Parallel polar dimers in the columnar self‐assembly of umbrella‐shaped subphthalocyanine mesogens
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- The self-assembly of umbrella-shaped mesogens is explored with subphthalocyanine cores and oligo(thienyl) arms with different lengths in the light of their application as light-harvesting and photoconducting materials. While the shortest arm derivatives self-assemble in a conventional columnar phase with a single mesogen as a repeating unit, the more extended derivatives generate dimers that pile up into liquid crystalline columns. In contrast to the antiparallel arrangement known from single crystals, the present mesogens align as parallelThe self-assembly of umbrella-shaped mesogens is explored with subphthalocyanine cores and oligo(thienyl) arms with different lengths in the light of their application as light-harvesting and photoconducting materials. While the shortest arm derivatives self-assemble in a conventional columnar phase with a single mesogen as a repeating unit, the more extended derivatives generate dimers that pile up into liquid crystalline columns. In contrast to the antiparallel arrangement known from single crystals, the present mesogens align as parallel dimers in polar columnar phases as confirmed by X-ray scattering, experimental densities, dielectric spectroscopy, second harmonic generation, alignment, and conductivity studies. UV–vis and fluorescence spectroscopies reveal a broad absorption in the visible range and only weak emission of the Q-band. Thus, these light-collecting molecules forming strongly polar columnar mesophases are attractive for application in the area of photoconductive materials.…
Autor(en): | Matthias LehmannORCiD, Maximilian Baumann, Martin Lambov, Alexey Eremin |
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URN: | urn:nbn:de:bvb:20-opus-256343 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Fakultät für Chemie und Pharmazie |
Fakultät für Chemie und Pharmazie / Institut für Organische Chemie | |
Sprache der Veröffentlichung: | Englisch |
Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | Advanced Functional Materials |
Erscheinungsjahr: | 2021 |
Band / Jahrgang: | 31 |
Heft / Ausgabe: | 38 |
Aufsatznummer: | 2104217 |
Originalveröffentlichung / Quelle: | Advanced Functional Materials (2021), 31:38, 2104217. DOI: 10.1002/adfm.202104217 |
DOI: | https://doi.org/10.1002/adfm.202104217 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 54 Chemie / 547 Organische Chemie |
Freie Schlagwort(e): | columnar phases; ferroelectrics; liquid crystal alignment; organic semiconductors; parallel polar dimers; subphthalocyanine; umbrella-shaped mesogens |
Datum der Freischaltung: | 17.02.2022 |
Lizenz (Deutsch): | CC BY-NC: Creative-Commons-Lizenz: Namensnennung, Nicht kommerziell 4.0 International |