2025 - Sustainable Industrial Processing Summit
SIPS2025 Volume 4. Matyjaszewski Intl. Symp. / Polymers
| Editors: | F. Kongoli, R.C. Advincula, B.Z. Tang, S. Thomas |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2025 |
| Pages: | 208 pages |
| ISBN: | 978-1-998384-44-0 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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CONTROLLABLE HELIX INVERSION AND CIRCULARLY-POLARIZED LUMINESCENCE OF POLYMERIC FOLDAMERS
Zijie Qiu1;1THE CHINESE UNIVERSITY OF HONG KONG, Shenzhen, China;
Type of Paper: Regular
Id Paper: 110
Topic: 62
Abstract:
Biomacromolecules such as DNA, proteins, and polysaccharides possess unique helical structures, which are closely related to various biological activities involving recognition, catalysis, replication, genetic information storage, etc.[1-3] To date, many artificial foldamers have been designed because they can act as the ideal systems to simulate the structures and functions of biomacromolecules.[4] Herein, we have synthesized a water-soluble poly(m-phenylene ethynylene)-based foldamer bearing L-alanine sodium pendants, whose solvent-driven helix inversion can be visualized with the aid of a tetraphenylethene-functionalized hemicyanine dye based on the restriction of intramolecular motions (RIM) and intramolecular charge transfer (ICT) mechanisms. In addition, another foldamer bearing L-alanine hexyl ester pendants is synthesized, showing a weak circularly polarized luminescence (CPL) signal in solution, but has a significant blue-colored negative CPL signal with a dissymmetry factor (glum) of -0.01 in film. A benzothiadiazole dye-based achiral fluorescent film is prepared. Then, the two films are arranged side by side. When the foldamer film is close to the excitation light, a yellow-colored negative CPL signal with a glum value of -0.005 is observed due to the circularly polarized light excitation. Interestingly, the change of the position of the foldamer film leads to an opposite CPL signal with a glum value of +0.028 because the left-handed CPL is absorbed by the foldamer film. The present investigation is crucial in deepening our understanding of the foldamer conformations and promoting the development of novel CPL materials.