Figure 3From: A Cu2+ion-selective fluoroionophore with dual off/on switchesIntensity ratios of the excimer (λ em = 467 nm) and monomer (λ em = 395 nm) emissions ( I ) for 1 × 10-5 M of derivative 1 in the presence of 1 × 10-5 M and 1 × 10-4 M of metal ions to those emissions ( I 0 ) without the addition of metal ions.Back to article page