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Representative calorimetric titration of 100 μm H6L with 5 mm UO2(NO3)2 ⋅6 H2O in acetonitrile (I=0.01 m NaClO4). The top figure is a thermogram of the titration that is uncorrected for dilution heats. The bottom figure shows the integrated (points) and fitted (red line) binding enthalpies (left y axis) and the distribution of H6L species [right y axis, ligand H6L (black), 1:1 uranyl H6L complex (blue), and 2:1 uranyl H6L complex (orange)] as a function of molar ratio.
