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Preparation and Characterization of C60/Graphene Hybrid Nanostructures
Published on: May 15, 2018
Nesting complexation of C60 with large, rigid D2 symmetrical macrocycles
Marco Caricato1, Carmine Coluccini, Daniele Dondi
1Department of Organic Chemistry, University of Pavia, Viale Taramelli, 10, 27100, Pavia, Italy.
Organic & Biomolecular Chemistry
|June 5, 2010
Summary
Chiral macrocycles with specific organic bridges selectively bind to C(60) fullerenes. Modifications in bridge length and linkage type significantly impact complex stability and binding affinity.
Area of Science:
- Organic Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Chiral macrocycles are crucial in host-guest chemistry.
- Designing macrocycles for selective guest binding remains a challenge.
- Fullerenes, like C(60), are important molecular targets.
Purpose of the Study:
- To synthesize and characterize novel chiral D(2) symmetrical macrocycles.
- To investigate the influence of bridge structure on macrocycle conformation.
- To evaluate the binding affinity of these macrocycles towards C(60) fullerenes.
Main Methods:
- Synthesis and characterization of four chiral macrocycles with varying conjugated organic spacers.
- Analysis using Nuclear Magnetic Resonance (NMR) and Circular Dichroism (CD) spectroscopy.
- Molecular modeling to understand conformational changes.
- Binding studies with C(60) using equilibrium-restricted factor analysis.
Main Results:
- Three out of four synthesized macrocycles formed stable 1:1 complexes with C(60) in toluene.
- Macrocycles with longer bridging units and/or ester linkages showed higher binding affinity.
- Conformational changes were observed with subtle modifications in the bridging units.
- Binding constants (log K(a)) ranged from 3.498(4) to 4.37(2).
Conclusions:
- The length and electronic properties of organic bridges significantly influence macrocycle conformation and C(60) binding.
- Ester linkages and longer conjugated spacers enhance the stability of C(60) inclusion complexes.
- These findings provide insights into the rational design of chiral macrocyclic hosts for fullerene recognition.
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