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Title
Japanese:B,N‐Embedded Helical Nanographenes Showing an Ion‐Triggered Chiroptical Switching Function 
English:B,N‐Embedded Helical Nanographenes Showing an Ion‐Triggered Chiroptical Switching Function 
Author
Japanese: 前田千尋, Sayaka Michishita, Issa Yasutomo, Tadashi Ema.  
English: Chihiro Maeda, Sayaka Michishita, Issa Yasutomo, Tadashi Ema.  
Language English 
Journal/Book name
Japanese:Angewandte Chemie International Edition 
English:Angewandte Chemie International Edition 
Volume, Number, Page        
Published date Jan. 22, 2025 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://dx.doi.org/10.1002/anie.202418546
 
DOI https://doi.org/10.1002/anie.202418546
Abstract <jats:title>Abstract</jats:title><jats:p>Intramolecular oxidative aromatic coupling of 3,6‐bis(<jats:italic>m</jats:italic>‐terphenyl‐2’‐yl)carbazole provided a bis(<jats:italic>m</jats:italic>‐terphenyl)‐fused carbazole, while that of 3,6‐bis(<jats:italic>m</jats:italic>‐terphenyl‐2’‐yl)‐1,8‐diphenylcarbazole afforded a bis(quaterphenyl)‐fused carbazole. Borylation of the latter furnished a B,N‐embedded helical nanographene binding a fluoride anion via a structural change from the three‐coordinate boron to the four‐coordinate boron. The anionic charge derived from the fluoride anion is stabilized over the expanded π‐framework, which leads to the high binding constant (<jats:italic>K</jats:italic><jats:sub>a</jats:sub>) of 1×10<jats:sup>5</jats:sup> M<jats:sup>−1</jats:sup>. The four‐coordinate boron species was converted back to the parent three‐coordinate boron species with Ag<jats:sup>+</jats:sup>, and the chiroptical switch between the three‐coordinate boron and four‐coordinate boron species has been achieved via the ion recognition with the change in the color and <jats:italic>g</jats:italic><jats:sub>lum</jats:sub> values.</jats:p>

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