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(a) UV-vis absorption spectra of the Zn(II)-HQNO2-L-Pro (1:2) system at various pH values. {cligand = 40 μM; cZn(II) = 20 μM. (b) 1H NMR spectra recorded for the same system. Peak assignation is shown in Figure S9 and * denotes the solvent peak. {cligand = 500 μM; cZn(II) = 250 μM; I = 0.10 M KCl; t = 25.0 °C; 10% (v/v) D2O/H2O}.
