Multiple hydrogen-bonding induced nonconventional red fluorescence emission in hydrogels

Jiayu Wu, Yuhuan Wang, Pan Jiang (), Xiaolong Wang (), Xin Jia and Feng Zhou
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Jiayu Wu: Chinese Academy of Sciences
Yuhuan Wang: University of Chinese Academy of Sciences
Pan Jiang: Chinese Academy of Sciences
Xiaolong Wang: Chinese Academy of Sciences
Xin Jia: Shihezi University
Feng Zhou: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The development of unconventional long-wavelength fluorescent polymer hydrogels without using polycyclic aromatic hydrocarbons or extended π-conjugation is a fundamental challenge in luminescent materials owing to a lack of understanding regarding the spatial interactions induced inherent clustering-triggered emission under water-rich conditions. Inspired by the color change of protein astaxanthin as a result of heat-induced denaturation, we propose a thermodynamically driven strategy to develop red fluorescence (~610 nm) by boiling multiple hydrogen-bonded poly(N-acryloylsemicarbazide) hydrogels in a water bath. We reveal that thermodynamically driven conformational changes of polymer chains from isolated hydrogen bonding donor-acceptor structures to through-space interaction structures induce intrinsic fluorescence shifts from blue to red during clustering-triggered emission. The proposed multiple hydrogen-bonding supramolecular hydrogel shows good fluorescence stability, mechanical robustness, and 3D printability for customizable shaping. We provide a viable method to prepare nonconventional long-wavelength fluorescent hydrogels towards soft fluorescent devices without initially introducing any fluorescent components.

Date: 2024
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DOI: 10.1038/s41467-024-47880-7

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