Azahelicene-fused Blatter radicals: chiral paramagnetic NIR absorbers

Hemant K. Singh; Vidhika Punjani; Jiří Rybáček; Anna Pietrzak; Lucie Bednárová; Piotr Kaszyński

doi:10.1039/D5CC07389H

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Azahelicene-fused Blatter radicals: chiral paramagnetic NIR absorbers

Hemant K. Singh,

†^a Vidhika Punjani,

†^a Jiří Rybáček,

^b Anna Pietrzak,

^c Lucie Bednárová

^b and Piotr Kaszyński

*^ad

Author affiliations

* Corresponding authors

^a Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Łódź, Poland
E-mail: piotr.kaszynski@cbmm.lodz.pl

^b Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, Prague 6, Czech Republic

^c Faculty of Chemistry, Łódź University of Technology, Łódź, Poland

^d Faculty of Chemistry, University of Łódź, Tamka 12, Łódź, Poland

Abstract

Two stable benzo[e][1,2,4]triazinyl radicals fused with a fluorescent carbazole-based helicene were obtained by photocyclization and investigated by spectroscopic, electrochemical and DFT methods. The racemates were resolved and ECD spectra were analyzed.

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DOI: https://doi.org/10.1039/D5CC07389H
Article type: Communication
Submitted: 29 Dec 2025
Accepted: 08 Feb 2026
First published: 09 Feb 2026

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Chem. Commun., 2026, Advance Article

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Azahelicene-fused Blatter radicals: chiral paramagnetic NIR absorbers

H. K. Singh, V. Punjani, J. Rybáček, A. Pietrzak, L. Bednárová and P. Kaszyński, Chem. Commun., 2026, Advance Article , DOI: 10.1039/D5CC07389H

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Azahelicene-fused Blatter radicals: chiral paramagnetic NIR absorbers

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Azahelicene-fused Blatter radicals: chiral paramagnetic NIR absorbers

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