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(a) Longitudinal proton relaxivity of Gd-DOTA-L6-(2Nal)2 measured at 21.5 MHz (0.5 T) and 298 K as a function of the concentration of the Gd-complex. (b) NMRD profiles of Gd-DOTA-L6-(2Nal)2 (1.0 mg/mL (●) and 25.0 mg/mL (○)) compared to those of Gd-DOTA-L6-F2 (1.0 mg/mL (■) and 25.0 mg/mL (□)). Experimental data points were measured on aqueous solutions of the Gd-complexes at 298 K. The data refer to 1 mM concentration of the paramagnetic complexes.
