ArticleAngewandte Chemie (International ed. in English)2021
Polymorphism in Squaraine Dye Aggregates by Self-Assembly Pathway Differentiation: Panchromatic Tubular Dye Nanorods versus J-Aggregate Nanosheets.
Article in Angewandte Chemie (International ed. in English), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.
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Who cites it
19 citing papers in PubMed, 111 citations in OpenAlex.
- Thermally Controlled Chiral Supramolecular Polymorphism in Water.Angewandte Chemie (International ed. in English) · 2026Article
- One- and Two-Dimensional Polymorphism in a Hydrogen-Bonding Bis-Ureido-Squaramide.Angewandte Chemie (International ed. in English) · 2026Article
- Synthesis, Structure, and Thin Film Optical Properties of a Chiral Benzothiazole-Derived Squaraine.Chemphyschem : a European journal of chemical physics and physical chemistry · 2026Article
- How to Characterize Supramolecular Polymers: A User Guide.ACS polymers Au · 2026Article
- Squaraine Nanodunes: Structure-Correlated Optical and Vibrational Anisotropy and Morphology-Enhanced Local Field Considerations.ACS photonics · 2025Article
- Complex Donuts: Small Variations in DNA Sequence Dictate Pathway Complexity in DNA Nanotoroids.Angewandte Chemie (International ed. in English) · 2025Article
- Electrostatic Co-Assembly of Cyanine Pair for Augmented Photoacoustic Imaging and Photothermal Therapy.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025Article
- Supramolecular Engineering of Narrow Absorption Bands by Exciton Coupling in Pristine and Mixed Solid-State Dye Aggregates.ACS central science · 2025Article
- Chirality Evolution of Supramolecular Helices by Electron Transfer Assisted Secondary Nucleation.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025Article
- Modulating self-assembly and polymorph transitions in bisdendronized squaramides.Communications chemistry · 2024Article
- Rational design of CT-coupled J-aggregation platform based on Aza-BODIPY for highly efficient phototherapy.Chemical science · 2024Article
- Aggregates of Cyanine Dyes: When Molecular Vibrations and Electrostatic Screening Make the Difference.The journal of physical chemistry. C, Nanomaterials and interfaces · 2023Article
- Rational design and topochemical synthesis of polymorphs of a polymer.Chemical science · 2023Article
- Intramolecular Charge Transfer and Ultrafast Nonradiative Decay in DNA-Tethered Asymmetric Nitro- and Dimethylamino-Substituted Squaraines.The journal of physical chemistry. A · 2023Article
- Thermoreversible Polymorph Transitions in Supramolecular Polymers of Hydrogen-Bonded Squaramides.Angewandte Chemie (International ed. in English) · 2022Article
- Synthesis and Characterization of Newly Designed and Highly Solvatochromic Double Squaraine Dye for Sensitive and Selective Recognition towards CuMolecules (Basel, Switzerland) · 2022Article
- Template and Temperature-Controlled Polymorph Formation in Squaraine Thin Films.Langmuir : the ACS journal of surfaces and colloids · 2022Article
- Photo-modulation of supramolecular polymorphism in the self-assembly of a scissor-shaped azobenzene dyad into nanotoroids and fibers.Chemical science · 2022Article
- Polymorphism in Squaraine Dye Aggregates by Self-Assembly Pathway Differentiation: Panchromatic Tubular Dye Nanorods versus J-Aggregate Nanosheets.Angewandte Chemie (International ed. in English) · 2021Article
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Authors and funding
6 authors at 3 institutions in 2 countries.
Funding
Abstract
A bis(squaraine) dye equipped with alkyl and oligoethyleneglycol chains was synthesized by connecting two dicyanomethylene substituted squaraine dyes with a phenylene spacer unit. The aggregation behavior of this bis(squaraine) was investigated in non-polar toluene/tetrachloroethane (98:2) solvent mixture, which revealed competing cooperative self-assembly pathways into two supramolecular polymorphs with entirely different packing structures and UV/Vis/NIR absorption properties. The self-assembly pathway can be controlled by the cooling rate from a heated solution of the monomers. For both polymorphs, quasi-equilibrium conditions between monomers and the respective aggregates can be established to derive thermodynamic parameters and insights into the self-assembly mechanisms. AFM measurements revealed a nanosheet structure with a height of 2 nm for the thermodynamically more stable polymorph and a tubular nanorod structure with a helical pitch of 13 nm and a diameter of 5 nm for the kinetically favored polymorph. Together with wide angle X-ray scattering measurements, packing models were derived: the thermodynamic polymorph consists of brick-work type nanosheets that exhibit red-shifted absorption bands as typical for J-aggregates, while the nanorod polymorph consists of eight supramolecular polymer strands of the bis(squaraine) intertwined to form a chimney-type tubular structure. The absorption of this aggregate covers a large spectral range from 550 to 875 nm, which cannot be rationalized by the conventional exciton theory. By applying the Essential States Model and considering intermolecular charge transfer, the aggregate spectrum was adequately reproduced, revealing that the broad absorption spectrum is due to pronounced donor-acceptor overlap within the bis(squaraine) nanorods. The latter is also responsible for the pronounced bathochromic shift observed for the nanosheet structure as a result of the slip-stacked arranged squaraine chromophores.
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