TY  - JOUR
A1  - Herbst, Stefanie
A1  - Soberats, Bartolome
A1  - Leowanawat, Pawaret
A1  - Stolte, Matthias
A1  - Lehmann, Matthias
A1  - Würthner, Frank
T1  - Self-assembly of multi-stranded perylene dye J-aggregates in columnar liquid-crystalline phases
T2  - Nature Communications
N2  - 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.
KW  - liquid crystals
KW  - self-assembly
Y1  - 2018
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/31991
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-319914
VL  - 9
ER  -