Home >

news Help

Publication Information


Title
Japanese: 
English:Conformationally Driven Dual Fluorescence Properties of Higher Heteroacenes With Periodically Incorporated Boron Atoms 
Author
Japanese: Takeshi Yokochi, 横山 寛義, 塚田 哲義, Hayato Sakai, 羽曾部 卓, 福島 孝典, 庄子 良晃.  
English: Takeshi Yokochi, Hiromichi Yokoyama, Tetsuyoshi Tsukada, Hayato Sakai, Taku Hasobe, Takanori Fukushima, Yoshiaki Shoji.  
Language English 
Journal/Book name
Japanese: 
English:Angewandte Chemie International Edition 
Volume, Number, Page Volume 65    Issue 17    e3365679
Published date Mar. 10, 2026 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://doi.org/10.1002/anie.3365679
 
DOI https://doi.org/10.1021/acsami.5c19530
Abstract Hexaboraheptacene (B6-hept), featuring a periodic arrangement of boron atoms, together with its shorter homologues tetraborapentacene (B4-pent) and diboraanthracene (B2-ant), were synthesized via cyclocondensation of o-bis(dihydroboryl)arenes. The reactive boron centers are effectively protected by 2,4,6-triisopropylphenyl (Tip) groups, enabling handling under ambient conditions. As the number of boron bridges increases, the electron-accepting ability as well as the multistep reversible redox properties are progressively enhanced. B6-hept exhibits pronounced dual fluorescence in solution, in which relative intensities depend on the excitation wavelength and solvent viscosity. DFT calculations suggest that this phenomenon originates from two interconvertible conformers, namely, the bent-zigzag and twisted forms, which result from a delicate balance between the extended π-system and the steric demands of the Tip groups. This interpretation is supported by the fact that B4-pent displays only weak dual emission, while B2-ant shows none. This study not only introduces a new class of heteroacenes with potential applications in optoelectronics and electrocatalysis, but also provides insight into steric-design strategies for tuning the conformational landscapes of boron-containing π-systems.

©2007 Institute of Science Tokyo All rights reserved.