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(a) UV-Vis absorption spectra of compound 2d at 20 °C. C(2d) = 50 μmol/L, C(DNA) = 0.0, 0.025, 0.05, 0.075, 0.1, 0.125, 0.15, 0.175, 0.2, 0.225, 0.25 μmol/L for curves 1–11 in phosphate buffer solution (pH 7.0) (b) Plot of 1/ΔA vs. 1/[DNA] for 2d-DNA.
