Organic radicals stabilization above 300 °C in Eu-based coordination polymers for solar steam generation

Xinhe Ye, Lai-Hon Chung, Kedi Li, Saili Zheng, Yan-Lung Wong, Zihao Feng, Yonghe He, Dandan Chu, Zhengtao Xu (), Lin Yu and Jun He ()
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Xinhe Ye: Guangdong University of Technology
Lai-Hon Chung: Guangdong University of Technology
Kedi Li: City University of Hong Kong
Saili Zheng: Guangdong University of Technology
Yan-Lung Wong: City University of Hong Kong
Zihao Feng: Guangdong University of Technology
Yonghe He: Guangdong University of Technology
Dandan Chu: City University of Hong Kong
Zhengtao Xu: Institute of Materials Research and Engineering (IMRE), Agency of Science, Technology and Research (A*STAR), 2 Fusionopolis Way
Lin Yu: Guangdong University of Technology
Jun He: Guangdong University of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Organic radicals feature unpaired electrons, and these compounds may have applications in biomedical technology and as materials for solar energy conversion. However, unpaired electrons tend to pair up (to form chemical bonds), making radicals unstable and hampering their applications. Here we report an organic radical system that is stable even at 350 °C, surpassing the upper temperature limit (200 °C) observed for other organic radicals. The system reported herein features a sulfur-rich organic linker that facilitates the formation of the radical centers; on the solid-state level, the molecules are crystallized with Eu(III) ions to form a 3D framework featuring stacks of linker molecules. The stacking is, however, somewhat loose and allows the molecules to wiggle and transform into sulfur-stabilized radicals at higher temperatures. In addition, the resulting solid framework remains crystalline, and it is stable to water and air. Moreover, it is black and features strong broad absorption in the visible and near IR region, thereby enhancing both photothermal conversion and solar-driven water evaporation.

Date: 2022
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DOI: 10.1038/s41467-022-33948-9

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