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Title
Japanese: 
English:π-Conjugation Engineering of Isoindolinone-Based Aryl Amides Enables Highly Efficient Fluorescence via Control of Nonradiative Pathways 
Author
Japanese: 猿渡 悠生, 田中 拓哉, 東屋 功, 森 俊文, 小西玄一.  
English: Yuki Sawatari, Takuya Tanaka, Isao Azumaya, Toshifumi Mori, Gen-ichi Konishi.  
Language English 
Journal/Book name
Japanese: 
English:Chemistry Letters 
Volume, Number, Page Vol. 55    No. 6    p. upag123
Published date June 5, 2026 
Publisher
Japanese: 
English:The Chemical Society of Japan 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://doi.org/10.1093/chemle/upag123
 
DOI https://doi.org/10.1093/chemle/upag123
Abstract π-Conjugation extension in N-aryl isoindolinones enables rational control of excited-state pathways and fluorescence efficiency. Stepwise π-extension enhances fluorescence quantum yield from 0.04 to 0.58 while maintaining large Stokes shifts. Photophysical measurements and theoretical calculations suggest that the enhanced fluorescence efficiency is associated with modulation of excited-state pathways, including reduced ISC probability and TICT-like structural relaxation. These findings indicate that the isoindolinone framework provides a versatile platform for designing highly emissive chromophores through precise control of excited-state dynamics.

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