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Updated: Jun 1, 2026
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
Multifunctional, polymorphic, ionic fullerene supramolecular materials: self-assembly and thermotropic properties.
Hongguang Li1, Martin J Hollamby, Tomohiro Seki
1Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany.
Langmuir : the ACS Journal of Surfaces and Colloids
|May 24, 2011
Summary
Ionic fullerene derivatives exhibit unique self-assembly properties and liquid crystallinity. Adding ionicity to N-methylfulleropyrrolidine influences electronic structure, electrochemical behavior, and the formation of diverse nanostructures.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Nanotechnology
Background:
- Fullerene derivatives are versatile building blocks for advanced materials.
- Understanding the impact of ionicity on fullerene properties is crucial for designing functional materials.
Purpose of the Study:
- To synthesize and characterize an ionic fullerene derivative, N,N-dimethylfulleropyrrolidinium iodide (1).
- To investigate the spectroscopic, electrochemical, self-assembly, and liquid crystalline properties of the ionic fullerene (1) and compare them to its neutral precursor (2).
- To elucidate the effects of ionicity on fullerene self-assembly and functionality.
Main Methods:
- Synthesis of N,N-dimethylfulleropyrrolidinium iodide (1) from N-methylfulleropyrrolidine (2).
- Spectroscopic analysis (UV-Vis) to observe changes in electronic structure.
- Electrochemical measurements (cyclic voltammetry) in solution and film states.
- Self-assembly studies in solution and on substrates.
- Thermotropic behavior analysis using differential scanning calorimetry and polarized optical microscopy.
Main Results:
- Ionization of fullerene derivative 2 to form ionic compound 1 resulted in observable changes in UV spectra and a positive shift in electrochemical reduction potentials.
- Ionic fullerene 1 self-assembled into diverse structures including water-repellent microparticles, doughnut-shaped objects, and C(60) nanowires (>1 μm) driven by π-π, van der Waals, and electrostatic interactions.
- A smectic liquid crystalline phase was observed for compound 1 at elevated temperatures, alongside a gradual deionization back-reaction to the neutral precursor 2.
Conclusions:
- The introduction of ionicity significantly alters the electronic and electrochemical properties of alkylated fullerene derivatives.
- Ionic fullerene derivatives can form complex, hierarchical self-assembled structures with tunable morphologies and functionalities.
- The observed liquid crystalline behavior and deionization reaction provide valuable insights into the stability and application potential of ionic fullerenes.
