Quinoidal azaacenes: 99 % diradical character
Quinoidal azaacenes with almost pure diradical character (y=0.95 to y=0.99) were synthesized. All compounds exhibit paramagnetic behavior investigated by EPR and NMR spectroscopy, and SQUID measurements, revealing thermally populated triplet states with an extremely low-energy gap ΔEST′ of 0.58 to 1...
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| Hauptverfasser: | , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
19 March 2020
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| In: |
Angewandte Chemie
Year: 2020, Jahrgang: 59, Heft: 30, Pages: 12496-12501 |
| ISSN: | 1521-3757 |
| DOI: | 10.1002/ange.201915977 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1002/ange.201915977 Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/ange.201915977 
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| Verfasserangaben: | Sebastian N. Intorp, Manuel Hodecker, Matthias Müller, Olena Tverskoy, Marco Rosenkranz, Evgenia Dmitrieva, Alexey A. Popov, Frank Rominger, Jan Freudenberg, Andreas Dreuw, and Uwe H.F. Bunz |
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| 520 | |a Quinoidal azaacenes with almost pure diradical character (y=0.95 to y=0.99) were synthesized. All compounds exhibit paramagnetic behavior investigated by EPR and NMR spectroscopy, and SQUID measurements, revealing thermally populated triplet states with an extremely low-energy gap ΔEST′ of 0.58 to 1.0 kcal mol−1. The species are persistent in solution (half-life≈14-21 h) and in the solid state they are stable for weeks. | ||
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