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A reversible rhodamine-based sensor (L1) capable of undergoing excimer-fluorescent resonance energy transfer (Em-FRET) was designed and synthesized using a ditopic receptor strategy. Addition of Cu2+ ions to a solution of L1 induced a ring-open conformation of spirolactam (Em-FRET ON), whilst ring closure was induced upon addition of CH3COO− (Em-FRET OFF).
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Kaewtong et al. (2010) studied this question.
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