Controllable chiral inversion via thioether bond-activated J- and H-aggregation transformation

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Materials Science

Background:

• Chiral dendrimers are complex macromolecules with unique properties.
• Controlling aggregation states (J- and H-aggregation) in π-systems is crucial for optical applications.
• Chiral inversion and its transfer in self-assembled systems remain challenging.

Purpose of the Study:

• To describe thioether bonds in chiral dendrimers for activating aggregation transformations.
• To achieve controllable chiral inversion within π-systems.
• To investigate the memorization and transfer of inverted chirality during self-assembly.

Main Methods:

• Synthesis of chiral dendrimers featuring peripheral thioether bonds.
• Spectroscopic analysis to monitor J- and H-aggregation.
• Chiral analysis to track chiral inversion and transfer.
• Self-assembly studies to form nano-helical structures.

Main Results:

• Thioether bonds successfully activated the transformation between J- and H-aggregation.
• Controllable chiral inversion was achieved in the π-systems.
• The close-knit per-aggregation of dendrimers facilitated chiral inversion memorization.
• Inverted chirality was effectively transferred from oligomers to nano-helices during self-assembly.

Conclusions:

• Peripheral thioether bonds are effective in controlling aggregation states and chiral inversion in dendrimers.
• Dendrimer architecture plays a key role in memorizing and transferring chirality during self-assembly.
• This work offers a novel strategy for designing chiral nanomaterials with tunable optical properties.