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Eine Frage von Spin und Topologie Ein Methano[10]annulen‐basiertes Tetracyanochinodimethan hat eine bemerkenswert kleine Singulett‐Triplett‐Energielücke als Ergebnis eines antiaromatischen (aber Möbius‐artigen) elektronischen Singulett‐Grundzustands und eines aromatischen Hückel‐artigen angeregten Triplett‐Zustands. In der Zuschrift auf S. 5986 ff. erklären J. Casado, J. D. Tovar et al., wie die kleine...
Within the continuum of π‐extended quinoidal electronic structures exist molecules that by design can support open‐shell diradical structures. The prevailing molecular design criteria for such structures involve proaromatic nature that evolves aromaticity in open‐shell diradical resonance structures. A new diradical species built upon a quinoidal methano[10]annulene unit is synthesized and spectroscopically...
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