Quinoidal Azaacenes: 99 % Diradical Character
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Date
2020
Volume
59
Issue
30
Journal
Angewandte Chemie - International Edition
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Publisher
Weinheim : Wiley-VCH Verlag
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Abstract
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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Citation
Intorp, S. N., Hodecker, M., Müller, M., Tverskoy, O., Rosenkranz, M., Dmitrieva, E., et al. (2020). Quinoidal Azaacenes: 99 % Diradical Character (Weinheim : Wiley-VCH Verlag). Weinheim : Wiley-VCH Verlag. https://doi.org//10.1002/anie.201915977
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CC BY 4.0 Unported