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(a) Effect of addition of Zn(ClO4)2 (0–10 μM) on the absorption spectrum of 6 (2.1 μM) in CH3CN. (b) Corresponding changes of the emission spectrum (λex = 370 nm). Blue: free ligand; green: ratio of [6]/[Zn2+] is 1:0.6; red: Zn2+ is in 10-fold excess relative to 6.
