Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 9, Issue 11, Pages 2568-2574Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qi00361a
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Funding
- National Natural Science Foundation of China [22001138, 22166028, 21701170]
- Jiangxi Provincial Natural Science Foundation [20202ACBL213005]
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Crystalline materials based on naphthalenediimide exhibit persistent stable radical-doped characteristics under ambient conditions, forming more ultrastable organic radicals upon exposure to visible light or heat treatment. Furthermore, these materials show significant near-infrared photothermal conversion without additional chemical modification.
Persistent stable radical-doped characteristic of naphthalenediimide-based crystalline materials under ambient conditions, even bearing 300 degrees C high temperature treatment, was studied by UV-Vis-NIR absorption spectroscopy, electron paramagnetic resonance (EPR) spectroscopy and powder X-ray diffraction (PXRD) analyses. On exposure to additional visible light or after-heat treatments, more ultrastable organic radicals can be sharply formed due to the strong and intrinsic electron transfer interactions in the crystalline materials. The significant near-infrared photothermal conversion was directly achieved in these radical-doped crystalline materials without extra chemical modification or photochemical means; furthermore, it can be effectively enhanced by further photo-induction and thermal-activation processes.
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