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Series of fluorescence emission spectra upon titration of acridino-bis(allylamino)-macrocycle 15 with aqueous solutions of (A): Zn2+ (cmacrocycle = 10 μM, slit width = 5 nm), (B): Al3+ (cmacrocycle = 10 μM, slit width = 10 nm) and (C): Bi3+ (cmacrocycle = 1 μM, slit width = 7 nm) in acetonitrile (λexcitation = 249 nm, filter = 290 nm cut-off).
