Abstract
A novel Schiff base fluorescent probe for rare earth ion Lu3+ is reported. Emission intensity of the probe is intrinsically non-fluorescent, which is due to isomerization of the C=N bond in the excited-state proton transfer (ESPT) of phenolic protons of the salicylic amide moiety. In the presence of Lu3+, fluorescence intensifies significantly due to inhibition of the C=N isomerization and ESPT. The Schiff base is characterized by high sensitivity and selectivity towards Lu3+. The fluorescence turn-on mechanism of Lu[L]2 system is proposed.
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Funding
This work was financially supported by the National Natural Science Foundation of China (21501106), the Scientific Research Foundation for the Returned Overseas Chinese Scholars and Qingdao Municipal Science and Technology Commission (16-5-1-86-jch, 19-6-2-73-cg), Chemistry Faculty Talents Foundation of Qingdao University of Science and Technology.
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Liu, X., Peng, X., Xu, F. et al. Highly Selective Schiff-Base Fluorescent Probe for Rare Earth Ion Lu3+. Russ J Gen Chem 91, 1093–1098 (2021). https://doi.org/10.1134/S1070363221060165
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DOI: https://doi.org/10.1134/S1070363221060165