@article{be7992baad3643a0a6f0d64a788f1b04,
title = "Synthesis and Chiroptical Properties of Quinoxaline-Fused Polyaza[5]–[7]helicenes with Orange-Color CPL Emissions",
abstract = "We achieved a two-type synthesis of quinoxaline-fused polyaza[5]- and [7]helicenes through consecutive N−H/C−H coupling with a hypervalent iodine reagent as a key reaction. By fusing electron-deficient quinoxaline, these polyazahelicenes constitute an efficient donor-acceptor type of molecule with absorption edges that reach up to approximately 650 nm. Evaluating the chiroptical properties reveals that the polyazahelicene exhibits a rare orange circularly polarized glow with a luminescence dissymmetry factor (glum value) of 0.003.",
keywords = "N−H/C−H coupling, circularly polarized luminescence, electron-deficient compounds, helicenes, hypervalent compounds, quinoxalines",
author = "Takashi Otani and Takuma Sasayama and Masashi Horiuchi and Shunnosuke Okauchi and Hidetoshi Kawai and Maho Kitahara and Yoshitane Imai and Takanori Shibata",
note = "Funding Information: This work was supported by JSPS KAKENHI Grant Number 16 K05710 and Waseda University Grant for Special Research projects (2020 N‐007). We acknowledge . for a generous gift of HFIP. Central Glass Co., Ltd Funding Information: This work was supported by JSPS KAKENHI Grant Number 16 K05710 and Waseda University Grant for Special Research projects (2020 N-007). We acknowledge Central Glass Co., Ltd. for a generous gift of HFIP. Publisher Copyright: {\textcopyright} 2021 Wiley-VHCA AG, Zurich, Switzerland",
year = "2021",
month = apr,
doi = "10.1002/hlca.202100016",
language = "English",
volume = "104",
journal = "Helvetica Chimica Acta",
issn = "0018-019X",
publisher = "Verlag Helvetica Chimica Acta AG",
number = "4",
}