Quinoidal Azaacenes: 99 % Diradical Character
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Date
2020
Volume
59
Issue
30
Journal
Series Titel
Book Title
Publisher
Weinheim : Wiley-VCH Verlag
Link to publishers version
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.
Description
Keywords
acenes, heteroaromatics, radicals, structure elucidation, synthetic methods, Nuclear magnetic resonance spectroscopy, Diradicals, Half lives, Paramagnetic behavior, SQUID measurements, Triplet state, Electron spin resonance spectroscopy
Citation
Intorp, S. N., Hodecker, M., Müller, M., Tverskoy, O., Rosenkranz, M., Dmitrieva, E., et al. (2020). Quinoidal Azaacenes: 99 % Diradical Character. 59(30). https://doi.org//10.1002/anie.201915977
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License
CC BY 4.0 Unported