Acid-base controlled multiple conformation and aromaticity switches in tren-capped hexaphyrins

Abstract : Upon protonation, a tren-capped hexaphyrin undergoes successive rectangular-to-Möbius and Möbius-to-triangular conformational isomerizations, with concomitant antiaromaticity-to-aromaticity reversal. This affords different cage environments leading ultimately to a "crypto-bowl-shape" hexaphyrin hosting a trifluoroacetate counterion.
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Stéphane Le Gac, Elsa Caytan, Vincent Dorcet, Bernard Boitrel. Acid-base controlled multiple conformation and aromaticity switches in tren-capped hexaphyrins. Organic and Biomolecular Chemistry, Royal Society of Chemistry, 2019, 17 (15), pp.3718-3722. ⟨10.1039/c9ob00489k⟩. ⟨hal-02087814⟩

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