A coumarin-derived fluorescent probe for detecting Cu2+
A fluorescent probe 7-hydroxy-2-oxo-N,N-bis(pyridine-2-ylmethyl)-2H-chromene-3-carboxamide(abbreviated as CE)was synthesized from 7-hydroxycoumarin-3-carboxylic acid and bis(pyridine-2-ylmethyl)amine.The structure of CE was character-ized by 1HNMR and MS.The probe showed a fluorescent"on-off'manner to coper ion(Cu2+)demonstrated by fluorescence spectros-copy.It exhibited fast response(within 1 min),good selectivity,good anti-interference,and high sensitivity(with a detection limit of 0.29 μmol·L-1).CE coordinated with Cu2+in a 1∶1 ratio,and the concentration range for Cu2+detection was 0～0.4 mmol·L-1.Furthermore,upon the introduction of disodium ethylenediaminetetraacetate(Na2EDTA),the fluorescence showed recovery,confirming the reversibility of the probe.The probe can detect Cu2+in real water samples and Baijiu with high accuracy.
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