A reversible rhodamine-based sensor (L1) capable of undergoing excimer-fluorescent resonance energy transfer (E m -FRET) was designed and synthesized using a ditopic receptor strategy. Addition of Cu 2+ ions to a solution of L1 induced a ring-open conformation of spirolactam (E m -FRET ON), whilst ring closure was induced upon addition of CH 3 COO À (E m -FRET OFF). Fig. 1 Spectral overlap between naphthyl emission (black) and ringopened rhodamine B absorption (red).
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