Study on the Performance of Th(Ⅳ)Fluorescent Probe Based on Naphthalimide-derivatized Oligarylamide
Thorium as a very important potential nuclear fuel,how to quickly and sensitively detect thorium concentration in geology,nuclear waste and environment has become a research hotspot,which is of great significance for sustainable social and economic development,reduce pollution and carbon,and affect human health.Therefore,a novel fluorescence probe(NOFP)was efficiently prepared by amidation of oligarylamide trimer diacid containing intramolecular three-center hydrogen bonding and 4-amino-1.8-naphthalimide derivative.The structure of NOFP was characterized by NMR and MS.Anti-interfer-ence and reversible properties of NOFP were studied by analyzing the fluorescence emission spectrum,the selective recogni-tion,and the coordination ratio and limit of detection of NOFP and Th4+were calculated.The results showed that NOFP exhib-ited highly selective fluorescence recognition of Th4+,resulting in a significant"turn-on"phenomenon.The fluorescence in-tensity of NOFP showed a good linear relationship with Th4+concentration(0～1.0×10-5 mol·L-1),and the limit of detection was 7.6×10-7 mol·L-1.This recognition process is not disturbed by common symbiotic metal ions(eg.La3+,Ce3+,Pr3+,Nd3+,Sm3+,Gd3+,Yb3+,Lu3+,Fe3+,Al3+,Ca2+,Mg2+),and the recognition process is reversible.Job's plot experiment calculated that the coordination ratio of NOFP and Th4+was 1∶1,and deduced the mechanism which NOFP selectively fluo-rescence recognizes Th4+.
oligaramidenaphthalimideselective recognitionfluorescence probethorium ion
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