Helicity Control in the Aggregation of Achiral Squaraine Dyes in Solution and Thin Films.
circular dichroism
helical structures
self-assembly
squaraine dyes
supramolecular chemistry
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
04 Jan 2021
04 Jan 2021
Historique:
received:
03
06
2020
pubmed:
25
7
2020
medline:
25
7
2020
entrez:
25
7
2020
Statut:
ppublish
Résumé
Squaraine dyes are well known for their strong absorption in the visible regime. Reports on chiral squaraine dyes are, however, scarce. To address this gap, we here report two novel chiral squaraine dyes and their achiral counterparts. The presented dyes are aggregated in solution and in thin films. A detailed chiroptical study shows that thin films formed by co-assembling the chiral dye with its achiral counterpart exhibit exceptional photophysical properties. The circular dichroism (CD) of the co-assembled structures reaches a maximum when just 25 % of the chiral dye are present in the mixture. The solid structures with the highest relative CD effect are achieved when the chiral dye is used solely as a director, rather than the structural component. The chiroptical data are further supported by selected spin-filtering measurements using mc-AFM. These findings provide a promising platform for investigating the relationship between the dissymmetry of a supramolecular structure and emerging material properties rather than a comparison between a chiral molecular structure and an achiral counterpart.
Identifiants
pubmed: 32705726
doi: 10.1002/chem.202002695
pmc: PMC7839690
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
298-306Informations de copyright
© 2020 The Authors. Published by Wiley-VCH GmbH.
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