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Solvent-mediated aggregate formation of PNDIT2 : decreasing the available conformational subspace by introducing locally highly ordered domains

Title data

Meyer, Deborah L. ; Matsidik, Rukiya ; Hüttner, Sven ; Sommer, Michael ; Biskup, Till:
Solvent-mediated aggregate formation of PNDIT2 : decreasing the available conformational subspace by introducing locally highly ordered domains.
In: Physical Chemistry Chemical Physics. Vol. 20 (2018) Issue 4 . - pp. 2716-2723.
ISSN 1463-9084
DOI: https://doi.org/10.1039/C7CP07725D

Abstract in another language

The high-mobility n-type donor/acceptor polymer PNDIT2 is well-known to form aggregates in solution depending on the solvent used. To gain additional insight into this process, we probed the local environment of triplet excitons in two different solvents and with two different polymer chain lengths using time-resolved electron paramagnetic resonance (TREPR) spectroscopy. Results clearly show aggregation to introduce a high degree of local order in the polymer and to dramatically enhance the delocalisation of the exciton. Furthermore, triplet exciton delocalisation is only affected by the solvent used and hence by aggregate formation, not by chain length. Finally, aggregation changes the mode of delocalisation from intrachain to interchain when forming aggregates, the latter mode dominating as well in thin films. Taken together, TREPR proves to be a valuable tool for investigating aggregation and order in polymers on a molecular length-scale, ideally complementing preceding optical data.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Advance Article
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy > Junior Professorship Solar Energy - Juniorprof. Dr. Sven Hüttner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 12 Jan 2018 11:34
Last Modified: 29 Jan 2018 08:43
URI: https://eref.uni-bayreuth.de/id/eprint/41723