Modular Synthesis of Organoboron Helically Chiral Compounds: Cutouts from Extended Helices

Please always quote using this URN: urn:nbn:de:bvb:20-opus-225775
  • Two types of helically chiral compounds bearing one and two boron atoms were synthesized by a modular approach. Formation of the helical scaffolds was executed by the introduction of boron to flexible biaryl and triaryl derived from small achiral building blocks. All‐ortho‐fused azabora[7]helicenes feature exceptional configurational stability, blue or green fluorescence with quantum yields (Φ\(_{fl}\)) of 18–24 % in solution, green or yellow solid‐state emission (Φ\(_{fl}\) up to 23 %), and strong chiroptical response with large dissymmetryTwo types of helically chiral compounds bearing one and two boron atoms were synthesized by a modular approach. Formation of the helical scaffolds was executed by the introduction of boron to flexible biaryl and triaryl derived from small achiral building blocks. All‐ortho‐fused azabora[7]helicenes feature exceptional configurational stability, blue or green fluorescence with quantum yields (Φ\(_{fl}\)) of 18–24 % in solution, green or yellow solid‐state emission (Φ\(_{fl}\) up to 23 %), and strong chiroptical response with large dissymmetry factors of up to 1.12×10\(^{-2}\). Azabora[9]helicenes consisting of angularly and linearly fused rings are blue emitters exhibiting Φ\(_{fl}\) of up to 47 % in CH\(_{2}\)Cl\(_{2}\) and 25 % in the solid state. As revealed by the DFT calculations, their P–M interconversion pathway is more complex than that of H1. Single‐crystal X‐ray analysis shows clear differences in the packing arrangement of methyl and phenyl derivatives. These molecules are proposed as primary structures of extended helices.show moreshow less

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Metadaten
Author: Julian Full, Santosh P. Panchal, Julian Götz, Ana‐Maria Krause, Agnieszka Nowak‐Król
URN:urn:nbn:de:bvb:20-opus-225775
Document Type:Journal article
Faculties:Fakultät für Chemie und Pharmazie / Institut für Anorganische Chemie
Language:English
Parent Title (English):Angewandte Chemie International Edition
Year of Completion:2021
Volume:60
Issue:8
First Page:4350
Last Page:4357
Source:Angewandte Chemie International Edition 2021, 60(8):4350–4357. DOI: 10.1002/anie.202014138
DOI:https://doi.org/10.1002/anie.202014138
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Tag:chirality; circular dichroism; fluorescence; helicene; organoboron
Release Date:2021/10/15
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International