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(a) UV/Vis absorption spectra recorded for copper(II) complex of [H2LH]Cl (1) at various pH values, and (b) its concentration distribution curves plotted together with the absorbance changes at 330 (×) and 370 nm (●) (ccomplex = 50 μM; I = 0.1 M (KCl); t = 25 °C).
