Abstract
A new rhodamine-based fluorescent chemosensor ( 1) for transition metal cations was synthesized by one-step facile condensation of rhodamine B and 2-aminopyridine. Without metal cations, 1 is colorless and nonfluorescent, whereas addition of metal cations (Fe 3+, Hg 2+, Pb 2+, and Fe 2+) leads to an obvious color change to pink and an appearance of orange fluorescence.
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