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1H NMR titration of the [Zn{DOTA-(MeAm)4}]2+ complex (CZn = CL = 3.0 × 10−2 M). The pD of the samples are as follows (from top to bottom): 12.04 (the intensity of the spectra is doubled), 11.44 (the intensity of the spectra is doubled), 10.94, 10.49, 9.84 and 6.95.
