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Title: Quinoidal Azaacenes: 99 % Diradical Character
Authors: Intorp, S.N.Hodecker, M.Müller, M.Tverskoy, O.Rosenkranz, M.Dmitrieva, E.Popov, A.A.Rominger, F.Freudenberg, J.Dreuw, A.Bunz, U.H.F.
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Issue Date: 2020
Published in: Angewandte Chemie - International Edition Vol. 59 (2020), No. 30
Publisher: Weinheim : Wiley-VCH Verlag
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.
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
DDC: 540
License: CC BY 4.0 Unported
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Appears in Collections:Chemie

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