Fig. 2

Structural and potentiometric studies of the H₂BHT complexation with uranyl. a Single crystal structure of UO₂(BHT) shown as a ball-stick model (U(VI), orange; O, red; N, navy blue; C, beige; H, white). b Calculated speciation as a function of pH; conditions: [U(VI)] = 0.2 mM, [H₂BHT] = 0.4 mM. c Potentiometric titration for the complexation of uranium with H₂BHT at 25 °C and I = 0.5 M (NaCl); base equivalents are with respect to ligand; observed (circles) and calculated (−) pH (right axis) with corresponding speciation (left axis); conditions: [U(VI)] = 0.362 mM, [H₂BHT] = 0.786 mM