Figure 10.

pH-dependence of the overall rate constant k _q for the rhenium-tyrosine complex in H₂O and D₂O. The experimental data for k _q measured with 10mM phosphate buffer in H₂O (Figure 3 in Ref. 2) are depicted with open circles (○). The rate constants for the phosphate-acceptor model with 10mM phosphate buffer calculated using Eq. (13) are depicted with blue and red lines for the reaction in H₂O and D₂O, respectively. The rate constant for the reaction in H₂O or D₂O is plotted as a function of pH or pD, respectively, where the mole fraction $\chi \left({\text{HPO}}_4^{2-}\right)$ or $\chi \left({\text{DPO}}_4^{2-}\right)$ is calculated as a function of pH or pD with pKa = 7.2 or 7.8, respectively. Figure reproduced in color with permission from Ref. 88.