Columnar Liquid Crystals from Star‐Shaped Conjugated Mesogens as Nano‐Reservoirs for Small Acceptors
Please always quote using this URN: urn:nbn:de:bvb:20-opus-218014
- Shape‐persistent conjugated mesogens with oligothiophene arms of different lengths have been synthesized. Such mesogens possess free intrinsic space between their conjugated arms. They form columnar liquid‐crystalline phases, in which the void is filled by dense helical packing in the neat phase similar to an oligo(phenylene vinylene) derivative of equal size. The void can also be compensated by the inclusion of the small acceptor molecule 2,4,7‐trinitrofluorenone. In solution, the acceptor interacts with the core as the largest π‐surface,Shape‐persistent conjugated mesogens with oligothiophene arms of different lengths have been synthesized. Such mesogens possess free intrinsic space between their conjugated arms. They form columnar liquid‐crystalline phases, in which the void is filled by dense helical packing in the neat phase similar to an oligo(phenylene vinylene) derivative of equal size. The void can also be compensated by the inclusion of the small acceptor molecule 2,4,7‐trinitrofluorenone. In solution, the acceptor interacts with the core as the largest π‐surface, while in the solid material, it is incorporated between the arms and sandwiched by the star‐shaped neighbours along the columnar assemblies. The TNF acceptors are not nanosegregated from the star‐shaped donors, thus the liquid crystal structure converts to a nano‐reservoir for TNF (endo‐receptor). These host–guest arrangements are confirmed by comprehensive X‐ray scattering experiments and solid‐state NMR spectroscopy. This results in ordered columnar hexagonal phases at high temperatures, which change to helical columnar mesophases or to columnar soft crystals at room temperature.…
Author: | Martin Lambov, Nicola Hensiek, Ann‐Christin Pöppler, Matthias Lehmann |
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URN: | urn:nbn:de:bvb:20-opus-218014 |
Document Type: | Journal article |
Faculties: | Fakultät für Chemie und Pharmazie / Institut für Organische Chemie |
Language: | English |
Parent Title (English): | ChemPlusChem |
Year of Completion: | 2020 |
Volume: | 85 |
Issue: | 10 |
First Page: | 2219 |
Last Page: | 2229 |
Source: | ChemPlusChem 2020, 85(10):2219-2229. DOI: 10.1002/cplu.202000341 |
DOI: | https://doi.org/10.1002/cplu.202000341 |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Tag: | donor-acceptor interactions; host-guest systems; intrinsic free space; liquid crystals; mesogens |
Release Date: | 2021/08/19 |
Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |