Controlling the helicity of π-conjugated oligomers by tuning the aromatic backbone twist.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
21 Jan 2022
21 Jan 2022
Historique:
received:
09
10
2021
accepted:
30
12
2021
entrez:
22
1
2022
pubmed:
23
1
2022
medline:
23
1
2022
Statut:
epublish
Résumé
The properties of π-conjugated oligomers and polymers are commonly controlled by side group engineering, main chain engineering, or conformational engineering. The last approach is typically limited to controlling the dihedral angle around the interring single bonds to prevent loss of π-conjugation. Here we propose a different approach to conformational engineering that involves controlling the twist of the aromatic units comprising the backbone by using a tether of varying lengths. We demonstrate this approach by synthesizing an inherently twisted building unit comprised of helically locked tethered acenes, bearing acetylene end-groups to enable backbone extension, which was applied in a series of nine helical oligomers with varying backbone length and twist. We find that the optical and electronic properties of π-conjugated systems may be determined by the additive, antagonistic, or independent effects of backbone length and twist angle. The twisted oligomers display chiral amplification, arising from the formation of secondary helical structures.
Identifiants
pubmed: 35064118
doi: 10.1038/s41467-022-28072-7
pii: 10.1038/s41467-022-28072-7
pmc: PMC8782941
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
451Subventions
Organisme : EC | EU Framework Programme for Research and Innovation H2020 | H2020 Priority Excellent Science | H2020 European Research Council (H2020 Excellent Science - European Research Council)
ID : 850836
Informations de copyright
© 2022. The Author(s).
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