander Schmiedel, Marco Holzapfel, Alexander Humeniuk, Merle I. S. RöhrORCiD, Roland MitricORCiD, Tobias Brixner
URN:urn:nbn:de:bvb:20-opus-159607
Document Type:Preprint
Faculties:Fakultät für Chemie und Pharmazie / Institut für Organische Chemie
Fakultät für Chemie und Pharmazie / Institut für Physikalische und Theoretische Chemie
Language:English
Parent Title (English):Journal of the American Chemical Society
Year of Completion:2015
Source:Journal of the American Chemical Society, 2015, 137 (24), pp 7851–7861 DOI: 10.1021/jacs.5b03644
URL:http://dx.doi.org/10.1021/jacs.5b03644
DOI:https://doi.org/10.1021/jacs.5b03644
Sonstige beteiligte Institutionen:Center for Nanosystems Chemistry (CNC), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 541 Physikalische Chemie
Tag:energy transfer dynamics; squaraine polymer
PACS-Classification:30.00.00 ATOMIC AND MOLECULAR PHYSICS
Release Date:2018/03/23
Note:
This document is the unedited Author's version of a Submitted Work that war subsequently accepted for publication in Journal of the American Chemical Society, copyright American Chemical Society after peer review. To access the final edited and published work see doi:10.1021/jacs.5b03644.
Licence (German):License LogoDeutsches Urheberrecht