Abstract
Abstract A highly efficient and selective rhodamine B sensor bearing triazole unit ( RHT ) as the metal ion receptor was designed and synthesized. RHT was characterized by 1 H NMR, 13 C NMR, APT, COSY, FTIR, elemental analysis, and also its binding selectivity toward various metal ions was studied. Fluorescence enhancement by factors 24 times was achieved upon selective interaction with Hg 2+ ion over other metal ions in aqueous solutions. Selective fluorescent enhancement of RHT was attributed to ring opening from the spirolactam (nonfluorescent) to ring-opened amide (fluorescent). Also, distinct color changes from colorless to pink provided “naked eye” detection of Hg 2+ .
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