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Cationic Permethylated Cyclodextrins Capable of Self-Assembling Into Linear Nanostructures in Water
Maxime Kolb1,2, Marvin Benjaffel1,2, Peter Faller2
1Équipe Confinement Moléculaire et Catalyse, Institut de Chimie de Strasbourg, UMR 7177 CNRS, Université de Strasbourg, Strasbourg Cedex, France.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 20, 2026
Summary
Researchers synthesized novel cationic cyclodextrins that self-assemble into unique supramolecular structures in water. These amphiphilic molecules form linear chains or nano-objects, offering new possibilities for materials science.
Area of Science:
- Supramolecular Chemistry
- Organic Synthesis
- Materials Science
Background:
- Cyclodextrins (CDs) are cyclic oligosaccharides with unique host-guest properties.
- Permethylated cyclodextrins offer enhanced solubility and stability.
- Cationic modifications can introduce new functionalities and self-assembly behaviors.
Purpose of the Study:
- To develop a diastereoselective synthesis of cationic permethylated cyclodextrins.
- To investigate the self-assembly behavior of these novel amphiphilic cyclodextrins in water.
- To explore the formation of supramolecular oligomers and nano-objects.
Main Methods:
- Diastereoselective synthesis of cationic permethylated alpha- and beta-cyclodextrins.
- Incorporation of a quaternary ammonium unit bridging adjacent glucose units.
- Characterization of self-assembly into linear head-to-tail supramolecular oligomers and nano-objects based on alkyl chain length.
Main Results:
- Successful synthesis of cationic permethylated alpha- and beta-cyclodextrins with an outward-facing alkyl chain.
- Formation of linear supramolecular oligomers (DP up to five CD units) with C8 and C12 alkyl chains.
- Generation of larger nano-objects with a C16 alkyl chain.
- Preparation of beta-CD analogs with adamantyl-terminated chains forming similar oligomeric material.
- Prevention of self-inclusion and head-to-head dimerization due to fixed stereochemistry and blocked CD opening.
Conclusions:
- A novel synthetic route to amphiphilic cationic cyclodextrins has been established.
- These molecules exhibit controlled self-assembly in water, forming defined supramolecular architectures.
- The structural features prevent undesirable self-aggregation, leading to stable oligomers and nano-objects.
