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Dong, Xue; Luo, Qian-Cheng; Zhao, Yu; Wang, Tao; Sun, Quanchun; Pei, Runbo; Zhao, Yue; Zheng, Yan-Zhen; Wang, Xinping
Journal of the American Chemical Society, 08/2023, Volume: 145, Issue: 31Journal Article
Polyradicals, i.e., multispin organic molecules, are playing important roles in radical-based material applications for their spin–spin interaction. A dynamic covalently bonded multispin molecule may endow materials with added function such as memory and switching. However, such a species has yet to be reported. We here report the synthesis, characterization, and crystal structure of a dynamic triradical species. It is generated by the self-assembly of two molecules through a Lewis acid coupled electron transfer. The crystalline species is spin-frustrated without Jahn–Teller distortion at low temperature, while it dissociates back to diamagnetic starting material in solution at high temperature. The reversible process is tracked by variable-temperature NMR, EPR, and UV–vis–NIR spectroscopy. Isolation, property study, and dynamic bonding investigation on such a species lay the foundation for the design of functional polyradicals with potential application as memory or switching devices.
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