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Issue 4, 2018
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Solvent-mediated aggregate formation of PNDIT2: decreasing the available conformational subspace by introducing locally highly ordered domains

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Abstract

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.

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

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Publication details

The article was received on 16 Nov 2017, accepted on 19 Dec 2017 and first published on 20 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP07725D
Citation: Phys. Chem. Chem. Phys., 2018,20, 2716-2723
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    Solvent-mediated aggregate formation of PNDIT2: decreasing the available conformational subspace by introducing locally highly ordered domains

    D. L. Meyer, R. Matsidik, S. Huettner, M. Sommer and T. Biskup, Phys. Chem. Chem. Phys., 2018, 20, 2716
    DOI: 10.1039/C7CP07725D

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