![]() If you are the author of this article, you do not need to request permission to reproduce figuresĪnd diagrams provided correct acknowledgement is given. Provided correct acknowledgement is given. If you are an author contributing to an RSC publication, you do not need to request permission Please go to the Copyright Clearance Center request page. To request permission to reproduce material from this article in a commercial publication, Provided that the correct acknowledgement is given and it is not used for commercial purposes. ![]() ![]() 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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