Cited by 7Surfactants and Colloidal SystemsPhotochemistry and Electron Transfer StudiesSupramolecular Self-Assembly in Materials

Aggregation of Amphiphilic Carbocyanines: Fluorination Favors Cylindrical Micelles over Bilayered Tubes

Singh, Abhishek Kumar, Schade, Boris, Wycisk, Virginia, Böttcher, Christoph, Haag, Rainer, von Berlepsch, Hans·2021·The Journal of Physical Chemistry B

Abstract

chains attached to the nitrogen atoms in the 1,1'-position, CF8O3, is reported. Depending on the dye concentration and the addition of MeOH, CF8O3 forms J- and H-aggregates in aqueous solutions. The aggregation behavior was investigated using steady-state absorption, linear dichroism, and fluorescence spectroscopy, as well as by cryogenic transmission electron microscopy (cryo-TEM). The J-band of the MeOH-free solution is monomer-like, rather broad, and less red-shifted with respect to the monomer absorption, indicating weak excitonic coupling and disorder effects. Cryo-TEM reveals a diversity of supramolecular structures, wherein linear and branched cylindrical micelles dominate. It is concluded that the high stiffness of fluoroalkyl chains does not allow the chains to splay and completely fill up the hydrophobic gap between opposing chromophores. This destabilizes the bilayers and favors the micellar structure motifs instead. The aggregates appearing at 30% MeOH show a split absorption spectrum consisting of a broad blue-shifted H-band and an accompanying sharp red-shifted J-band with perpendicular polarizations. These HJ-type aggregates are also composed of micellar fibers, but these bundle into rope-like strands. For 10% MeOH, a narrow bilayered tube is the dominating morphology. The observed MeOH dependence of aggregation reveals a clear cosolvent effect.

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Crossref · 10.1021/acs.jpcb.1c05128

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Authors
Singh, A. K., Schade, B., Wycisk, V., Böttcher, C., Haag, R., & von Berlepsch, H.
Affiliations
  • Freie Universität Berlin (DE)
  • Core Facility BioSupraMol, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 36a, 14195 Berlin, Germany
Corresponding author
Haag, Rainer
Venue
The Journal of Physical Chemistry B
Published
2021-09-10
Volume
125
Issue
37
Pages
10538-10550
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
OpenAlex
W3198327140
Cited by
7
References
69
Citations by year
2026: 2 · 2025: 1 · 2024: 3 · 2022: 1
FWCI
0.40
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Physical Chemistry B (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft (BioSupraMol, BO 1000/11-1, HA 2549/18-1, SFB 1349 (TP C6 (387284271)))
Topics
  • Physical Sciences › Chemistry › Organic Chemistry › Surfactants and Colloidal Systems
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Physical Sciences › Materials Science › Biomaterials › Supramolecular Self-Assembly in Materials
Keywords
carbocyanine dyes, amphiphilic dyes, fluorinated alkyl chains, cylindrical micelles, J-aggregates, H-aggregates, cosolvent effects, methanol, supramolecular aggregation, excitonic coupling, dye self-assembly
MeSH terms
Carbocyanines, Micelles, Spectrometry, Fluorescence, Microscopy, Electron, Transmission, Halogenation

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