This article in other publications, without requesting further permission from the RSC, C, 2023, Accepted ManuscriptĬreative Commons Attribution-NonCommercial 3.0 Unported Licence. Thus, in this work we sucesfully applied two approaches to prepare for the first time LC NDI J-aggregates, which are highly appreciated materials for photonic applications.Ĭolumnar liquid-crystalline J-aggregates based on N-core-substituted naphthalene diimidesĮ. Surprisingly, this mechanochromic behavior is induced by a molecular reorganization of the NDI cores, which is accompanied by a fluorescence turn on. On the other hand, the NDI 2, with N-butyl groups at the imide positions, spontaneously self-assembles by cofacial π-π stacking into columnar H-aggregates however mechanical shearing of the samples induces the reversible formation of weakly coupled J-aggregates. Quantum mechanics calculations (GFN2-xTB method) and middle angle X-ray scattering confirmed the uncommon columnar architecture for the LC 1 which enable strong J-type exciton coupling between NDI cores. The NDI 1, with free imidic NH groups, spontanously self-assembles via hydrogen bonds into a columnar LC structure where the chromophores organize with the cores parallel to the columnar axis. We report two distinct approaches to prepare unprecedented liquid-crystalline (LC) J-aggregates based on bis-core-dendronized naphthalene diimides (NDIs).
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