期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 49, 页码 17745-17750出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201909126
关键词
azafullerenes; [10]cycloparaphenylene; host-guest complexes; long-lived radicals; photoinduced radical generation
资金
- Region Pays de la Loire Paris Scientifiques [09375]
- CCIPL
- European Union [642742]
- National Infrastructure in Nanotechnology, Advanced Materials and Micro-/Nanoelectronics - Operational Program Competitiveness, Entrepreneurship and Innovation (NSRF) [MIS 5002772]
- Ministry of Development and Investments
- European Union (European Regional Development Fund)
- Slovenian Research Agency [P1-0125, N1-0052]
- COST Action - COST Association (European Cooperation in Science and Technology) [CA15107]
A major handicap towards the exploitation of radicals is their inherent instability. In the paramagnetic azafullerenyl radical C59N., the unpaired electron is strongly localized next to the nitrogen atom, which induces dimerization to diamagnetic bis(azafullerene), (C59N)(2). Conventional stabilization by introducing steric hindrance around the radical is inapplicable here because of the concave fullerene geometry. Instead, we developed an innovative radical shielding approach based on supramolecular complexation, exploiting the protection offered by a [10]cycloparaphenylene ([10]CPP) nanobelt encircling the C59N. radical. Photoinduced radical generation is increased by a factor of 300. The EPR signal showing characteristic N-14 hyperfine splitting of C59N.subset of [10]CPP was traced even after several weeks, which corresponds to a lifetime increase of >10(8). The proposed approach can be generalized by tuning the diameter of the employed nanobelts, opening new avenues for the design and exploitation of radical fullerenes.
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