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Coronenohelicenes with Dynamic Chirality

Weiss, Corinna; Sharapa, Dmitry I.; Hirsch, Andreas

Abstract:
The synthesis of a new type of chiral and dynamic nonplanar aromatics containing a combination of fused perylene‐based coronenes and helicenes is reported. Either one or two helicene moieties were fused to the bay regions of an extended perylene core. The target compounds contain either identical or two different helicene building blocks. The combination with two helicene units leads to six different isomers, including two pairs of enantiomers and two meso forms. The experimental determination of the isomerization barriers the corresponding double [5]‐helicenes revealed activation energies of E$_{a}$=24.81 and 25.38 kcal mol$^{-1}$, which is slightly above the barrier of the parent [5]‐helicene. Resolution of all possible regio‐ and stereoisomers allowed for the systematic investigation of the chiroptical properties. They revealed remarkable dissymmetry factors Ig$_{abs}$I of up to 1.2×10$^{-2}$, which mirror the synergy between the strong absorbing perylenes and the inherent chirality of helicenes.

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Verlagsausgabe §
DOI: 10.5445/IR/1000125752
Veröffentlicht am 05.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0947-6539, 1521-3765
KITopen-ID: 1000125752
Erschienen in Chemistry - a European journal
Seiten chem.202001703
Vorab online veröffentlicht am 24.09.2020
Nachgewiesen in Scopus
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