首页|Metal-organic cage as fluorescent probe for LiPF6 in lithium batteries
Metal-organic cage as fluorescent probe for LiPF6 in lithium batteries
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Lithium hexafluorophosphate(LiPF6),the most commonly used lithium battery electrolyte salt,is vulnerable to heat and humidity.Quan-titative and qualitative determination the variation of LiPF6 have always relied on advanced equipment.Herein,we develop a fast,convenient,high-selective fluorescence detection method based on metal-organic cages(MOC),whose emission is enhanced by nearly 20 times in the presence of LiPF6 with good stability and photobleaching resistance.The fluorescent probe can also detect moisture in battery electrolyte.We propose and verify that the luminescence enhancement is due to the presence of hydrogen bond-induced enhanced emission effect in cages.Fluorescent excitation-emission matrix spectra and variable-temperature nuclear magnetic resonance spectroscopy are employed to clarify the role of hydrogen bonds in guest-loaded cages.Density functional theory(DFT)calculation is applied to simulate the structure of host-guest complexes and estimate the adsorption energy involved in the system.The precisely matched lock-and-key model paves a new way for designing and fabricating novel host structures,enabling specific recognition of other target compounds.
Xi Li、Dehua Xu、Aoxuan Wang、Chengxin Peng、Xingjiang Liu、Jiayan Luo
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Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin,300072,China
School of Materials Science and Engineering,University of Shanghai Science and Technology,Shanghai,200093,China
State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
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