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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Selective C70 Recognition by a Rigid Porphyrin-Carbazole Cavitand
Mohini Mittal1, Sameeksha Agrawal1, Pradip Kumar Mondal2
1Department of Chemistry, Indian Institute of Science Education and Research Bhopal (IISER Bhopal), Bhopal, India.
Two novel porphyrin dimers show strong binding affinity for C70 fullerenes. These molecular receptors selectively bind larger fullerenes through van der Waals forces and structural flexibility, aiding in fullerene separation.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Organic Chemistry
Background:
- Fullerene separation is crucial for advanced applications.
- Developing selective molecular receptors is key for efficient fullerene separation.
- Porphyrin-based receptors offer potential for specific guest binding.
Purpose of the Study:
- To design and synthesize novel co-facial porphyrin dimers.
- To investigate the binding affinities and selectivity of these dimers towards fullerenes, particularly C70.
- To elucidate the binding mechanism between the porphyrin receptors and fullerenes.
Main Methods:
- Synthesis of two new co-facial porphyrin dimers.
- Spectroscopic studies (e.g., UV-Vis, NMR) to analyze binding.
- Binding affinity and selectivity measurements in the presence of C60 and C70.
Main Results:
- Both receptor conformations exhibited strong affinities for C70.
- Selective binding towards the larger fullerene (C70) was observed, even with excess C60.
- Binding mechanism is dominated by van der Waals interactions and host flexibility, not cavity size.
Conclusions:
- The developed porphyrin dimers are effective molecular receptors for C70.
- The findings highlight the importance of noncovalent interactions and host flexibility in fullerene recognition.
- This work contributes to the advancement of selective fullerene separation techniques.
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