科研之友
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摘要
A novel multifunctional sensing material, RSPT, incorporating rhodamine B hydrazide, a Schiff base, and a phenolic hydroxyl group into triazine, was identified and prepared. After the molecular structure was characterized by FTIR, H-1 NMR, mass spectra and element analysis, it was notably found that there were multichannel turn-on fluorescent responses to Zn2+ and Bi3+, i.e., a strong fluorescence emission at 481 nm in DMF-water (99/1, v/v) for Zn2+ with a color change from colorless to light yellow-green, while an increased fluorescence emission at 580 nm in CH3CN-water (99/1, v/v) for Bi3+ with a color change from colorless to red. Their different action mechanisms for the RSPT-Zn2+ and RSPT-Bi3+ complexes were investigated and confirmed by means of fluorescent titration, binding constant, Job's plot curve, H-1 NMR titration, and theoretical simulation. RSPT would be a promising turn-on fluorescent chemo-dosimeter for multichannel detection of Zn2+ and Bi3+ with a detection limit of 3.0 nM for Zn2+ and 8.6 nM for Bi3+.
