Polychromatic Butterfly-Shaped Thiopyrimidine-Derived Schiff Base Probe for Sequentially Detecting Trace In3+ and
Huiping Zhou1, Manman Shi1, Bingqian Li2
1School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China.
Abstract:
A polychromatic butterfly-shaped Schiff base probe DSP was designed and synthesized based on 2, 5-thiophenedicarboxaldehyde and 4-hydrazineyl-5, 6, 7, 8-tetrahydrobenzo [4, 5]thieno[2, 3-d]pyrimidine. DSP could monitor In3+ and Fe3+ sequentially, accompanied by the "yellow-orange-light green" multicolored change under the naked eye and the "off-on-off" fluorescence performance under the UV lamp in DMF/H2O = 9/1. DSP showed high sensitivity and selectivity toward In3+ and Fe3+ in the presence of other metal ions with detection limits of 42 and 68 nM, respectively. The complex stoichiometry of DSP with target ions was determined to be 1:2 via Job's plot analysis, which was further verified by ESI-MS titration and theoretical calculations. DSP has been validated as a promising tool for detecting In3+ and Fe3+ in real-world water samples. Furthermore, a DSP test strip has been successfully developed, enabling on-the-spot detection of In3+ and Fe3+.
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