Pushing Up the Size Limit of Boron-doped peri-Acenes: Modular Synthesis and Characterizations |
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Authors: | Jin-Jiang Zhang Lin Yang Fupin Liu Gianluca Serra Yubin Fu Andrea Lucotti Alexey A. Popov Matteo Tommasini Ji Ma Xinliang Feng |
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Affiliation: | 1. Max Planck Institute of Microstructure Physics, Weinberg 2, Halle, 06120 Germany;2. Center for Advancing Electronics Dresden (cfaed) & Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Mommsenstrasse 4, 01062 Dresden, Germany;3. Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany;4. Dipartimento di Chimica, Materiali ed Ingegneria Chimica “G. Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy |
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Abstract: | Heteroatom-doped peri-acenes (PAs) have recently attracted considerable attention considering their fascinating physical properties and chemical stability. However, the precise sole addition of boron atoms along the zigzag edges of PAs remains challenging, primarily due to the limited synthetic approach. Herein, we present a novel one-pot modular synthetic strategy toward unprecedented boron-doped PAs (B-PAs), including B-[4,2]PA ( 1 a-2 ), B-[4,3]PA ( 1 b-2 ) and B-[7,2]PA ( 1 c-3 ) derivatives, through efficient intramolecular electrophilic borylation. Their chemical structures are unequivocally confirmed with a combination of mass spectrometry, NMR, and single-crystal X-ray diffraction analysis. Notably, 1 b-2 exhibits an almost planar geometry, whereas 1 a-2 displays a distinctive bowl-like distortion. Furthermore, the optoelectronic properties of this series of B-PAs are thoroughly investigated by UV/Vis absorption and fluorescence spectroscopy combined with DFT calculation. Compared with their parent all-carbon analogs, the obtained B-PAs exhibit high stability, wide energy gaps, and high photoluminescence quantum yields of up to 84 %. This study reveals the exceptional ability of boron doping to finely tune the physicochemical properties of PAs, showcasing their potential applications in optoelectronics. |
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Keywords: | Boron Doping Electrophilic Borylation Peri-Acenes Polycyclic Aromatic Hydrocarbon π-Extension |
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