A novel benzothiazole derivative (TBT) with thio and Schiff base functional groups has been prepared, and was characterized using IR, 1H NMR, elemental analysis. Furthermore, its fluorescent properties and metal ion sensing properties were evaluated. The experimental results showed that the TBT had an on-off- type fluorescence properties and selectivity of Hg^2+ at the presence of transition-and heavy-metal ion in THF aqueous solution (v:v=1:1) . The stoiehiometr...