Figure 2.

1/T 1 1H NMRD relaxivity data for [Gd2PCTA2(H2O)4] (top) and for [Gd2AAZTA2(H2O)4]2− (bottom) at pH=7.0: 283 K (blue squares); 298 K (black circles); 310 K (red diamonds). The solid lines represent the best results of the fitting to the experimental points (see Table 1).