Structure of J-Aggregates of Pseudoisocyanine Dye in Aqueous Solution
Abstract
Cryo-transmission electron microscopy (cryo-TEM), absorption spectroscopy with polarized light, and polarized-light optical microscopy have been used to characterize the J-aggregates formed by the dye 1,1‘-diethyl-2,2‘-cyanine chloride (pseudoisocyanine chloride) in aqueous solution. Cryo-TEM visualizes for the first time directly the rodlike morphology of the J-aggregates. A rod diameter of 2.3 ± 0.2 nm is estimated. Absorption spectroscopy shows that J-aggregation is a strong function of dye concentration and starts in dilute solution before the viscosity increases and mesophases appear. For a 12.5 × 10 -3 mol solution, the length of the J-aggregates is on the order of 350 nm, which corresponds to aggregation numbers of ≈3000. Optical microscope textures reveal columnar nematic and hexagonal phases at higher dye concentrations. Structural alternatives for the molecular packing within the J-aggregate based on the estimated rod geometry are discussed. A quasi-two-dimensional superstructure is proposed which could better explain the optical properties of the J-aggregates than previous models.
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Currently reported J-aggregates formed in an aqueous environment, in particular polymethine-based J-aggregates, generally showed relatively low Φfl.
“It is important to stress that the currently reported J-aggregates formed in an aqueous environment, in particular, polymethine-based J-aggregates, generally showed relatively low Φfl.121−124”
From The Pursuit of Shortwave Infrared-Emitting Nanoparticles with Bright Fluorescence through Molecular Design and Excited-State Engineering of Molecular Aggregates (2022) · cites this paper as [121]
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- Authors
- von Berlepsch, H., Böttcher, C., & Dähne, L.
- Affiliations
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, D-14424 Potsdam, Germany, and Forschungszentrum für Elektronenmikroskopie, Freie Universität Berlin, Fabeckstraβe 36a, D-14195 Berlin, Germany
- Max Planck Institute of Colloids and Interfaces (DE)
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-08-24
- Volume
- 104
- Issue
- 37
- Pages
- 8792-8799
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2036734876
- Cited by
- 181
- References
- 37
- Citations by year
- 2026: 3 · 2025: 1 · 2024: 4 · 2023: 2 · 2022: 5 · 2021: 13 · 2020: 9 · 2019: 7 · 2018: 10 · 2017: 5 · 2016: 2 · 2015: 6 · 2014: 8 · 2013: 5 · 2012: 9
- FWCI
- 6.56
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Physical Chemistry B (publishedVersion)
- Max Planck Institute for Plasma Physics (submittedVersion)
- Max Planck Digital Library (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- Topics
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
- Physical Sciences › Materials Science › Biomaterials › Supramolecular Self-Assembly in Materials
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Spectroscopy and Quantum Chemical Studies
- Keywords
- J-aggregates, cyanine dyes, aggregation number, dye concentration dependence, nematic phase, hexagonal phase, molecular packing
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