Highly Selective Schiff-Base Fluorescent Probe for Rare Earth Ion Lu3+
2021
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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