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Liquid-Crystalline Tris[60]fullerodendrimers
Pauline Pieper1, Virginie Russo1, Benoît Heinrich2
1Institut de Chimie , Université de Neuchâtel , Avenue de Bellevaux 51 , 2000 Neuchâtel , Switzerland.
The Journal of Organic Chemistry
|March 2, 2018
Summary
Novel liquid-crystalline fullerodendrimers were synthesized using olefin cross-metathesis. These materials exhibit unique lamellar mesophases, demonstrating adaptive properties influenced by their dendritic structure and fullerene content.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Organic Synthesis
Background:
- Dendrimers offer tunable properties for advanced materials.
- Fullerene derivatives are explored for unique electronic and structural characteristics.
- Liquid crystals possess ordered phases with applications in displays and sensors.
Purpose of the Study:
- To synthesize novel liquid-crystalline tris[60]fullerodendrimers.
- To investigate the structure-property relationships of these new materials.
- To explore the impact of dendritic architecture and fullerene incorporation on mesophase behavior.
Main Methods:
- Synthesis via olefin cross-metathesis using Grubbs or Hoveyda-Grubbs catalysts.
- Characterization using polarized optical microscopy, differential scanning calorimetry, and small-angle X-ray scattering.
- Preparation of fullerene-free, mono[60]fullerodendrimer, and bis[60]fullerodendrimer derivatives.
Main Results:
- Successful synthesis of liquid-crystalline poly(arylester)dendrons with cyanobiphenyl mesogens and [60]fullerene units.
- Observation of lamellar mesophases (smectic C and/or smectic A) due to segregation of components.
- Materials displayed liquid-crystalline properties across a range of compositions.
Conclusions:
- The synthesized fullerodendrimers exhibit tunable liquid-crystalline behavior.
- Mesomorphism is primarily governed by the dendrimer structure, with adaptive mechanisms regulating phase arrangements.
- The study provides a modular approach for creating complex fullerene-based dendritic materials.
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