Self-assembly of multi-stranded perylene dye J-aggregates in columnar liquid-crystalline phases

Stefanie Herbst, Bartolome Soberats, Pawaret Leowanawat, Matthias Stolte, Matthias Lehmann () and Frank Würthner ()
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Stefanie Herbst: Universität Würzburg
Bartolome Soberats: Universität Würzburg
Pawaret Leowanawat: Universität Würzburg
Matthias Stolte: Universität Würzburg
Matthias Lehmann: Universität Würzburg
Frank Würthner: Universität Würzburg

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Many discoid dyes self-assemble into columnar liquid-crystalline (LC) phases with packing arrangements that are undesired for photonic applications due to H-type exciton coupling. Here, we report a series of crystalline and LC perylene bisimides (PBIs) self-assembling into single or multi-stranded (two, three, and four strands) aggregates with predominant J-type exciton coupling. These differences in the supramolecular packing and optical properties are achieved by molecular design variations of tetra-bay phenoxy-dendronized PBIs with two N–H groups at the imide positions. The self-assembly is driven by hydrogen bonding, slipped π–π stacking, nanosegregation, and steric requirements of the peripheral building blocks. We could determine the impact of the packing motifs on the spectroscopic properties and demonstrate different J- and H-type coupling contributions between the chromophores. Our findings on structure–property relationships and strong J-couplings in bulk LC materials open a new avenue in the molecular engineering of PBI J-aggregates with prospective applications in photonics.

Date: 2018
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DOI: 10.1038/s41467-018-05018-6

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