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. 2023 Mar 20;62(13):e202217234.
doi: 10.1002/anie.202217234. Epub 2023 Feb 20.

Visible Helicity Induction and Memory in Polyallene toward Circularly Polarized Luminescence, Helicity Discrimination, and Enantiomer Separation

Lei Xu  1   2 , Yong-Jie Wu  3 , Run-Tan Gao  1 , Shi-Yi Li  1 , Na Liu  4 , Zong-Quan Wu  1
Affiliations

Visible Helicity Induction and Memory in Polyallene toward Circularly Polarized Luminescence, Helicity Discrimination, and Enantiomer Separation

Lei Xu et al. Angew Chem Int Ed Engl. .

Abstract

Inspired by biological helices (e.g., DNA), artificial helical polymers have attracted intense attention. However, precise synthesis of one-handed helices from achiral materials remains a formidable challenge. Herein, a series of achiral poly(biphenyl allene)s with controlled molar mass and low dispersity were prepared and induced into one-handed helices using chiral amines and alcohols. The induced one-handed helix was simultaneously memorized, even after the chiral inducer was removed. The switchable induction processes were visible to naked eye; the achiral polymers exhibited blue emission (irradiated at 365 nm), whereas the induced one-handed helices exhibited cyan emission with clear circularly polarized luminescence. The induced helices formed stable gels in various solvents with helicity discrimination ability: the same-handed helix gels were self-healing, whereas the gels of opposite-handed helicity were self-sorted. Moreover, the induced helices could separate enantiomers via enantioselective crystallization with high efficiency and switchable enantioselectivity.

Keywords: Chirality; Circularly Polarized Luminescence; Enantiomer Separation; Helix; Self-Discrimination.

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