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Experimental (black) and simulated (red) frozen solution EPR spectra recorded at various pH values for the Cu(II)-HQNO2-L-Pro system at (a) 1:1 and (b) (1:2) Cu(II):ligand ratio in 30% (v/v) DMSO/H2O. {cligand = 500 μM; cCu(II) = 500 or 250 μM; I = 0.10 M KCl; T = 77 K}.
